basic electrical questions

 Q:electromotive force formula

Answer:The main electromotive force (EMF) formulas are ε = E/Q and ε = V + Ir, where ε (or EMF) is the electromotive force, E is the energy, Q is the charge, V is the terminal voltage, I is the current, and r is the internal resistance of the source. The first formula, ε = E/Q, defines EMF as the energy provided per unit charge, while the second formula, ε = V + Ir, relates EMF to the terminal voltage (V) in a closed circuit.

electrical

Q: What is the role of a diode in an electrical circuit?

 

Answer:diode is a semiconductor device that allows current to flow in one direction only. It acts as a one-way valve, permitting the passage of electric current when the voltage across it is in the forward direction.Diodes are crucial in rectification, signal demodulation, and electronic protection.

Q:Describe a capacitor and its uses.

Answer:capacitor is a passive electrical component with two terminals that store energy in an electric field. It is used in various applications like filtering, power conditioning, signal processing, and energy storage. Capacitors are essential in creating resonant circuits in radios and tuning devices..

Q:What is a three-phase electrical system?

Answer:three-phase electrical system is a polyphase system used primarily for power transmission and generation. It consists of three alternating currents of the same frequency and voltage amplitude, with a phase difference of one-third of a cycle (120 degrees). This system is more efficient and economical for large power distribution.

Q:Explain the concept of the power factor.

Answer:The power factor measures how effectively electrical power is converted into useful work output. It is defined as the ratio of the real power (used to do work) to the apparent power (total power within the circuit). A higher power factor signifies efficient power usage.

Q:Explain the difference between AC and DC currents.

Answer:AC (Alternating Current) and DC (Direct Current) are two types of electrical current. AC changes direction periodically, while DC flows in one constant direction. AC is commonly used in power supply systems due to its ease of transformation into different voltages, whereas DC is often used in battery-powered or electronic devices.

Q:Define Kirchhoff’s laws.

Answer:Kirchhoff’s laws consist of two rules essential in circuit analysis. Kirchhoff's Current Law (KCL) states that the total current entering a junction equals the total current leaving it. Kirchhoff's Voltage Law (KVL) says that the sum of all electrical voltages around a loop is zero

Q:What are the types of electrical circuits?

Answer:Electrical circuits can be classified into series, parallel, and series-parallel circuits. In a series circuit, components are connected end-to-end, so the same current flows through each component. In a parallel circuit, components are connected across the same voltage source, so the voltage is the same across each component. Series-parallel circuits combine elements of both.

Q:What is Ohm’s Law?

Answer:Ohm's Law is a fundamental principle in electrical engineering, stating that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, provided the temperature remains constant. The formula is I = V/R, where I is the current, V is the voltage, and R is the resistance.

Q:What is a Transformer?

Answer:transformer transfers electrical energy between circuits using electromagnetic induction.

Q:What is electric power?

Answer:electric Power is the rate at which electrical energy is transferred by an electric circuit, measured in watts (W)

Q:What is a resistance?

Answer:Resistance is the opposition to the flow of electric current, measured in ohms (Ω)

Q:Hi?

Answer:i am your electrical Assistant ask any questions

Q:Discuss the differences between a fuse and a circuit breaker.

Answer: Both fuses and circuit breakers are protective devices that prevent overcurrent in electrical circuits. A fuse is a one-time-use device that melts and breaks the circuit when excessive current flows through it. On the other hand, a circuit breaker can be reset after tripping due to overcurrent.

Q:What is an inverter, and how does it work?

Answer: An inverter is an electronic device that converts direct current (DC) to alternating current (AC). It uses a switching circuit that rapidly switches the DC input on and off, creating a square wave. This wave is then modified into a sine wave, which is more suitable for household appliances and other devices.

Q:How do transformers work, and what are their types?

Answer: Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction. They work on the principle of Faraday's Law of Electromagnetic Induction. Transformers are mainly of two types: step-up (which increases voltage) and step-down (which decreases voltage).

Q:What is the significance of a synchronous generator in power systems?

Answer: A synchronous generator, or alternator, is crucial in power generation. It produces alternating current synchronised with the grid frequency. Its synchronous operation ensures stable and coordinated power delivery, making it a key component in large-scale power plants and grid-connected systems.

Q:Elaborate on the concept of the electrical skin effect.

Answer: Electrical skin effect refers to the tendency of alternating current to concentrate near the surface of a conductor, particularly at higher frequencies. This phenomenon results in increased effective resistance, impacting the current distribution within the conductor. Engineers must consider the skin effect in designing high-frequency electrical systems.

Q:What is the role of a semiconductor in power electronics?

Answer: Semiconductors play a pivotal role in power electronics by controlling the flow of electrical power. Devices like power diodes, transistors, and thyristors enable efficient conversion, control, and regulation of electrical energy in applications such as inverters, converters, and motor drives. They contribute to advancements in energy efficiency and electronic control systems.

Q:What is a diode 

Answer:A diode is an electronic component with two terminals, an anode and a cathode, that acts as a one-way street for electricity, allowing current to flow in only one direction (from anode to cathode)

Q:what is a capacitor

Answer:A capacitor is an electronic device that stores electrical energy in an electric field, consisting of two conductive plates separated by an insulating material called a dielectric. Its ability to store charge is measured by capacitance, with the unit of farads (F). Unlike batteries, capacitors store energy in a field rather than chemically and release it much faster, making them essential for filtering, smoothing voltage changes, and other circuit functions.

Q:what is an inductor

Answer:An inductor is a passive electrical component, often called a coil or choke, that stores energy in a magnetic field when an electric current flows through its wire coil. It resists changes in current, allowing a steady direct current (DC) to pass but impeding alternating current (AC). Inductors are characterized by their inductance, measured in Henrys (H), and are used in various applications, including filters, transformers, and sensors.

Q:what is a transistor

Answer:A transistor is a semiconductor device that can amplify or switch electronic signals and electrical power. It's a fundamental building block in modern electronics, acting as a tiny electronic switch or an amplifier. Essentially, it controls the flow of current between two terminals based on the voltage applied to a third terminal. 

Q:state and explain superposition theorem

Answer:The superposition theorem states that in any linear, bilateral circuit with multiple independent sources, the total response (voltage or current) in any element is the algebraic sum of the responses due to each source acting alone. To apply the theorem, each independent source is considered one at a time, while all other independent sources are deactivated by replacing voltage sources with a short circuit and current sources with an open circuit. The individual responses are then summed algebraically to find the total response for the original circuit.

Q:explain the construction and working of lead acid battery

Answer:A lead-acid battery consists of positive plates of lead dioxide (PbO2) and negative plates of sponge lead (Pb), immersed in a sulfuric acid (H2SO4) electrolyte. In the working process, the chemical reaction between the lead plates and the sulfuric acid produces electricity during discharge, converting both plates to lead sulfate (PbSO4). During charging, an external electrical current reverses this process, converting the lead sulfate back into lead dioxide and sponge lead.

Q:define power factor and disadvantages of low power factor

Answer:Power factor is the ratio of real power (the power that actually does work) to apparent power (the total power supplied) in an AC electrical system. A low power factor means that much of the supplied power is wasted, leading to disadvantages such as higher electricity costs, increased losses in the system due to higher current, the need for larger and more expensive equipment, and poor voltage regulation; ;

Q:faraday's law of electromagnetic induction

Answer:Faraday's Law of Electromagnetic Induction states that a changing magnetic flux through a closed loop induces an electromotive force (EMF), or voltage, in that loop. The magnitude of this induced EMF is directly proportional to the rate of this change in magnetic flux, which can be caused by moving a magnet, changing the coil's area in a magnetic field, or rotating the coil. This phenomenon is the basis for many technologies, including transformers, generators, and electric motors.

Q:What are the advantages of electrical energy?

Answer:Electrical energy is advantageous because it is easy to transport, versatile, and can be converted into other forms of energy like light, heat, and mechanical motion. It also allows for automation and control of systems, offers high efficiency, and can be generated from various sustainable and non-sustainable sources. Additionally, it improves indoor air quality, reduces noise pollution, and enables modern communication and technology, enhancing productivity and quality of life.

Q:Define resistance and what are the factors affecting the resistance of conductor.

Answer:Electrical energy is advantageous because it is easy to transport, versatile, and can be converted into other forms of energy like light, heat, and mechanical motion. It also allows for automation and control of systems, offers high efficiency, and can be generated from various sustainable and non-sustainable sources. Additionally, it improves indoor air quality, reduces noise pollution, and enables modern communication and technology, enhancing productivity and quality of life.

Q:state and explain kirchhoff's laws

Answer:Kirchhoff's laws consist of the Current Law (KCL) and the Voltage Law (KVL), which are fundamental to analyzing electric circuits. KCL states that the total current entering a junction equals the total current leaving it, based on the conservation of charge. KVL states that the sum of voltage drops around any closed loop in a circuit is zero, based on the conservation of energy. 

Q:explain fleming's right hand rule

Answer:Fleming's Right-Hand Rule determines the direction of the induced current in a conductor that is moving in a magnetic field. To use it, extend your right thumb, forefinger, and middle finger mutually at right angles. If the thumb points in the direction of the conductor's motion and the forefinger points in the direction of the magnetic field, then the middle finger indicates the direction of the induced current.

Q:write the comparison between electric and magnetic circuits

Answer:Electric circuits provide a path for electric current, driven by electromotive force (EMF) and opposed by resistance, while magnetic circuits provide a path for magnetic flux, driven by magnetomotive force (MMF) and opposed by reluctance. Key differences include the continuous energy requirement for maintaining current flow versus the initial energy needed for static flux, the physical carriers (free electrons versus aligned molecular poles), and the existence of a perfect insulator for electric circuits, which magnetic circuits lack

Q:what is voltage

Answer:Voltage is the measure of electric potential difference between two points in an electrical circuit. It represents the "push" or pressure that drives electric current through a circuit. Think of it like water pressure in a pipe; the higher the pressure, the more water can flow. 

Q:what is current

Answer:A current is the flow of electric charge, typically electrons, through a conductor.This flow is caused by a potential difference,or voltage, and is measured in amperes (A), with a higher current meaning more electricity is flowing. Think of it like water flowing in a river: the voltage is the force pushing the water, and the resistance of the riverbed affects the flow.

Q:what is emf

Answer:EMF, or Electromotive Force, is the electrical energy supplied by a source (like a battery or generator) per unit charge to push charges through a circuit, measured in volts (V). It represents the potential for a source to move charge, fundamentally understanding how devices convert one form of energy into another to create electrical energy. 

Junior Instructor (Wireman)

 

 

Question Paper Code:                    4/2019/OL

Category Code:                             593/2017

Exam:                                          Junior Instructor (Wireman)

Medium of Question:                      English

Date of Test                                   06-03-2019

Department                                  Industrial Training

Alphacode                                    A

Question1:-How many women members were there in the Indian Constituent Assembly?

A:-12

B:-15

C:-18

D:-19

Correct Answer:- Option-B

Question2:-Who among the following was a martyr in Paliyam Satyagraha?

A:-A.G. Velayudhan

B:-T.K. Narayana Pillai

C:-R.K. Shanmukhan Chetti D:-Kalkulam Govindan Correct Answer:- Option-A

QuQuestion3:-The capital of       Venezuela is 

B:-Buenos Aires C:-Lima

D:-Caracas

Correct Answer:- Option-D

Question4:-Who is the author of the Malayalam Drama "Ningalenne Communistakki"?

A:-K. Damodaran B:-N.N. Pillai

C:-Thoppil Bhasi

D:-V.T. Bhattatirippad Correct Answer:- Option-C

Question5:-Who gave the name "Brahmananda Sivayogi" to Karat Govindankutty Menon?

A:-Chengalath Kunhirama Menon B:-Dr. Ayyathan Gopalan

C:-Manjeri Rama Iyyer

D:-Puliyampatta Kunhikrisha Menon Correct Answer:- Option-B

Question6:-Which Article of the Indian Constitution ensures Freedom of Press in India?

A:-Article 17

B:-Article 21

C:-Article 29

D:-Article 19

Correct Answer:- Option-D

Question7:-"Pottiya Ezhakal", a collection of Malayalam stories is of               .

A:-Malayattoor Ramakrishnan B:-M.B. Bhattatirippad

C:-Ponkunnam Varkey D:-Balamaniyamma

Correct Answer:- Option-C

Question8:-Name the President of the People's Republic of China.

A:-Xi Jinping B:-Wei Fenghe

C:-Pham Binh Minh

D:-Nguyen Xuan Phuc Correct Answer:- Option-A

Question9:-In which case did the Supreme Court hold that the Preamble is not the part of the Constitution of India?

A:-Kesavananda Bharati State of Kerala, 1973 B:-The Berubari Union Case, 1961

C:-Indira Gandhi vs. Raj Narain, 1975 D:-Mc Mehta v. Union of India, 1986 Correct Answer:- Option-B

Question10:-Who among the following was not the leading activist of the PRDS founded by Poikayil Yohannan?

A:-Simon Yohannan

B:-Vellikkara Mathai Upadeshi C:-Kalayil Pathrose Mooppan D:-Kocheeppan Tharakan Correct Answer:- Option-D

Question11:-The "Hindu Pulaya Samajam" was founded in 1917 by              .

A:-Pandit K.P. Karuppan B:-Mahatma Ayyankali C:-Karumban Daivathan D:-Vellikkara Chothi

Correct Answer:- Option-C

Question12:-The political party of Imran Khan that came to Pakistan in August 2018 is               .

A:-Tehreek-al-Islam

B:-Hizb-e-Refah e Insaf C:-Tehreek-e-Insaf

D:-Hezb-e-Congra-e Pakistan Correct Answer:- Option-C

Question13:-The editor of the "Mithavadi" who campaigned against untouchability was              .

A:-C. Krishnan B:-K. Ayyappan C:-A.R. Menon

D:-E. Ikkanda Warrier Correct Answer:- Option-A

Question14:-As per the Constitution of India which right cannot be taken away during Emergency?

A:-Right against exploitation B:-Right to personal liberty

C:-Right to freedom of religion D:-Right to equality

Correct Answer:- Option-B

Question15:-The socio-religious reformer of Kerala who exhorted the workers not to work without wages was                .

A:-Sree Narayana Guru B:-Chattampi Swamikal C:-Vagbhatananda

D:-Vaikunda Swamikal Correct Answer:- Option-D

Question16:-The social reformer known as "Vaikom Veeran" was A:-Mannath Padmanabhan

B:-K. Kelappan

C:-E.V. Ramaswamy Naikar D:-A.K. Gopalan

Correct Answer:- Option-C

Question17:-The Diwan of Travancore who issued an order permitting Channar women who became converts to Christianity to cover their bodies with jackets was

A:-Col. Munro

B:-Muhammad Habibullah C:-C.P. Ramaswami Iyer D:-M.E. Watts

Correct Answer:- Option-A

Question18:-The constitutional principle of the basic structure was invented by the             .

A:-Legislature B:-Judiciary

C:-President of India D:-Executive

Correct Answer:- Option-B

Question19:-Which book is considered as the "Bible of Ayyavazhi"?

A:-Vedadikara Nirupanam B:-Mokshapradeepam

C:-Narayana Pandaram

D:-Akhilathiruttu Ammanai Correct Answer:- Option-D

Question20:-The captain of the Volunteer Corps of the Guruvayur Satyagraha was A:-P. Krishna Pillai

B:-K. Kelappan C:-A.K. Gopalan

D:-M.C. Janardhana Pillai Correct Answer:- Option-C

Question21:-How is an ammeter connected in a circuit?

A:-Parallel B:-Series

C:-Series - parallel D:-None of these

Correct Answer:- Option-B Question22:-BOT unit is             

A:-Joule

B:-Newton C:-KWh

D:-Watt

Correct Answer:- Option-C

Question23:-The temp. resistance coefficient is represented in the form of A:-ohm/ohm

B:-ohm/°c

C:-ohm/ohm/°c D:-None of these

Correct Answer:- Option-C Question24:-Ohm is the unit of

A:-Resistance

B:-Capacitive reactance C:-Inductive reactance D:-All of the above

Correct Answer:- Option-D

Question25:-3 resistors are connected in series across a 27V supply. The second resistor has twice the resistance of the first. The third one has three times the resistance of the second. Find the voltage across the third resistance

A:-3V

B:-6V

C:-9V

D:-18V

Correct Answer:- Option-D

Question26:-A safety sign circular in shape, white symbol on blue background is a A:-Prohibition sign

B:-Mandatory sign C:-Warning sign

D:-Information sign Correct Answer:- Option-B

Question27:-Respiratory protective equipment comes under A:-PPE 3

B:-PPE6 C:-PPE1 D:-PPE7

Correct Answer:- Option-A

Question28:-Gas and liquefiable gases come under              class of fire.

A:-Class D B:-Class C

C:-Class B D:-Class A

Correct Answer:- Option-B

Question29:-The saw used for cutting thin wooden accessories like wooden batten round blocks casing capping etc. is A:-Handsaw

B:-Hacksaw C:-Tenon saw

D:-None of these

Correct Answer:- Option-C

Question30:-The curved part of a file separating the tang from body is A:-Face

B:-Edge C:-Tang

D:-Shoulder

Correct Answer:- Option-D

Question31:-The angle of punch which is used for witness marks is A:-60°

B:-30°

C:-45°

D:-90°

Correct Answer:- Option-A

Question32:-Arc heating occurs when the air between electrodes of opposite polarities become A:-moistened

B:-dry

C:-ionised

D:-none of the above Correct Answer:- Option-C

Question33:-             calipers are used for marking and layout works.

A:-Jenny calipers B:-Outside calipers C:-Inside calipers

D:-Firm joint calipers Correct Answer:- Option-A

Question34:-EPROM stands for

A:-Electrically Programmable Read Only Memory B:-Erasable Programmable Read Only Memory

C:-Electrically Programmable Random Only Memory D:-Erasable Processors Read Only Memory

Correct Answer:- Option-B

Question35:-A wire measuring 1mm diameter has a cross sectional area of             A:-`1 mm^2`

B:-`1 cm^2`

C:-`0.78 mm^2` D:-`0.87 mm^2`

Correct Answer:- Option-C

Question36:-The torque producing movement of the pointer in an indicating instrument is A:-deflecting

B:-controlling C:-distracting D:-damping

Correct Answer:- Option-A

Question37:-In an instrument the pointer comes slowly to its final deflected position if the instrument is               damped.

A:-not B:-over

C:-critically D:-under

Correct Answer:- Option-B

Question38:-An electrical circuit that has infinity resistance is called                circuit.

A:-an open

B:-a short C:-a ground

D:-either (2) or (3) Correct Answer:- Option-A

Question39:-No. of light points admissible in one circuit are A:-4 points of 400w each

B:-4 points of 600w each C:-8 points of 100w each D:-8 points of 200w each Correct Answer:- Option-C

Question40:-No. of screws to be used for fixing a round block A:-1 No

B:-2 Nos C:-3 Nos D:-4 Nos

Correct Answer:- Option-B

Question41:-In this wiring, to operate 3 lamps in all we require 6 two-way switches is A:-Godown wiring

B:-Tunnel wiring C:-Hostel wiring D:-Corridor wiring

Correct Answer:- Option-D

Question42:-Size of copper plate electrode for plate earthing is A:-60×60 cm×6.3 mm

B:-60×60 cm×3.15 mm C:-30×30 cm×6.3 mm D:-30×30 cm×3.15 mm

Correct Answer:- Option-B Question43:-The unit of luminous flux is

A:-lumen

B:-candle power C:-lux

D:-meter candle

Correct Answer:- Option-A

Question44:-To increase the range of an ammeter            is used.

A:-C.T.

B:-multiplier C:-shunt

D:-P.T.

Correct Answer:- Option-C Question45:-Extension of MS Word file is

A:-.doc

B:-.xls

C:-.text

D:-.ppt

Correct Answer:- Option-A

Question46:-Which one of the following is a basic unit of MS Excel?

A:-Row

B:-Column C:-Cell

D:-Word

Correct Answer:- Option-C

Question47:-Isolation of fire from the supply of oxygen by blanketing it with foam, sand etc. comes under which fire extinguishing method

A:-Starving

B:-Smothering C:-Cooling

D:-Blanketing

Correct Answer:- Option-B

Question48:-Edison screw type lamp holders are used for lamp with             wattage range.

A:-above 600 w

B:-upto 200 w

C:-above 200 w below 600 w

D:-above 200 w below 300 w Correct Answer:- Option-D

Question49:-To increase the ampere hour rating, the cells are to be connected in A:-parallel

B:-series parallel C:-parallel series D:-series

Correct Answer:- Option-A

Question50:-"Don't try to stop a running machine with hands" comes under A:-General safety

B:-Personal safety C:-Machine safety D:-Social safety

Correct Answer:- Option-B

Question51:-The ripple factor of a power supply is a measure of A:-Its voltage regulation

B:-Diode rating

C:-Its filter efficiency

D:-Purity of power output Correct Answer:- Option-D

Question52:-The function of a commutator in a DC generator is A:-To change DC to AC

B:-To collect current from conductors C:-To change AC to DC

D:-To conduct the current to the brushes Correct Answer:- Option-C

Question53:-The field coils of a DC generator are usually made of A:-Carbon

B:-Copper C:-Cast iron D:-Graphite

Correct Answer:- Option-B

Question54:-In a two point starters the series resistors is required for A:-To limit the starting current

B:-Starting the motor

C:-To limit the back emf

D:-To give heavy current at starting Correct Answer:- Option-A

Question55:-In two watt meter method of measuring three phase power one of the wattmeter shows zero reading what would be the value of the power factor in this case

A:-1 B:-0.5

C:-zero D:-1.5

Correct Answer:- Option-B

Question56:-Rotor of an induction motor runs always A:-At synchronous speed

B:-At more than synchronous speed C:-At less than synchronous speed D:-In opposite direction to the field Correct Answer:- Option-C

Question57:-The difference between the synchronous speed and the actual rotor speed is called A:-Fractional slip

B:-Slip speed C:-Rotor speed

D:-Actual rotor speed Correct Answer:- Option-B

Question58:-The slip of an induction motor will be low when A:-Rotor Resistance is low

B:-Friction loss is low C:-Windage loss is low

D:-Rotor resistance is high Correct Answer:- Option-A

Question59:-The split rings are made of A:-Brass

B:-Gunmetal C:-Bronze

D:-Hard drawn copper Correct Answer:- Option-D

Question60:-Which motor should not be started on no load?

A:-Shunt motor

B:-Cumulative compound motor C:-Series motor

D:-Differential compound motors Correct Answer:- Option-C

Question61:-The barrier potential for a silicon PN junction is         V. A:-0.3 V

B:-0.7 V

C:-0.2 V

D:-0.5 V

Correct Answer:- Option-B

Question62:-In which DC generator the armature and field current will be equal?

A:-Shunt

B:-Long shunt compound C:-Short shunt compound D:-Series

Correct Answer:- Option-D

Question63:-Which type of starter used to start both shunt and compound DC motor?

A:-Three pointer starter B:-Two point starter

C:-DOL starter

D:-Star-delta starter Correct Answer:- Option-A

Question64:-When the speed of alternator increases the frequency?

A:-Decreases B:-Increases

C:-Remains same

D:-None of the above Correct Answer:- Option-B

Question65:-Alternators are rated in A:-KW

B:-KWH

C:-KVA

D:-Full load current Correct Answer:- Option-C

Question66:-Most widely used transformer oil is A:-Animal oil

B:-Cooking oil C:-Vegetable oil D:-Mineral oil

Correct Answer:- Option-D

Question67:-The line insulators are made up to A:-Mica

B:-Porcelain clay

C:-Asbestos D:-Ceramic

Correct Answer:- Option-B

Question68:-Epoxy compound used with underground cable does not need A:-Heating

B:-Armouring C:-Insulation D:-Core

Correct Answer:- Option-A

Question69:-The chemical used in breather is A:-Copper sulphate

B:-Sodium chloride C:-Silica gel

D:-Potassium chloride Correct Answer:- Option-C

Question70:-Graphite is used in nuclear power plant as a A:-Fuel

B:-Coolant C:-Electrode

D:-Moderator

Correct Answer:- Option-D

Question71:-Which of the following power plants is free from environmental problems?

A:-Diesel engine

B:-Nuclear power plant

C:-Hydro electric power plant D:-Steam power plant Correct Answer:- Option-C

Question72:-Which type of insulator is used in stay wire?

A:-Egg type B:-Pin type

C:-Shackle type

D:-Suspension type Correct Answer:- Option-A

Question73:-Which of the following power plant has the maximum capital cost?

A:-Steam power plant B:-Nuclear power plant

C:-Hydro electric power plant D:-Diesel power plant Correct Answer:- Option-B

Question74:-The working principle of a transformer is A:-Static induction

B:-Self induction

C:-Mutual induction D:-None of the above

Correct Answer:- Option-C

Question75:-The colour of neutral wire of a cable is A:-Red

B:-Yellow C:-Orange D:-Black

Correct Answer:- Option-D

Question76:-The amount of matter in a body is called A:-mass

B:-weight C:-density

D:-none of these

Correct Answer:- Option-A

Question77:-The rate of change of position in a particular direction is called A:-speed

B:-velocity

C:-acceleration D:-none of these

Correct Answer:- Option-B Question78:-The volume of a hemisphere is

A:-`(4)/(3) pi r^3`

B:-`(3)/(3) pi r^3`

C:-`(2)/(3) pi r^3`

D:-`(1)/(3) pi r^3`

Correct Answer:- Option-C Question79:-Perimeter of a circle is

A:-1`pi r` B:-2 `pi r` C:-3 `pi r` D:-4`pi r`

Correct Answer:- Option-B Question80:-One gallon is

A:-1.546 litres B:-2.546 litres C:-3.546 litres D:-4.546 litres

Correct Answer:- Option-D Question81:-60 Km/hr into m/sec is

A:-10.66 m/sec B:-12.66 m/sec C:-14.66 m/sec D:-16.66 m/sec

Correct Answer:- Option-D

Question82:-The property of material to be drawn into thin sheets without fracture is A:-Ductility

B:-Malleability C:-Machinability

D:-None of these

Correct Answer:- Option-B

Question83:-The multiplication 0.1 × 0.001 is equal to A:-0.1

B:-0.01

C:-0.001

D:-0.0001

Correct Answer:- Option-D

Question84:-Multiply 6/13 by the reciprocal of 9/16 is equal to A:-96/117

B:-32/39 C:-54/208

D:-None of these

Correct Answer:- Option-B Question85:-`(3ab)^2` is equal to

A:-`3a^2b^2` B:-`9a^2b^2` C:-`3ab^2`

D:-None of these

Correct Answer:- Option-B

Question86:-One radian measure is equal to A:-`(90^@)/(pi)`

B:-`(180^@)/(pi)`

C:-`(270^@)/(pi)`

D:-`(360^@)/(pi)`

Correct Answer:- Option-B Question87:-Sin`theta` is equal to

A:-Opposite side / adjecent side B:-Adjecent side / hypotenus

C:-Opposite side / hypotenus D:-None of these

Correct Answer:- Option-C

Question88:-The value of 1/tan45 is equal to A:-0

B:-1

C:-45 D:-1/45

Correct Answer:- Option-B

Question89:-The value of `"sin^2"` 60+`"cos^2"` `` 60 is equal to A:-0

B:-1

C:-1/2

D:-2/3

Correct Answer:- Option-B Question90:-Heat is a form of

A:-Work B:-Power C:-Energy

D:-None of these

Correct Answer:- Option-C

Question91:-Conventional representation of 1st angle and 3rd angle projection includes A:-Two eccentric circles

B:-Two concentric circles

C:-Two circle of same diameter D:-None of these

Correct Answer:- Option-B

Question92:-700×500×15 mm drawing board designated by A:-`"D_0"`

B:-`"D_1"`

C:-`"D_2"`

D:-`"D_3"`

Correct Answer:- Option-C

Question93:-594×841 trimmed size of drawing sheet designated by A:-`"A_0"`

B:-`"A_1"`

C:-`"A_2"`

D:-`"A_3"`

Correct Answer:- Option-B

Question94:-In 3rd angle projection the Top view (plan) is drawing A:-Right side of elevation

B:-Left side of elevation C:-Below the elevation D:-Above the elevation

Correct Answer:- Option-D

Question95:-In 1st angle projection the end view from right side of an object is drawing A:-Right side of elevation

B:-Left side of elevation C:-Right side of plan

D:-Left side of plan Correct Answer:- Option-B

Question96:-The symbol                     represent A:-A.C. Motor

B:-D.C. Motor

C:-A.C. Generator D:-D.C. Generator

Correct Answer:- Option-B

Question97:-The angle of isometric axis is A:-270°

B:-120° C:-360° D:-130°

Correct Answer:- Option-B Question98:-The number of a pentagon is

A:-3

B:-4

C:-5

D:-6

Correct Answer:- Option-C

Question99:-The isometric view of a circle is A:-Parabola

B:-Ellipse C:-Triangle

D:-Rectangle

Correct Answer:- Option-B Question100:-The length of an arrow head is

A:-Same as width

B:-Two times of width C:-Three times of width D:-Four times of width

Correct Answer:- Option-C