ITI Electrician Mock Test - Semester 4 - Mock Test

Module 5 – Power Generation and Substation
Module 6 – Transmission and Distribution
Module 7 – Circuit Breakers and Relays

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Created on August 12, 2022
Electrician

ITI Electrician Mock Test - Semester 4

Semester : 4
Module 5 - Power Generation and Substation
Module 6 - Transmission and Distribution
Module 7 - Circuit Breakers and Relays

1 / 78

Category: Electrician 4 sem Module 5

What is the function of penstocks in hydro power stations?

A) Carries water to dam

B) Carries water to turbines

C) Carries water away from power house

D) Discharges surplus water from reservoir

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Category: Electrician 4 sem Module 5

What is the effect of radio active rays produced during nuclear fission?

A) Damages the reactors

B) Creates health hazards

C) Reduces fission process

D) Enormous heat is produced

3 / 78

Category: Electrician 4 sem Module 5

Which is a non-conventional energy source?

A) Lignite

B) Sun rays

C) Stored water

D) Pulverized coal

4 / 78

Category: Electrician 4 sem Module 5

Which material is used as control rod in a nuclear reactor?

A) Thorium

B) Graphite

C) Cadmium

D) Tungsten

5 / 78

Category: Electrician 4 sem Module 5

Which is the purpose of boiler in a steam power station?

A) Super heats the steam

B) Heats feed water and air

C) Converts water in to steam

D) Liberates the heat from burnt fuel

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Category: Electrician 4 sem Module 5

What is the main disadvantage of non-conventional power generation?

A) Poor efficiency

B) No constant generation

C) Can use only light loads

D) Heavy load cannot be operated

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Category: Electrician 4 sem Module 7

How the rupturing capacity of circuit breaker is rated?

A) KV

B) KW

C) MVA

D) KVAR

8 / 78

Category: Electrician 4 sem Module 7

Which type of load is protected by ‘G’ series MCB?

A) Ovens

B) Geysers

C) Air conditioners

D) General lighting systems

9 / 78

Category: Electrician 4 sem Module 7

What is the effect, if the test button marked as ‘X’ is closed permanently in ELCB?

A) Circuit trips intermittently

B) Circuit functions normally

C) Circuit switch off completely

D) Circuit will not trip on leakage

10 / 78

Category: Electrician 4 sem Module 7

Which type of relay is used in both A.C and
D.C supply?

A) Reed relay

B) Impulse relay

C) Thermal relay

D) Clapper-type armature relay

11 / 78

Category: Electrician 4 sem Module 6

What will happen to the skin effect on the
O.H conductors, if the conductor diameter is small (<1cm)?

A) Becomes negligible

B) Increases to maximum

C) No effect, remain same

D) Decreases half of the value

12 / 78

Category: Electrician 4 sem Module 5

What is the name of the material used for making photovoltaic cell?

A) Silicon

B) Arsenic

C) Antimony

D) Germanium

13 / 78

Category: Electrician 4 sem Module 5

Which is the disadvantage of non conventional power generation over conventional power generation?

A) Increase pollution

B) Security risk is more

C) Requires more maintenance

D) Cannot be used for base load demand

14 / 78

Category: Electrician 4 sem Module 5

What is the advantage of pressurized water reactor (PWR)?

A) No heat loss

B) High thermal efficiency

C) It has high power density

D) Metal surface temperature is lower

15 / 78

Category: Electrician 4 sem Module 5

What is the advantage of non-conventional energy source?

A) More reliable

B) Low initial cost

C) Efficiency is high

D) Green house effect is avoided

16 / 78

Category: Electrician 4 sem Module 6

What is the insulation resistance between any two conductors in a medium voltage domestic installation as per IE rules?

A) Infinity

B) More than one Mega ohm

C) More than two Mega ohms

D) More than three Mega ohms

17 / 78

Category: Electrician 4 sem Module 5

Which power generation requires heavy water treatment plant?

A) Hydel power generation

B) Diesel power generation

C) Thermal power generation

D) Nuclear power generation

18 / 78

Category: Electrician 4 sem Module 5

Which component in a steam power plant is used to heat the feed water from the flue gas?

A) Boiler

B) Economizer

C) Super heater

D) Air pre heater

19 / 78

Category: Electrician 4 sem Module 5

What happens to solar cell, if the intensity of light is low?

A) Output increases

B) Output decreases

C) Output remain same

D) No output in the cell

20 / 78

Category: Electrician 4 sem Module 5

What is the purpose of barrage in tidal power station?

A) Controls the tidal waves

B) Releases water towards the sea

C) Tap the water at the entrance of gulf

D) Converts potential energy into kinetic energy

21 / 78

Category: Electrician 4 sem Module 6

Why steel is reinforced in ACSR conductors used for over head lines?

A) To minimize the line sag

B) To reduce the line voltage drop

C) To increase the tensile strength

D) To increase the current carrying capacity

22 / 78

Category: Electrician 4 sem Module 6

What is the type of over head line joint?

A) Twisted joint

B) Straight sleeve joint

C) Compression joint for ACSR

D) Straight joint through connectors

23 / 78

Category: Electrician 4 sem Module 5

What is the output voltage of a solar cell, if light intensity is high?

A) No output in the cell

B) Output voltage is increased

C) No effect and remain same

D) Output voltage is decreased

24 / 78

Category: Electrician 4 sem Module 7

What is the function of Buchholz relay in power transformer?

A) Over load and short circuit protection

B) Over voltage and earth fault protection

C) Open circuit and earth fault protection

D) Open circuit and over voltage protection

25 / 78

Category: Electrician 4 sem Module 6

Which electric lines connect the substation to distributors in distribution system?

A) Feeders

B) Distributors

C) Service lines

D) Service mains

26 / 78

Category: Electrician 4 sem Module 5

Which is the residue of bio-mass?

A) Slurry

B) Bio fuel

C) Manure

D) Bio gas

27 / 78

Category: Electrician 4 sem Module 6

Why the disc pin insulators outer surface is made by glazing and bent the sides inward?

A) To withstand high voltage

B) Not to attract birds to sit on it

C) To offer high mechanical strength

D) Disables continuous water flow in rainy season

28 / 78

Category: Electrician 4 sem Module 7

What is the cause for the defect if phase to ground fault on the transmission line?

A) Components failure

B) Insulation failure

C) Human error

D) Fuse failure

29 / 78

Category: Electrician 4 sem Module 5

What is the function of turbine used in tidal power generation?

A) Prevents water flow to other parts of dam

B) Converts potential energy into kinetic energy

C) Keeps the water flow from low to higher level

D) Converts kinetic energy into potential energy

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Category: Electrician 4 sem Module 5

What is the main disadvantage of nuclear plant?

A) Disposal of waste

B) Running cost is more

C) Plant requires large space

D) Installed away from load centre

31 / 78

Category: Electrician 4 sem Module 5

Which fuel is available in plenty in India for power generation?

A) Coal

B) Diesel

C) Gas oil

D) Gasoline

32 / 78

Category: Electrician 4 sem Module 5

What is the function of air pre heater in a steam power station?

A) Heats feed water

B) Supplies hot air to economiser

C) Supplies hot air to super heater

D) Extracts heat from flue gases and heats input air

33 / 78

Category: Electrician 4 sem Module 7

What is the defect in an air circuit breaker, if trips intermittently on loading?

A) Incorrect setting of relay

B) Excessive heat

C) Insufficient air pressure

D) Line voltage is too high

34 / 78

Category: Electrician 4 sem Module 6

What is the advantage of over head lines compared to underground cable?

A) Public safety is more

B) Faults can be located easily

C) No interference with the communication lines

D) Not liable to the hazards from lightning discharges

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Category: Electrician 4 sem Module 6

Which type of line insulator is used at the dead ends of the H.T overhead lines?

A) Pin insulator

B) Disc insulator

C) Stay insulator

D) Post insulator

36 / 78

Category: Electrician 4 sem Module 6

What is the name of the insulator used in O.H lines?

A) Pin insulator

B) Post insulator

C) Strain insulator

D) Shackle insulator

37 / 78

Category: Electrician 4 sem Module 7

What is the purpose of trip coil used in circuit breakers?

A) Easy operation

B) Remote operation

C) Accurate operation

D) Emergency operation

38 / 78

Category: Electrician 4 sem Module 6

What is the advantage of AC power transmission?

A) Corona loss negligible

B) Stress on transmission lines is minimum

C) Low voltage drop in transmission lines

D) Voltages can be stepped up and stepped down easily

39 / 78

Category: Electrician 4 sem Module 7

What is the pick-up voltage in a over voltage relay indicated?

A) Working voltage of relay

B) Maximum voltage rating of relay

C) Minimum voltage rating of relay

D) Minimum voltage to start the relay

40 / 78

Category: Electrician 4 sem Module 7

Which circuit breaker is used as a switch and protective device in the domestic wiring circuit?

A) Air circuit breaker

B) Miniature circuit breaker

C) Moulded case circuit breaker

D) Earth Leakage circuit breaker

41 / 78

Category: Electrician 4 sem Module 5

Which material is used in solar cell?

A) Silicon

B) Copper

C) Antimony

D) Phosphorus

42 / 78

Category: Electrician 4 sem Module 6

What is the reason of keeping binding wire gap too close and very tight in pin insulator?

A) Avoid sparking

B) Avoid corrosion

C) Avoid oxide formation

D) Avoid atmospheric pressure

43 / 78

Category: Electrician 4 sem Module 6

Which is the permissible load for lighting subcircuit in domestic wiring as per IE rules?

A) 800 W

B) 1200 W

C) 2400 W

D) 3000 W

44 / 78

Category: Electrician 4 sem Module 6

What is the reason for the conductor cross- sectional area can fully utilised on transmission of DC as compared to AC?

A) No heat loss

B) No skin effect

C) No power loss

D) No corona loss

45 / 78

Category: Electrician 4 sem Module 5

What is the major disadvantage of wind power generation?

A) Pollution effect is more

B) Requires high technology

C) Plant installation more complicated

D) Wind power is not constant and steady

46 / 78

Category: Electrician 4 sem Module 6

What is the name of line insulator?

A) Suspension type insulator

B) Pin type insulator

C) Disc type insulator

D) Shackle type insulator

47 / 78

Category: Electrician 4 sem Module 7

What is the function of relay to the breaking operation of circuit breaker in control circuit?

A) Sensing the fault quantities

B) Analyzing the condition of breaker

C) Controlling the Speed in case of fault

D) Interpreting the fault situation to operate breaker

48 / 78

Category: Electrician 4 sem Module 5

What is the advantage of non conventional power generation?

A) More reliable

B) More efficient

C) Low initial cost

D) Reduce pollution

49 / 78

Category: Electrician 4 sem Module 5

Which turbine is used for high heads in hydro electric power plant?

A) Kaplan turbine

B) Impulse turbine

C) Francis turbine

D) Reaction turbine

50 / 78

Category: Electrician 4 sem Module 5

How the potential energy from water flowing is converted as kinetic energy to generate power?

A) By storing water in high quantity

B) By using surge tanks at the water canal

C) By using water turbine to drive alternator

D) By creating high head through penstocks

51 / 78

Category: Electrician 4 sem Module 7

Which circuit breaker is installed along with wiring circuit against leakage current protection?

A) OCB

B) MCB

C) ELCB

D) MCCB

52 / 78

Category: Electrician 4 sem Module 6

What is the purpose of cross-arm in O.H lines?

A) Provide more support to the O.H pole

B) Protect from short between conductors

C) Reduce the sag of the lines between poles

D) Holding the insulators where the conductors are fastened

53 / 78

Category: Electrician 4 sem Module 6

How the sparking on the aluminium cored conductors binding joints can be prevented?

A) Keeping binding turns very close

B) Making binding turns very tight

C) Providing guard wires below the conductors

D) Providing more than one binding

54 / 78

Category: Electrician 4 sem Module 5

How electricity produced in solar panel?

A) While sunlight strikes glass

B) While sunlight strikes nickel plate

C) While sunlight strikes manganese

D) While sunlight strikes on photovoltaic cell

55 / 78

Category: Electrician 4 sem Module 5

Which is the conventional power generation?

A) Wind power generation

B) Tidal power generation

C) Solar power generation

D) Thermal power generation

56 / 78

Category: Electrician 4 sem Module 5

What is the function of charge controller in battery based micro hydel power generation?

A) Controls the over voltage

B) Disconnects turbine from the battery

C) Prevents the over charging of battery

D) Controls the over speed of the turbine

57 / 78

Category: Electrician 4 sem Module 6

What is the name of the insulator?

A) Stay insulator

B) Shackle insulator

C) Suspension insulator

D) Single shed pin insulator

58 / 78

Category: Electrician 4 sem Module 5

Which device senses the wind speed in a wind power generation?

A) Exciter unit

B) Turbine controller

C) Chopper controller

D) Line controller unit

59 / 78

Category: Electrician 4 sem Module 6

What is the main purpose of crossarm used in electric poles?

A) Supporting the line conductors

B) Holding the insulators on overhead line

C) Avoids short circuit between conductors

D) Reduces conductor sag between supports

60 / 78

Category: Electrician 4 sem Module 5

Which power generation plant is having more reliability in operation?

A) Hydro power plant

B) Diesel power plant

C) Nuclear power plant

D) Thermal power plant

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Category: Electrician 4 sem Module 5

What is the function of economiser in steam power plant?

A) Converts water into steam

B) Heats the air by the flue gases

C) Heats the feed water by the flue gases

D) Purifies the feed water by chemical treatment

62 / 78

Category: Electrician 4 sem Module 5

Which type of power plant is more efficient?

A) Diesel plant

B) Steam power

C) Hydro electric

D) Nuclear power

63 / 78

Category: Electrician 4 sem Module 7

What is the name of circuit breaker?

A) Oil circuit breaker

B) Air blast circuit breaker

C) Vacuum circuit breaker

D) Air break circuit breaker

64 / 78

Category: Electrician 4 sem Module 5

Which is the natural source of energy?

A) Sun

B) Heat

C) Coal

D) Biogas

65 / 78

Category: Electrician 4 sem Module 5

What is the name of the atomic material used for nuclear fission in nuclear power station?

A) Silicon

B) Thorium

C) Antimony

D) Cadmium

66 / 78

Category: Electrician 4 sem Module 6

What is ACSR stands for?

A) All Conductors Steel Reinforced

B) Aluminium Core Steel Reinforced

C) Aluminium Covered Steel Reinforced

D) Aluminium Conductor Steel Reinforced

67 / 78

Category: Electrician 4 sem Module 5

Name the constituent marked as ‘X’ of the schematic arrangement of hydro electric plant.

A) Penstock

B) Surge tank

C) Valve house

D) Power house

68 / 78

Category: Electrician 4 sem Module 6

What is the voltage ratio in A.C distribution line adopted for domestic consumers?

A) 415 V/240 V

B) 240 V/110 V

C) 415 V/110 V

D) 11 KV/415 V

69 / 78

Category: Electrician 4 sem Module 6

What is the name of conductor used on overhead lines?

A) ACSR

B) Aluminium

C) Galvanised iron

D) Hard drawn copper

70 / 78

Category: Electrician 4 sem Module 5

Which is the main constituent of biogas?

A) Oxygen

B) Methane

C) Hydrogen

D) Carbon dioxide

71 / 78

Category: Electrician 4 sem Module 7

What is the defect in a oil circuit breaker if the oil heats up excessively?

A) Line voltage is too high

B) Excessive load

C) Poor dielectric strength

D) Defective tripping mechanism

72 / 78

Category: Electrician 4 sem Module 5

Which is the non conventional energy source?

A) Wind

B) Water

C) Steam

D) Diesel

73 / 78

Category: Electrician 4 sem Module 6

Which type of A.C transmission is universally adopted?

A) Two phase four wire

B) Two phase three wire

C) Single phase two wire

D) Three phase three wire

74 / 78

Category: Electrician 4 sem Module 6

What will happen to the string arrangement of disc insulators, if one of the disc insulator gets damaged?

A) Whole string become useless

B) No effect operates normally

C) Only the damaged disc will not function

D) Damaged insulator and the adjacent insulator will not function

75 / 78

Category: Electrician 4 sem Module 6

Which type of line insulator is used for terminating on corner post?

A) Pin insulator

B) Strain insulator

C) Shackle insulator

D) Suspension insulator

76 / 78

Category: Electrician 4 sem Module 5

Which is the non conventional power generation?

A) Diesel power generation

B) Nuclear power generation

C) Wind mill power generation

D) Hydro-electric power generation

77 / 78

Category: Electrician 4 sem Module 6

Which substation the transmission line voltage is stepped down to consumer supply voltage?

A) Mobile substation

B) Mining substation

C) Secondary substation

D) Distribution substation

78 / 78

Category: Electrician 4 sem Module 7

Which relay hold their contacts in position after power is cutoff?

A) Read relay

B) Current relay

C) Voltage relay

D) Latching relay

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