Most useful MCQ

1➤ Injection of VARs is required to

Increases the voltage at the receiving endget a good voltage profile.compensate for line lossesNone

2➤ Switching operations on the transmission line have severe impact on-

dynamic-state stabilitysteady-state stability transient-state stabilityNone of the above

3➤ Ten times change in frequency is known as:

GainCut-off frequencyDecibelDecade

4➤ What is Eureka?

It is an alloy of nickel and chromium.It is an alloy of nickel, chromium and aluminiumIt is an alloy of iron, chromium and aluminium. It is an alloy of nickel and copper

5➤ Which one of the following is a part of the tower that is buried under the ground?

Anchor BracesStrut inclined supportGuy wire

6➤ What are the components of a digital multimeter?

An attenuator, an ADC, a display and a recording mechanismA comparator and a pulse generatorAn attenuator, a rectifier and a filterA PLL and a counter

7➤ ______is measure of closeness in shape between a waveform and its fundamental component.

Harmonic factor Distortion factorTotal harmonic distortion Lowest order harmonics

8➤ What is the short circuit current of an alternator dependent on, if a line to line fault occurs?

Synchronous reactanceShort circuit resistanceTransient reactanceInductive reactance

9➤ What is the internal voltage drop in an ideal constant-voltage source?

Variable01Very high

10➤ What is the recommended width of right of way (ROW) for the transmission line of 33 kV?

15meters 52 meters25meters18 meters

11➤ What is the recommended width of right of way (ROW) for the transmission line of 400 kV?

46meters40 meters52 meters35 meters

12➤ What is the recommended width of right of way (ROW) for the transmission line of 110 kV?

23 meters52 meters22meters35 meters

13➤ What happens to the terminal voltage when an alternator is connected to an infinite bus bar and its excitation is gradually increased?

The terminal voltage will dropThe terminal voltage will riseThe terminal voltage will remain unalteredThe terminal voltage will vary rapidly

14➤ How much of energy is required for refining gold?

300 to 350 kWh/ton100 to 150 kWh/ton 250 to 350 kWh/ton400 to 550 kWh/ton

15➤ Which of the following is usually not the generating voltage?

11 kV6.6 kV9.9 kV13.2 kV

16➤ In a thermal power plant, Economiser is use to heat

Feed WaterAirFlue GasesCoal

17➤ Series reactors are used to -

bring down the fault level within the capacity of switchgearimprove the transmission efficiencyimprove voltage regulationimprove the P.F

18➤ Which of the following function is not performed by a transformer?

Transfer electric energy by electromagnetic induction Transfer electric energy from one circuit to anotherTransfer electric energy where two electric circuit are in mutual inductive influence of each otherTransfer electric energy with a change of frequency

19➤ The ratio of rotor copper loss with rotor output is:

s/(1 –s)(1 – s) 1/sS

20➤ The amount of electrical energy stored for every kilogram of battery mass is defined as

energy densityspecific energyself-discharge ratesspecific power

21➤ Which of the following is NOT a part of automatic control systems?

ATransformer systemThe fluid to be controlled A sensor for the process variablecontroller which affects the actuator

22➤ ___ are used in control systems to attain the mechanical matching of the motor to the load.

Synchros DC servomotorsStepper motorsGear trains

23➤ In simple Series RLC' circuit. ______ corresponds to infinite capacitance C = ∞ and zero inductance L= 0.

Purely inductive circuitPurely resistive circuit RLC' Series CircuitPurely capacitive Circuit

24➤ In _____ the susceptibility will decrease with increase in temperature and they have relatively small susceptibility all temperatures..

Ferromagnetic materialsSuperparamagnetic materials Ferrimagnetic materialsAnti ferromagnetic materials

25➤ ____ possess NO free-charge carriers and thus are non-conductive.

ConductorsSemiconductorsSaltsInsulators

26➤ _____ has the property of storing potential energy

springdamperMassFriction

27➤ A register capable of incrementing and/or decrementing its contents.

DecoderCounterMultiplexerDemultiplexer

28➤ The difference between the tooth space and tooth width in mechanical systems which is essential for rapid working gear transmission is known as ____

backlashrelaydead zonefriction

29➤ Fermi energy level for n-type extrinsic semiconductors lies ____

None of these optionsclose to the conduction bandin the middle of the band gapclose to the valence band

30➤ The systems which control the motion of electrical machines are known as ____

electrical motorselectric heating electrical driveselectroforming

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