Electrical MCQ series

1➤ Which of the following statements is true for salient pole alternators?

They are driven by steam turbines.The axial length is larger in length. The diameter of these alternators is smallThe speed of operation of these alternators lies in low to medium range

2➤ As per increasing luminous efficiency which arrangement is correct?

Carbon-Arc< Incandescent < Halogen < Mercury iodide. Mercury iodide < Carbon-Arc < Halogen < IncandescentMercury iodide < Halogen < Carbon-Arc < Incandescent Incandescent Halogen < Carbon-Arc < Mercury iodide

3➤ Which of the following is NOT a characteristic of a shunt type fault? .

Increase in current Fall in currentFall in voltage Fall in frequency

4➤ Which of the following circuits CANNOT be used to trigger the SCR?.

Resistance triggeringRC triggeringSnubber triggering UJT triggering

5➤ In series resonance, the resonance frequency is the _____ two half power frequencies.

algebraic sum of geometric mean ofdifference betweenratio of

6➤ Which of the following components is absent in a block diagram?

Takeoff pointBlockSumming pointSelf loop

7➤ Which of the following is NOT true for the three-phase Delta system?

Most of the three-phase induction motors are delta connected. Delta connection is most suitable for rotary convertorsIn Delta connection, the neutral point can be earthedDelta connection is highly reliable.

8➤ For a synchronous generator supplying a balanced 3-phase load, the armature reaction flux is,_______ in magnitude and rotates at_______ speed.

Variable, Super-synchronous Constant, SynchronousConstant, Sub-synchronousVariable, Sub-synchronous

9➤ Generally, fault location in cables detected by comparing .

Dielectric lossesResistance of the insulated conductorsCapacitance of the insulated conductorsInductance of the insulated conductors

10➤ Select the most suitable pressure indicating device from the following list to measure pressure in the range 0-30 Mpa.

diaphragmMcLeod gauge Mercury filled U-tube manometerBourdon gauge

11➤ Which among the following is not a method for harmonic assessment?

Fourier SeriesHartley TransformLaplace TransformFourier Transform

12➤ In the power system, which bus is known as swing bus?

GeneratorSlack busLoad busVoltage controlled bus

13➤ Which of the following devices CANNOT be used as a bi- directional switch?

IGBTTRIACMCTDIAC

14➤ In a RLC series circuit, the frequency is above the resonance frequency. What will be the power factor?

Leading, <1 Lagging, <11None of these

15➤ As per the sampling theorem what should be the relation between the frequency of sampling signal ωS and cut-off frequency ωM for a low pass filter?

𝜔𝑆 > 𝜔𝑀/2 𝜔𝑆 < 𝜔𝑀𝜔𝑆 > 2𝜔𝑀 𝜔𝑆 = 𝜔𝑀

16➤ Which of the following is truly a disadvantage of Maxwell's inductance bridge?

The balanced equation is dependent on the frequency of measurementIt cannot be used for measurement of high Q valuesThis bridge cannot be used to test the heavy current carrying coils irrespective of any adjustments.The scale does not give the inductance directly

17➤ Which of the following statements is correct regarding the testing of electronic components?

A UPS should be tested in no load condition.A low resistance across the base-emitter or base- collector region indicates a reverse biased condition in a transistor.A battery is said to be fully discharged if the voltage while testing with a high discharge tester is below 1 V.While testing a DIAC using an ohmmeter, it should show a high resistance from one direction and low resistance from the opposite direction.

18➤ Which of the following electrical wire joints is used in overhead lines for taping the electrical energy perpendicular to the service lines?

Scarfed jointBritannia Tee jointBritannia joint Western Union joint

19➤ MOV protection in a UPS system is used for which of the following?

Protection against overload currentProtection against frequency variations Protection against high input voltageProtection against temperature variations

20➤ How many types of circuit breakers are available based on the arc quenching medium used?

2345

21➤ Shackle type insulators are used for :

Dead end onlyTurning end, Dead end, low voltageStraight end, Turning end, high voltageStraight end, Dead end, high voltage

22➤ In torque-current analogy, moment of inertia in mechanical analogous to system is_______ in electrical system.

Capacitanceinductanceresistancecurrent

23➤ Which of the following statements is correct regarding a nuclear power plant?

The control rods are made of graphite.The moderator consists of cadmium.Nuclear fission process occurs in a nuclear reactorThe chain reaction in a nuclear reactor is uncontrollable

24➤ Which of the following is NOT true for a signal flow graph(SFG)?

Overall gain of an SFG can be determined by using Mason's gain formulaSFG of a system is not uniqueAlgebraic sum of all incoming signals and outgoing nodes is zero in SFG SFG is applied to both linear and complex systems

25➤ The symmetrical components, meant for solution to unbalanced system are:

In opposition to adjacent vectorsequal in length to adjacent vectors equal in phase angles with adjacent vectorsequal in length and have equal phase angles between adjacent vectors

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