Practice MCQ electrical branch

1➤ In metropolitan areas most commonly employed distribution scheme is

Radial schemeInterconnected systemRing scheme Anyone from the above

2➤ An efficient method to reduce the steepness of a wave front is.

By connecting an inductor between line and earth wireBy connecting a capacitor between line and earth wire By connecting an inductor in series with the lineEither (2) and (3)

3➤ A point charge P generates an electric field of circular shape and another point charge Q is rotated along this circle. What is the work done by the electric field on the rotating charge in one complete revolution?

zero at all pointspositive at the centernegative at the centerzero if the charge P is at the center and nonzero at other points

4➤ The power factor of induction motor at no load have the value approximately

0.9 lead0.2 lag0.2 lead0.9 lag

5➤ Iron loss in a transformer occurs in:

CoreInsulating oil RotationWinding

6➤ The use of higher flux density in the transformer design

Increases weight per kWNo relation with weight of transformerReduces weight per KVAIncreases the weight per KVA

7➤ In the protection of transformer, harmonic restraint is used to guard against

Unbalanced operationMagnetizing inrush currentOver voltageLighting

8➤ What is the force of attraction between two electric charges of opposite polarity having 1 Coulomb each when placed at 1 m?

4π x 10⁹ Newton8.857 × 10¹² Newton5.54 x 10¹¹Newton9 × 10⁹ Newton

9➤ Which of the following has highest permeability?

VacuumDiamagnetic materialFerromagnetic materialParamagnetic material

10➤ Five capacitors each of 5 µF are connected in series, the equivalent capacitance of the system will be

1 μF5 μF10 μF 25 μF

11➤ A 50-Hz, 6-pole turbo generators rated 100 MVA, 14 KV has inertia constant of 15 MJ/MVA. Find stored energy in the rotor at synchronous speed.

150 MJ100 MJ1500 MJ1000 MJ

12➤ Among the following, identify the incorrect statement.

An oscillator is an amplifier that supplies its own input signalIn-phase feedback is called positive feedback.All oscillators generate sine waveAn oscillator is a circuit that produces AC output always

13➤ In which of the following reluctant power is developed

TransformerNon salient pole alternator Squirrel cage induction motor Salient pole alternator

14➤ What happens when alternating current passes through a conductor?

Portion of conductor near the surface carries less current as compared to the coreEntire current passes through the core of the conductorIt remains uniformly distributed throughout the section of conductorPortion of conductor near the surface carries more current as compared to the core

15➤ The early effect in BJT is related to

Avalanche breakdownBase narrowing Thermal runaway Zener breakdown

16➤ The motor used on a small lathe is usually

3-Phase Synchronous MotorSingle-phase capacitor run Motor D.C shunt MotorUniversal Motor

17➤ To which of the following power plants are the terms 'fire point' and 'flash point' related?.

Nuclear power plantDiesel power plantSolar Power PlantHydroelectric power plant

18➤ To measure the resistance of about 8 0hm which instrument should be used?

Wheatstone's bridgeWattmeterMeggerKelvin's double bridge

19➤ A limiter circuit is also known as a:

chopper circuitclamp circuitChopping circuitClipper circuit

20➤ Lumens can be calculated as

Candle power x Solid angle Brightness x normal angle Candle power x normal angleFilament power x Solid angle

21➤ What is the condition for reciprocity and symmetry in Y- parameter representation?

Y21=Y11 and Y22=Y21Y21=Y12 and Y11=Y22Both a and bNone

22➤ Superposition theorem is applicable for:

Linear and lateral network Linear and bilateral networks Non linear and lateral network Non Linear and bilateral networks

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