Electrical FREE practice MCQ

1➤ In a DC machine, with the number poles being equal to 2, which of the following is possible? .

Electrical degrees = mechanical degreesElectrical degrees = 2 x (mechanical degrees) Electrical degrees = 8 x (mechanical degrees)Electrical degrees = 4 x (mechanical degrees)

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

inductanceCapacitanceresistancecurrent

3➤ In a full bridge diode rectifier, if a diode is removed then the remaining circuit produces a voltage similar to_________ voltage.

half rectifiedsourcezerofull rectified

4➤ The current flowing in the conductors of a DC motor is

TransientsD.C as well as A.CA.CD.C

5➤ Unit of voltage can also be represented as

Coulomb / SecondJoule / SecondJoule - SecondJoule/ Coulomb

6➤ Interpoles are used in

Lap wound machineWave wound machineBoth lap and wave wound machineNone of the above

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

Nuclear power plantSolar Power PlantDiesel power plant Hydroelectric power plant

8➤ The field control of a DC shunt motor gives

Constant speed DriveVariable load speed driveConstant torque driveConstant kW drive

9➤ What is the power factor angle of an RC series circuit?

tan-1 (wl/CR)tan-1 (1/wCR)tan-¹(CR/wl)tan-¹(wCR)

10➤ In feedback amplifiers, Feedback factor/Feedback ratio_________

Voltage gain with positive feedbackOpen loop voltage gainVoltage gain with negative feedbackLoop gain

11➤ The ratio of output to the input is________ At resonance.

the maximum50%the minimumzero

12➤ An overall power generation economics is E= a+bKW+ckWH, where c is,

constant chargerunning chargefixed charge waste charge

13➤ Which type of transformer increases the current level from primary to secondary?

Step upStep downIsolation transformer None of these

14➤ Which type of machine produced the Rotating magnetic field?

Two phase induction motorDC shunt motorStepper motor DC series motor

15➤ Which of the following is NOT used as a deflecting force in indicating instruments?

Induction effectChemical effect Thermal effectEddy current effect

16➤ Which of the following is NOT true for an LED lamp used as a panel indicator lamp in place of a filament lamp?

Lesser power consumptionSensitive to voltage fluctuationsLonger operating life Failure of lamp is low

17➤ The continuous and uninterrupted availability of energy to a specific country or region is called as:

energy densityenergy conservation energy qualityenergy security

18➤ Which of the following is NOT a part of a digital energy meter?

A digital-to-analog converterA real-time clockA metering circuitA processing and communication circuit

19➤ What is the main purpose of using stranded conductors in overhead lines for power transmission?

To reduce the costTo increase the current-carrying capability To increase the mechanical strengthTo increase the flexibility

20➤ What is the technical feasibility of priority ‘C’, as per project priority guidelines for energy conservation measures?

Existing technology is adequate Existing technology is inadequateNeed major breakthroughExisting technology may be updated, lack of information

Your score is