Mix Electrical MCQ

1➤ In single phase full wave controlled bridge rectifier, minimum output voltage and maximum output voltage are obtained at which conduction angles?

180°,180° 0°, 180°180°,0°0°,0°

2➤ If load torque Varies with sqaure of speed and terminal volatage of DC shunt motor is half then speed

Will be halvedWill be double Remains constantBecomes triple

3➤ Which of the following digital devices required an external refresh circuit?

DRAMFlash memoryEEPROMSRAM

4➤ The most economic load on an underground cable is

Equal to surge impedance loadingGreater than its surge impedance loading Less than surge impedance loading All of these

5➤ A low pass circuit with large time constant can be used as

DiffrentiatorAmplifier AlternatorIntegrator

6➤ The main drawback of JFET is it's

Higher input impedance Lower gainLower input impedance Higher noise

7➤ What type of earthing is found in 11 KV substation

Plate typePipe typeNone of theseStrip type

8➤ The advantage of double squirrel cage induction motor over single cage rotor is that it's

Starting current is lowerPower factor is higherSlip is largerEfficiency is higher

9➤ Symmetrical breaking capacity of circuit breaker is

Equal to asymetrical breaking capacityLess than asymetrical breaking capacityNot related Greater than asymetrical breaking capacity

10➤ Transistor acts as an amplifier in which of following area of operation?

Barrier areaSaturation regionActive areaCutoff region

11➤ HRC fuse provides best protection against

Open circuit OverloadReverse currentShort circuit

12➤ The main advantage of active filter is that it can be realised without using

InductorCapacitorTransistorResistor

13➤ The identification of fault location in an HV cable is done by

Life testImpulse testPartial discharge scanning testNone of these

14➤ The purpose of interconnector used in ring main system is

To increase voltage dropTo increase reliability To reduce voltage drop All of these

15➤ In DC chopper per unit ripple is maximum when duty cycle D is

0.51Less than 0.5All of these

16➤ Which is not related to tachometer?

Rotation speed of shaftFour strokeRevolution counterRPM gauge

17➤ Which model of transmission line has the lowest magnitude of A?

Nominal T modelSending end capacitor modelReceiving end capacitor modelAll of these

18➤ What is function of turbine in hydro power plant?

Produce electrical powerProduce hydro powerProduce mechanical powerProduce heat power

19➤ The measurement of resistance by carry foster bridge no error is introduced due to

Connecting leadsAll of these Thermoelectric emfsContact resistance

20➤ At what level of current flow during electric shock death is possible

50 to 100mA1 to 8 mA10 to 20mA20 to 50 mA

21➤ What is other name of unit impulse function?

Direct delta functionArea function Dirac delta function Unit function

22➤ Self reactance of coil can be measured usinf

Slide wire potentiometer Brooks deflection potentiometer Vernier potentiometer Polar type potentiometer

23➤ For both overexcited and underexcited synchronous motor when load is increased p.f tends to become

UnityDecrease leadingDecrease laggingZero

24➤ The normal voltage for dielectric heating is

1500 v30KV15 KV33 KV

25➤ Which of following is not addressing modes in 8085 up?

Direct addressing modesIndirect addressing modesregister addressing modes None of these

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