SSC JE ELECTRICAL 2018 WITH SOLUTION SET-1 QUIZ

In a synchronous Motor, the damping winding is generally used to

Provide starting torque

Reduces the Noise Level

Prevent hunting and provide starting Torque

Reduces the eddy current

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What is the characteristics of the common collector configuration amplifier with respect to the input and output impedance?

High input Impedance and Low Output Impedance

Low Input Impedance and Low Output Impedance

Low Input Impedance and High Output Impedance

High input Impedance and High Output Impedance

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In a synchronous motor which loss varies with the load?

Core Loss

Copper Loss

Windage loss

Bearing friction Loss

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A zero watt Lamp consumes

No power

About 5 to 7 W power

About 15 to 20 W power

About 25 to 30 W Power

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The maximum speed variation in a synchronous motor is

Zero

2%

10%

5%

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A three-phase synchronous motor will have

Three slip-rings

Two slip-rings

One slip-ring

No slip-rings

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Calculate the phase angle between the voltage and current phasor of a series RL circuit having the resistance of 65 Ohms and Inductive reactance of 37.53 ohms when supplied by a frequency of 60 Hz

45°

15°

60°

30°

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The ripple factor is

Peak Value/DC Value

Peak Value/RMS Value

RMS value/DC Value

RMS Value/Peak Value

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In a synchronous motor running with the fixed excitation, when the load is increased two times, its torque angle becomes approximately

Half

Four Times

No Change

Twice

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The main drawback of resistance welding is

High initial as well as High maintenance cost

None of these

Difficult shapes and sections cannot be welded

Only similar metals can be welded

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