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.Management Sciences
Category: Electrical Engineering Mcqs
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
A. They are mechanically strong
B. They do not require any voltage for filament heating
C. Both (A) and (B)
D. None of the above
For derries and winches which of the following drives can be used ?
A. Pole changing squirrel cage motors
B. D.C. motors with Ward-leonard con-trol
C. A.C. slip ring motors with variable resistance
D. Any of the above
The letters AVC stand for ________________?
A. Audio voltage control
B. Abrupt voltage control
C. Automatic volume control
D. Automatic voltage control
In a control system the output of the controller is given to_____________?
A. final control element
B. amplifier
C. comparator
D. sensor
F. none of the above
In a three phase voltage source inverters____________?
A. Only amplitude of voltage is controllable
B. Only phase is controllable
C. Both amplitude and phase is controllable
D. Amplitude, phase and frequency of voltages should always be controllable
If the value of collector current IC increases, then the value of VCE ______________?
A. Remains the same
B. Decreases
C. Increases
D. None of the above
A _________ is used to measure the stator % winding temperature of the generator?
A. thermocouple
B. pyrometer
C. resistance thermometer
D. thermometer
The main reason for generation of harmonics in a transformer could be_______________?
A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of core
In tramways which of the following motors is used ?
A. D.C. shunt motor
B. D.C. series motor
C. A.C. three phase motor
D. AC. single phase capacitor start motor
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