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.Management Sciences
Category: Electrical Engineering Mcqs
Which of the following circuit elements will oppose the change in circuit current ?
A. Capacitance
B. Inductance
C. Resistance
D. All of the above
The back e.m.f. of a synchronous motor depends on______________?
A. speed
B. load
C. load angle
D. all of the above
At 100% modulation, the power in each sideband is _____________ of that of carrier?
A. 50%
B. 40%
C. 60%
D. 25%
If a shunt motor is started with its field winding open then___________?
A. It will rotate at the same speed as that with its field winding closed
B. It will rotate at less speed as that with its field winding closed
C. It will rotate at dangerously high speed
D. None of these
A dc series motor should not be started on no load because it would___________?
A. not develop starting torque
B. fail to start without load
C. run at dangerously high speed
D. draw more current without producing sufficient torque
In a radio receiver, we generally use ………….. oscillator as a local oscillator
A. Crystal
B. Wien-bridge
C. Phase-shift
D. Hartley
If the doping level in a crystal diode is increased, the width of depletion layer_____________?
A. remains the same
B. is decreased
C. in increased
D. none of the above
In majority of instruments damping is provided by______________?
A. fluid friction
B. spring
C. eddy currents
D. all of the above
The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it_____________?
A. improves the efficiency
B. helps the rotor teeth to remain under the stator teeth
C. helps in reducing the tendency of the rotor teeth to remain under the stator teeth
D. improves the power factor
The short circuit in any winding of the transformer is the result of_______________?
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage
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