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.Management Sciences
Category: Electrical Engineering Mcqs
An SCR can exercise control over____________of a.c. supply?
A. Positive half-cycles only
B. Negative half-cycles only
C. Both positive and negative half-cycles
D. Positive or negative half-cycles
Which of the following are the constants of the transmission lines ?
A. Resistance
B. Inductance
C. Capacitance
D. All of the above
Hysteresis loss and eddy current loss are used in____________?
A. induction heating of steel
B. dielectric heating
C. induction heating of brass
D. resistance heating
By which of the following methods string efficiency can be improved?
A. Using a guard ring
B. Grading the insulator
C. Using long cross arm
D. Any of the above
E. None of the above
Double edge modulation eliminates certain harmonics when the reference is a__________?
A. Sine wave
B. Square wave
C. Triangular wave
D. Trapezoidal wave
A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?
A. 50 joules
B. 150 joules
C. 200 joules
D. 250 joules
Synchronous motor always runs at______________?
A. the synchronous speed
B. less than synchronous speed
C. more than synchronous speed
D. none of the above
Large capacity generators are invariably___________?
A. water cooled
B. natural air cooled
C. forced air cooled
D. hydrogen cooled
In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be____________?
A. 3000 r.p.m.
B. 1500 r.p.m.
C. 750 r.p.m.
D. none of the above
Laminated cores, in electrical machines, are used to reduce____________?
A. copper loss
B. eddy current loss
C. hysteresis loss
D. all of the above
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