A. high excitation only
B. low excitation only
C. both A. and (b)
D. none of the above
Electrical Engineering Mcqs
The man made noise sources is / are_____________?
A. Motors
B. Switches, radio interferences
C. Computers, digital electronics
D. All of these
The torque of an induction motor is___________?
A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip
D. none of the above
The characteristics of drive for crane hoisting and lowering are which of the following ?
A. Precise control
B. Smooth movement
C. Fast speed control
D. All of the above
For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?
A. Be zero
B. Be 0.01 V
C. Not fall below 0.7 V
D. Be between 0 V and 0.1 V
During the charging and discharging of a nickel-iron cell____________?
A. corrosive fumes are produced
B. water is neither formed nor absorbed
C. nickel hydroxide remains unsplit
D. its e.m.f. remains constant
Power electronics essentially deals with control of a.c. power at____________?
A. Frequencies above 20 kHz
B. Frequencies above 1000 kHz
C. Frequencies less than 10 Hz
D. 50 Hz frequency
The overall efficiency of thermal power plant is equal to____________?
A. Rankine cycle efficiency
B. Carnot cycle efficiency
C. Regenerative cycle efficiency
D. Boiler efficiency x turbine efficiency x generator efficiency
The operating voltage of a meggar is about_______________?
A. 6 V
B. 12 V
C. 40 V
D. 100 V
Slip-rings in a synchronous motor carry____________?
A. direct current
B. alternating current
C. no current
D. all of the above
