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.Management Sciences
Category: Electrical Engineering Mcqs
With rise in temperature the resistance of semi-conductors_________________?
A. decreases
B. increases
C. first increases and then decreases
D. remains constant
Air-core coils are practically free from______________?
A. hysteresis losses
B. eddy current losses
C. both (A) and (B)
D. none of the above
The output of a particular Op-amp increases 8V in 12µs. The slew rate is_______________?
A. 90 V/µs
B. 0.67 V/µs
C. 1.5 V/µs
D. none of these
The low power factor of induction motor is due to___________?
A. rotor leakage reactance
B. stator reactance
C. the reactive lagging magnetizing current necessary to generate the magnetic flux
D. all of the above
A closed switch has a resistance of_____________?
A. zero
B. about 50 ohms
C. about 500 ohms
D. infinity
By the use of which of the following m D.C. can be obtained from AC. ?
A. Silicon diodes
B. Mercury arc rectifier
C. Motor generator set
D. Any of the above
Spacers are provided between adjacent coils?
A. to provide free passage to the cooling oil
B. to insulate the coils from each other
C. both A. and (b)
D. none of the above
If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will__________?
A. decrease
B. increase
C. remains unchanged
D. become zero
In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?
A. Top switch of each leg is on at any instant
B. Bottom switch of each leg is on at any instant
C. Either A. or B.
D. None of these
In main line service as compared to urban and suburban service______________?
A. distance between the stops is more
B. maximum speed reached is high
C. acceleration and retardation rates are low
D. all of the above
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