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.Management Sciences
Category: Electrical Engineering Mcqs
In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
A. Changes abruptly with frequency
B. Is constant
C. Changes uniformly with frequency
D. None of the above
What will happen if the transformers working in parallel are not connected with regard to polarity ?
A. The power factor of the two trans-formers will be different from the power factor of common load
B. Incorrect polarity will result in dead short circuit
C. The transformers will not share load in proportion to their kVA ratings
D. none of the above
The maximum efficiency of resistance loaded class A power amplifier is _________________?
A. 5%
B. 50%
C. 30%
D. 25%
The pressure coil of a wattmeter should be connected on the supply side of the current coil when______________?
A. load impedance is high
B. load impedance is low
C. supply voltage is low
D. none of the above
The selection of an electric motor for any application depends on which of the following factors ?
A. Electrical characteristics
B. Mechanical characteristics
C. Size and rating of motors
D. Cost
E. All of the above
Between the incoming and outgoing devices in voltage commutation
A. Large overlapping takes place
B. Small overlapping operation
C. No overlapping operation
D. None of these
Which of the following amplifier circuit using junction transistor has the best gain?
A. Common base
B. Common emitter
C. Common collector
D. All have the same gain
For a purely inductive circuit which of the following is true ?
A. Apparent power is zero
B. Relative power is.zero
C. Actual power of the circuit is zero
D. Any capacitance even if present in the circuit will not be charged
The bearings used to support the rotor shafts are generally______________?
A. ball bearings
B. bush bearings
C. magnetic bearmgs
D. needle bearings
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