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.Management Sciences
Category: Electrical Engineering Mcqs
In lap winding, the number of brushes is always_____________?
A. double the number of poles
B. same as the number of poles
C. half the number of poles
D. two
A condenser suitable for D.C. only is________?
A. metallic plate variable gang condenser
B. metallic paper capacitor
C. oil impregrated paper condenser
D. poled aluminium electrolytic condenser
Which of the following factors affect resistivity of metals ?
A. Age hardening
B. Alloying
C. Temperature
D. Cold work
E. All of the above
The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?
A. 10 atoms for 108 atoms
B. 1 atom for 108 atoms
C. 1 atom for 104 atoms
D. 1 atom for 100 atoms
In case one phase of a three-phase synchronous motor is short-circuited the motor will____________?
A. not start
B. run at 2/3 of synchronous speed
C. run with excessive vibrations
D. take less than the rated load
Binary’vapour cycles are used to_____________?
A. increase the performance of the condenser
B. increase the efficiency of the plant
C. increase efficiency of the turbine
What is used to protect the SCR from over current ________________?
A. CB and fuse.
B. Heat sink.
C. Snubber circuit.
D. Voltage clamping device.
Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?
A. arcs across separating contacts
B. mechanical noise of high intensity
C. both mechanical noise and arc between contacts
D. none of the above
The stability factor of a collector feedback bias circuit is_______________ that of base resistor bias?
A. The same as
B. More than
C. Less than
D. None of the above
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