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.Management Sciences
Category: Electrical Engineering Mcqs
An electric field can deflect_______________?
A. Neutrons
B. X-rays
C. Both glass rod and silk acquire a negative charge
D. None
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?
A. a resistance is connected in series with armature
B. a resistance is connected parallel to the armature
C. armature is temporarily open circuited
D. a high value resistor is connected across the field winding
Batteries are charged by_____________?
A. rectifiers
B. engine generator sets
C. motor generator sets
D. any one of the above methods
Each cell has a vent cap________?
A. to allow gases out when the cell is on charge
B. to add water to the cell if needed
C. to check the level of electrolyte
D. to do all above functions
A shunt generator can self-excite:_________________?
A. only if the resistance of the field circuit is less than critical value
B. only if the resistance of the field circuit is greater than critical value
C. irrespective of the value of the resistance in the field circuit
D. none
In a transformer the resistance between its primary and secondary is____________?
A. zero
B. 1 ohm
C. 1000 ohms
D. infinite
Which of the following insulating materials was suitable for low temperature applications ?
A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. Cork
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?
A. Sensitivity
B. Selectivity
C. Distortion
D. Fidelity
In an actual transformer the iron loss remains practically constant from no load to full load because:____________?
A. value of transformation ratio remains constant
B. permeability of transformer core remains constant
C. core flux remains practically constant
D. primary voltage remains constant
C. secondary voltage remains constant
The operating voltage of high voltage cables is up to_______________?
A. l.lkV
B. 3.3kV
C. 6.6kV
D. llkV
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