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.Management Sciences
Category: Electrical Engineering Mcqs
In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
A. as separately wound unit
B. in parallel with armature winding
C. in series with armature winding
D. in parallel with field winding
In squirrel cage induction motors which of the following methods of starting cannot be used ?
A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting
In a simple magnetic field the strength of magnet flux_______________?
A. is constant and has same value in energy part of the magnetic field
B. increases continuously from initial value to final value
C. decreases continuously from initial value to final value
D. first increases and then decreases till it becomes zero
An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
A. 150msec-1
B. 384msec-1
C. 38.4msec-1
D. 200msec-1
The substances which combine together to store electrical energy during the charge are called ________ materials
A. active
B. passive
C. inert
D. dielectric
Ionization in circuit breaker is facilitated by___________?
A. high temperature
B. increase of mean free path
C. increasing field strength
D. all of the above
The use of negative feedback ________________?
A. reduces the voltage gain of an Op-amp
B. makes the Op-amp oscillate
C. makes linear operation possible
D. answers (A) and (B)
The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?
A. increases with number of feed heaters increasing
B. decreases with number of feed heaters increasing
C. remains same unaffected by number of feed heaters
D. none of the above
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