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.Management Sciences
Category: Electrical Engineering Mcqs
The insulation of the cable decreases with__________?
A. the increase in length of the insulation
B. the decrease in the length of the insulation
C. either A. or (b)
D. none of the above
Slip rings are usually made of__________?
A. carbon or graphite
B. brass or steel
C. silver or gold
D. copper or aluminium
Hysteresis motor is particularly useful for high-quality record players and tape-recorders because___________?
A. it revolves synchronously
B. it is not subject to any magnetic or mechanical vibrations
C. it can be easily manufactured in extremely small sizes of up to 1 W output
D. it develops hysteresis torque which is extremely steady both in amplitude and phase
Heat transfer by condition will not occur when____________?
A. bodies are kept in vacuum
B. bodies are immersed in water
C. bodies are exposed to thermal radiations
D. temperatures of the two bodies are identical
For starting a D.C. motor a starter is required because___________?
A. it limits the speed of the motor
B. it limits the starting current to a safe value
C. it starts the motor
D. none of the above
The number of Faraday tubes of flux passing through a surface in an electric field is called____________?
A. electric flux
B. electric flux density
C. magnetic flux density
D. electric charge density
Instrument transformers are_______________?
A. potential transformers
B. current transformers
C. both A. and B.
D. power transformers
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
A. synchronous motor has no slip
B. stator supply is not required to produce magnetic field
C. mechanical load on the rotor remains constant
D. synchronous motor has large airgap
Which of the following statements is not necessarily correct for open control system ?
A. Input command is the sole factor responsible for providing the control action
B. Presence of non-linearities causes malfunctioning
C. Less expensive
D. Generally free from problems of non-linearities
If firing angle in an SCR circuit is increased, the output _____________?
A. Remains the same
B. Is increased
C. Is decreased
D. None of the above
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