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For the following questions answer them individually
Which single phase motor would you select for a tape recorder?
Reluctance motor
Hysteresis motor
Synchronous motor
Universal motor
The direction of rotation of an hysteresis motor is determined by
interchanging the supply leads
position of shaded pole with respect to main pole
retentivity of the rotor material
none of these
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______.
improve power factor
increase overload capacity
reduce fluctuations in torque
to improve torque
The purpose of stator winding in the compensated repulsion motor is to
provide mechanical balance
improve power factor and provide better speed regulation
prevent hunting in the motor
eliminate armature reaction
A hysteresis motor works on the principle of
hysteresis loss
magnetisation of rotor
eddy current loss
electromagnetic induction
Torque developed by a single phase induction motor at starting is
pulsating
uniform
Non-uniform
zero
What are the advantages of DC transmission system over AC transmission system?
DC system is economical
There is no skin effect in DC system
Corona limits are highest for DC circuits as compared to AC circuits
All options are correct
The high voltage line which feeds the substations, distribution transformers represent
primary transmission
secondary transmission
primary distribution
secondary distribution
Which of the following is not a standard transmission voltage?
132kV
222kV
400kV
750kV
Dielectric strength of rubber is around
3 kV/mm
10 kV/mm
30 kV/mm
300 kV/mm
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