Related Questions

It is advisable to avoid line starting of induction motor and use starter because
A It will run in reverse direction
B It will pick up very high speed and may go out of step
C Motor takes five to seven times its full load current
D Starting torque is very high
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
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 coils of D.C. motor starter are wound with wire of
A Copper
B Kanthal
C Manganin
D Nichrome
In a manual shunt motor starter
A Over load relay is connected in series and no volt relay in parallel with the load
B Over load relay is connected in parallel and no volt relay in series with the load
C Over load relay and no volt relay are both connected in series with the load
D Over load relay and no volt relay are both connected in parallel with the load
The starter motor is driven by
A Chain drive
B Gear drive
C Flat belt drive
D V-belt drive
While starting a synchronous motor by induction motor action, field winding is usually
A connected to D.C. supply
B short-circuited by low resistance
C kept open-circuited
D none of the above
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
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
Slip ring motor is preferred over squirrel cage induction motor where
A High starting torque is required
B Load torque is heavy
C Heavy pull out torque is required
D All of the above

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