Related Questions

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
ক remain same
খ go down
গ improve
ঘ none of the above
The speed regulation of a synchronous motor is always
ক 1%
খ 0.5%
গ positive
ঘ zero
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
ক inductor motor torque
খ induction generator torque
গ synchronous motor torque
ঘ d.c. motor toque
A synchronous motor can be used as a synchronous capacitor when it is
ক under-loaded
খ over-loaded
গ under-excited
ঘ over-excited
A synchronous motor can develop synchronous torque
ক when under loaded
খ while over-excited
গ only at synchronous speed
ঘ below or above synchronous speed
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will
ক Become unstable
খ Draw excessive armature current and may burn out
গ Fall out of synchronism and come to stand still
ঘ Run as induction motor
a motor -cycle covers 40 Km with a speed of 20 km /hr. Find the speed of the motor -cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km / hr.
ক 70.0km /hr
খ 52.5km /hr
গ 60.0km/hr
ঘ 60. 5 km / hr
A motor cycle covers 40 km with a speed of 20 km/hr. Find the speed of the motor cycle for the next 40 km journy so that the average speed of the whole journey will be 30 km/hr?
ক 70
খ 52.5
গ 60
ঘ 60.5
While starting a synchronous motor by induction motor action, field winding is usually
ক connected to D.C. supply
খ short-circuited by low resistance
গ kept open-circuited
ঘ none of the above
A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased
ক power factor as well as armature current will decrease
খ power factor as well as armature current will increase
গ power factor will increase but armature current will decrease
ঘ power factor will decrease and armature current will increase

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