gate bits practice

Q. The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor at full load speed is
about

1.  50 Hz.
2.  20 Hz.
3.  2 Hz.
4. Zero.

Q. In a stepper motor the angular displacement

1.  can be precisely controlled.
2.  it cannot be readily interfaced with micro computer based controller.
3.  the angular displacement cannot be precisely controlled.
4.  it cannot be used for positioning of work tables and tools in NC machines.

Q.The power factor of a squirrel cage induction motor is

1.  low at light load only.
2.  low at heavy load only.
3.  low at light and heavy load both.
4. low at rated load only.

Q.The generation voltage is usually

1. between 11 KV and 33 KV.
2.  between 132 KV and 400 KV.
3.  between 400 KV and 700 KV.
4.  None of the above.