Q.1
Regenerative braking mode can be achieved in which quadrant (V-I curve)?
  • a) Third
  • b) Second
  • c) Fourth
  • d) First
Q.2
Fan type of loads exhibits which type of load torque characteristics?
  • a) Constant torque characteristics
  • b) Linearly rising torque characteristics
  • c) Non-Linearly rising torque characteristics
  • d) Non-Linearly decreasing torque characteristics
Q.3
Type-A chopper is used for obtaining which type of mode?
  • a) Motoring mode
  • b) Regenerative braking mode
  • c) Reverse motoring mode
  • d) Reverse regenerative braking mode
Q.4
Calculate the value of angular acceleration of motor using the given data: J =kg-mload torque =N-m, motor torque =N-m.
  • a) 5 rad/s2
  • b) 2 rad/s2
  • c) 3 rad/s2
  • d) 4 rad/s2
Q.5
230V, 10A, 1500rpm DC separately excited motor having resistance of .2 ohm excited from external dc voltage source of 50V. Calculate the torque developed by the motor on full load.
  • a) 13.89 N-m
  • b) 14.52 N-m
  • c) 13.37 N-m
  • d) 14.42 N-m
Q.6
Boost converter is used to _________
  • a) Step down the voltage
  • b) Step up the voltage
  • c) Equalize the voltage
  • d) Step up and step down the voltage
Q.7
Reverse motoring mode is available in fourth quadrant.
  • a) True
  • b) False
Q.8
Calculate the power developed by motor using the given data: Eb =and I =A. (Assume rotational losses are neglected)
  • a) 400 W
  • b) 200 W
  • c) 300 W
  • d) 500 W
Q.9
Which one is an example of variable loss?
  • a) Windage loss
  • b) Hysteresis loss
  • c) Armature copper loss
  • d) Friction loss
0 h : 0 m : 1 s