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
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