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Electric Drives
Electric Drives Assessment
Quiz 1
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Q.1
What is the empirical formula for the tractive force required to overcome curve resistance? (W-the weight of the body, R – radius of curvature)
a) 710×W÷R
b) 700×W÷R
c) 720×W÷R
d) 750×W÷R
Q.2
Force resisting the upward motion of a body on an inclined plane is given by (alpha – the angle of inclination, W- the weight of the body).
a) F = W×sin(alpha)
b) F = W×cosec(alpha)
c) F = W×sec(alpha)
d) F = W×cos(alpha)
Q.3
The unit of the torque is ______
a) N-m
b) N-m2
c) N-m/sec
d) N-Hz
Q.4
Calculate the value of the torque whenN force is applied perpendicular to am length of rod fixed at the center.
a) 200 N-m
b) 300 N-m
c) 100 N-m
d) 400 N-m
Q.5
What is the dimensional formula for torque?
a) [ML2T-2]
b) [MLT-2]
c) [M1L2T-3]
d) [LT-2]
Q.6
Buck 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
If the starting torque of the motor is less than the load torque, the motor will fail to start.
a) True
b) False
Q.8
Torque is a scalar quantity.
a) True
b) False
Q.9
250V, 15A,rpm separately excited dc motor with armature resistance (Ra) equal to 2 ohms. Calculate back emf developed in the motor when it operates on half of the full load. (Assume rotational losses are neglected)
a) 210V
b) 240V
c) 230V
d) 235V
0 h : 0 m : 1 s
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