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