1. . A major advantage of electric traction is:
(A) Power failure for few minutes
(B) High initial cost
(C) High starting torque
(D) Interference in communication
2. . Single phase AC traction system uses voltages:
(A) 33KV
(B) 15–25KV
(C) 10KV
(D) 66KV
3. . DC series motor is widely suitable for traction purpose because of:
(A) High starting torque
(B) All of these
(C) Ta = I²a
(D) Simple construction
4. . BLDC motor is also called:
(A) Fieldless DC motor
(B) Commutatorless DC motor
(C) Windingless DC motor
(D) None of these
5. . In series-parallel speed control method of DC series motor we can achieve:
(A) Variable speed
(B) 2-step speed (low or high)
(C) Minimum to maximum speed
(D) Smooth speed
6. . In field weakening speed control method of DC series motor, a rheostat is connected:
(A) Parallel to the armature
(B) Series to the series field
(C) Series to the armature
(D) Parallel to the series field
7. . A suitable manual controller where frequent starting, varying speed and reversing are necessary is:
(A) Series-parallel controller
(B) Drum controller
(C) Tapped field controller
(D) Rheostat controller
8. . Brake by plugging can be applied to the DC motor by reversing the current through:
(A) B or C
(B) Armature only
(C) Field only
(D) Armature and field
9. . In this braking method, armature of DC shunt motor is disconnected from main supply and connected with external resistance:
(A) Rheostat
(B) Plugging
(C) Regenerative
(D) All of the above
10. . Most modern electric vehicles use:
(A) Nickel Metal Hydride batteries
(B) Lead acid batteries
(C) Lithium-ion type batteries
(D) Both a & b