Practice Test: Question Set - 04
1. In a differentially compounded D.C. motor, if shunt field suddenly opens
- (A) The motor will first stop and then run in opposite
direction as series motor
- (B) The motor will work as series motor and run at slow
speed in the same direction
- (C) The motor will work as series motor and run at high
speed in the same direction
- (D) The motor will not work and come to stop
2. The speed of a D.C. shunt motor can be increased by
- (A) Increasing the resistance in armature circuit
- (B) Increasing the resistance in field circuit
- (C) Reducing the resistance in the field circuit
- (D) Reducing the resistance in the armature circuit
3. The plugging gives the
- (A) Zero torque braking
- (B) Smallest torque braking
- (C) Highest torque braking
- (D) None of the above
4. For constant torque drive which speed control method is preferred?
- (A) Field control
- (B) Armature voltage control
- (C) Shunt armature control
- (D) Mechanical loading system
5. In a manual shunt motor starter
- (A) Over load relay is connected in series and no volt
relay in parallel with the load
- (B) Over load relay is connected in parallel and no
volt relay in series with the load
- (C) Over load relay and no volt relay are both connected
in series with the load
- (D) Over load relay and no volt relay are both
connected in parallel with the load
6. In variable speed motor
- (A) A stronger commutating field is needed at low speed
than at high speed
- (B) A weaker commutating field is needed at low speed
than at high speed
- (C) Same commutating field is needed at low speed than
at high speed
- (D) None of the above is correct
7. Which of the following application requires high starting torque?
- (A) Lathe machine
- (B) Centrifugal pump
- (C) Locomotive
- (D) Air blower
8. The type of D.C. motor used for shears and punches is
- (A) Shunt motor
- (B) Series motor
- (C) Differential computed D.C. motor
- (D) Cumulative compound D.C. motor
9. In which of the following applications D.C. series motor is invariably tried?
- (A) Starter for a car
- (B) Drive for a water pump
- (C) Fan motor
- (D) Motor operation in A.C. or D.C.
10. For the same H.P. rating and full load speed, following motor has poor starting torque
- (A) Shunt
- (B) Series
- (C) Differentially compounded
- (D) Cumulatively compounded
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