DC Motors Objective Type Questions - Set 04 - ObjectiveBooks
DC Motors Objective Type Questions - Set 04

DC Motors Objective Type Questions - Set 04

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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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