Synchronous Motor Objective Question Answer pdf - Set 03 - ObjectiveBooks

Synchronous Motor Objective Question Answer pdf - Set 03

Practice Test: Question Set - 03


1. Synchronizing power of a synchronous machine is
    (A) Directly proportional to the synchronous reactance
    (B) Inversely proportional to the synchronous reactance
    (C) Equal to the synchronous reactance
    (D) None of the above

2. When the voltage applied to a synchronous motor is increased, which of the following will reduce?
    (A) Stator flux
    (B) Pull in torque
    (C) Both (A) and (B)
    (D) None of the above

3. Which of the following methods is used to start a synchronous motor?
    (A) Damper winding
    (B) Star-delta starter
    (C) Damper winding in conjunction with star-delta starter
    (D) Resistance starter in the armature circuit

4. Which of the following motors will be used in electric clocks?
    (A) D.C. shunt motor
    (B) D.C. series motor
    (C) A.C. induction motor
    (D) A.C. synchronous motor

5. Stability of a synchronous machine
    (A) Decreases with increase in its excitation
    (B) Increases with increase in its excitation
    (C) Remains unaffected with increase in excitation
    (D) Any of the above

6. A rotary converter can also be run as a
    (A) D.C. shunt motor
    (B) D.C. series motor
    (C) D.C. compound motor
    (D) Synchronous motor

7. The effect of increasing the load on a synchronous motor running with normal excitation is to
    (A) Decrease both armature current and power factor
    (B) Decrease armature current but increase power factor
    (C) Increase armature current but decrease power factor
    (D) Increase both its armature current and power factor

8. In a synchronous motor, V-curves represent relation between
    (A) Armature current and field current
    (B) Power factor and speed
    (C) Field current and speed
    (D) Field current and power factor

9. In a synchronous motor, the damping winding is generally used to
    (A) Prevent hunting and provide the starting torque
    (B) Reduce the eddy currents
    (C) Provide starting torque only
    (D) Reduce noise level

10. The duration of sudden snort-circuit test on a synchronous motor is usually about
    (A) One hour
    (B) One minute
    (C) One second
    (D) None of the above

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