Multiple choice questions on dc motor # 6

                         Hi friends, this is post about objectives of electrical engineering with emphasis on dc motor check out and comment...

1) The ratio of the starting torque to full load torque is minimum in case of
A) cumulatively compound motors
B) differential compound motors
C) series motors
D) shunt motors

Ans:B

2) The dc motor that draws almost same power at different loads is
A) cumulative compound
B) differential compound
C) series
D) shunt

Ans:C

3) Flywheel is employed with a dc compound dc motor, if the shunt field gets suddenly opened, the motor will
A) level compound
B) differential compound
C) cumulative compound
D) none of these

Ans:C

4) The dc motor, that has poorest speed regulation, is
A) cumulative compound
B) differential compound
C) series
D) shunt

Ans:C

5) When the direction of power flow in a differentially compounded motor reverses, it will operate as a
A) cumulatively compounded generator
B) differentially compounded generator
C) series motor
D) shunt motor

Ans:A

6) In a dc motor, if armature current is increased, keeping field current constant , the torque developed will
A) remain unchanged
B) decrease in inverse proportion
C) increase proportionately
D) increase in proportion to the square of the armature current

Ans:C

7) When a dc cumulative compound wound motor is loaded
A) torque increases and speed decreases
B) torque decreases and speed increases
C) both speed and torque increase
D) both speed and torque decrease

Ans:A

8) Which of the following dc motors, on removal of load, will run at the maximum speed?
A) series
B) shunt
C) cumulative compound
D) differential compound

Ans:A

9) In a differentially compounded dc motor, if the shunt field gets suddenly opened, the motor will
A) first stop and then run in opposite direction as a series motor
B) run as a series motor, but at slower speed in the same direction
C) run as a series motor in the same direction at high speed
D) not work and come to stand still

Ans:A

10) The dc motor most suitable for applications requiring high starting torque is
A) shunt
B) series
C) cumulative compound
D) differential compound

Ans:B

                     If you like my post share it with your friends and subscribe for latest updates...

• Twitter
• Facebook
• Google
• Tumblr
• Pinterest