Industrial Drives Mcqs - Set 6

1)   Which of the following motors is used for elevators ?

a. Induction motor
b. Synchronous motor
c. Capacitor start single phase motor
d. Any of the above
Answer  Explanation 

ANSWER: Induction motor

Explanation:
No explanation is available for this question!


2)   ________________ motor is a constant speed motor?

a. Synchronous motor
b. Schrage motor
c. Induction motor
d. Universal motor
Answer  Explanation 

ANSWER: Synchronous motor

Explanation:
No explanation is available for this question!


3)   The starting torque of a D.C. motor is independent of which of the following?

a. Flux
b. Armature current
c. Flux and armature current
d. Speed
Answer  Explanation 

ANSWER: Speed

Explanation:
No explanation is available for this question!


4)   need frequent starting and stopping of electric motors ?

a. Paper mills
b. Grinding mills
c. Air-conditioners
d. Lifts and hoists
Answer  Explanation 

ANSWER: Lifts and hoists

Explanation:
No explanation is available for this question!


5)   Which of the following motors are best for the rolling mills ?

a. Single phase motors
b. Squirrel cage induction motors
c. Slip ring induction motors
d. D.C. motors
Answer  Explanation 

ANSWER: D.C. motors

Explanation:
No explanation is available for this question!


6)   For which of the following applications D.C. motors are still preferred ?

a. High efficiency operation
b. Reversibility
c. Variable speed drive
d. High starting torque
Answer  Explanation 

ANSWER: Variable speed drive

Explanation:
No explanation is available for this question!


7)   ___________________is not a part of ball bearing ?

a. Inner race
b. Outer race
c. Cage
d. Bush
Answer  Explanation 

ANSWER: Bush

Explanation:
No explanation is available for this question!


8)   The starting torque in case of centrifugal pumps is generally_________________?

a. less than running torque
b. same as running torque
c. slightly more than running torque
d. double the running torque
Answer  Explanation 

ANSWER: less than running torque

Explanation:
No explanation is available for this question!


9)   Which part of a motor needs maximum attention for maintenance ?

a. Frame
b. Rearing
c. Stator winding
d. Rotor winding
Answer  Explanation 

ANSWER: Rearing

Explanation:
No explanation is available for this question!


10)   Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?

a. Starting characteristics
b. Operating speed
c. Horse power
d. Speed control
Answer  Explanation 

ANSWER: Speed control

Explanation:
No explanation is available for this question!