Question 1

In........ method of starting three phase induction motors the starting voltage is not reduced

Accepted Answer

A)  Auto transformer
B)  Star Delta
C)  Slip ring
D)  Any of the aboveE) A) and B)
F) A) and C)

Question 2

Which off the following motors is used for elevators?

Accepted Answer

A)  Induction motor
B)  Synchronous motor
C)  Capacitor start single phase motor
D)  Any of the aboveE) A) and B)
F) B) and C)

Question 3

Which feature while selecting a motor for centrifugal pump will be of least significance?

Accepted Answer

A)  Starting characteristics
B)  Operating speed
C)  Horse power
D)  Speed controlE) All of the above
F) A) and B)

Question 4

An elevator Drive is required to operate in

Accepted Answer

A)  One quadrant only
B)  Two quadrants
C)  Three quadrants
D)  Four quadrantsE) A) and B)
F) A) and C)

Question 5

Rotor of the motor is usually supported on........... bearings

Accepted Answer

A)  Ball or roller
B)  Needle
C)  Thrust
D)  BushE) C) and D)
F) A) and B)

Question 6

Which of the following alternatives will be cheaper ?

Accepted Answer

A)  A 100 HP ac three phase motor
B)  Four motors of 25 HP each
C)  Five motors of 20 HP each
D)  10 motors of 10 HP eachE) B) and C)
F) A) and D)

Question 7

Which of the following types of motor and enclosure is safest

Accepted Answer

A)  Totally enclosed
B)  Totally enclosed fan cooled
C)  Open time
D)  Semi closedE) None of the above
F) A) and B)

Question 8

Belt conveyors offer ..........starting torque

Accepted Answer

A)  High
B)  Low
C)  Medium
D)  ZeroE) None of the above
F) All of the above

Question 9

........has least range of speed control

Accepted Answer

A)  Slip ring induction motor
B)  Synchronous motor
C)  DC shunt motor
D)  Schrage motorE) None of the above
F) All of the above

Question 10

........ has relatively wider range of speed control

Accepted Answer

A)  Synchronous motor
B)  Slip ring induction motor
C)  Squirrel case induction motor
D)  DC shunt motorE) B) and D)
F) None of the above D

Question 11

In series motor which of the following methods can be used for changing the flux per pole?

Accepted Answer

A)  Tapped field control
B)  Diverter field control
C)  Series-parallel control
D)  Any of the aboveE) A) and B)
F) B) and D) D

Question 12

In jaw crushers a motor has to often start against....... load

Accepted Answer

A)  Heavy
B)  Medium
C)  Normal
D)  LowE) A) and B)
F) A) and D)

Question 13

While selecting an electric motor for a floor Mill, which electrical characteristics will be of least significance ?

Accepted Answer

A)  Running characteristics
B)  Starting characteristics
C)  Efficiency
D)  BreakingE) C) and D)
F) B) and C)

Question 14

While selecting a motor for air-conditioner the feature of utmost importance is

Accepted Answer

A)  Type of enclosure
B)  Type of bearing
C)  Noise
D)  Power transmission arrangementE) B) and C)
F) A) and B)

Question 15

........is not a part of ball bearing

Accepted Answer

A)  Inner race
B)  Outer race
C)  Cage
D)  BushE) B) and C)
F) None of the above

Question 16

Besides a constant speed a synchronous rotor possesses which of the following advantages ?

Accepted Answer

A)  Lower cost
B)  Better efficiency
C)  High power factor
D)  All of the aboveE) A) and D)
F) B) and C)

Question 17

For which off the following applications DC motors are still preferred?

Accepted Answer

A)  High operation
B)  Variable speed drive
C)  High starting torque
D)  ReversibilityE) B) and C)
F) C) and D)

Question 18

Heat control switches are used in

Accepted Answer

A)  Transformers
B)  Cooling ranges
C)  Three phase induction motors
D)  Single faceE) B) and C)
F) A) and B) B

Question 19

A pony motor is used for the starting which of the following motors ?

Accepted Answer

A)  Squirrel cage induction motor
B)  Schrage motor
C)  Synchronous motor
D)  None of the aboveE) None of the above
F) All of the above

Question 20

.............method of starting a three phase induction motor needs six terminals

Accepted Answer

A)  Resistance starting
B)  Auto transformer
C)  None of the above
D)  Star deltaE) None of the above
F) B) and C)

Exam 4: Motor and Drive System

In........ method of starting three phase induction motors the starting voltage is not reduced

Correct AnswerverifiedShow Answer

Which off the following motors is used for elevators?

Correct AnswerverifiedShow Answer

Which feature while selecting a motor for centrifugal pump will be of least significance?

Correct AnswerverifiedShow Answer

An elevator Drive is required to operate in

Correct AnswerverifiedShow Answer

Rotor of the motor is usually supported on........... bearings

Correct AnswerverifiedShow Answer

Which of the following alternatives will be cheaper ?

Correct AnswerverifiedShow Answer

Which of the following types of motor and enclosure is safest

Correct AnswerverifiedShow Answer

Belt conveyors offer ..........starting torque

Correct AnswerverifiedShow Answer

........has least range of speed control

Correct AnswerverifiedShow Answer

........ has relatively wider range of speed control

Correct AnswerverifiedD

In series motor which of the following methods can be used for changing the flux per pole?

Correct AnswerverifiedD

In jaw crushers a motor has to often start against....... load

Correct AnswerverifiedShow Answer

While selecting an electric motor for a floor Mill, which electrical characteristics will be of least significance ?

Correct AnswerverifiedShow Answer

While selecting a motor for air-conditioner the feature of utmost importance is

Correct AnswerverifiedShow Answer

........is not a part of ball bearing

Correct AnswerverifiedShow Answer

Besides a constant speed a synchronous rotor possesses which of the following advantages ?

Correct AnswerverifiedShow Answer

For which off the following applications DC motors are still preferred?

Correct AnswerverifiedShow Answer

Heat control switches are used in

Correct AnswerverifiedB

A pony motor is used for the starting which of the following motors ?

Correct AnswerverifiedShow Answer

.............method of starting a three phase induction motor needs six terminals

Correct AnswerverifiedShow Answer

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D

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D

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B

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