Question 1

In which of the following applications variable speed operation is preferred?

Accepted Answer

A) Exhaust fan 
B) Ceiling fan 
C) Refrigerator 
D) Water pump 
A) Exhaust fan 
B) Ceiling fan 
C) Refrigerator 
D) Water pump B

Question 2

The cost of an induction motor will increase as

Accepted Answer

A) Horse power rating increases but rpm decreases 
B) Horse power rating decreases but rpm increases 
C) Horse power rating and operating speed increases 
D) Horse power rating and operating speed decreases 
A) Horse power rating increases but rpm decreases 
B) Horse power rating decreases but rpm increases 
C) Horse power rating and operating speed increases 
D) Horse power rating and operating speed decreases A

Question 3

Ball-bearings are

Accepted Answer

A) Used up to 75 kW motors 
B) Of long life and low friction loss 
C) Costlier and noisy particularly at high speed motor 
D) All of the above 
A) Used up to 75 kW motors 
B) Of long life and low friction loss 
C) Costlier and noisy particularly at high speed motor 
D) All of the above D

Question 4

Hot bearings of a DC motor may be caused by

Accepted Answer

A) Poor ventilation 
B) Incorrect voltage 
C) Loose coupling 
D) Lack of or dirty lubricant 
A) Poor ventilation 
B) Incorrect voltage 
C) Loose coupling 
D) Lack of or dirty lubricant

Question 5

The motor in close are used for collieries, chemical plant is

Accepted Answer

A) Flame proof type 
B) Splash proof type 
C) Totally enclosed type 
D) Pipe ventilated type 
A) Flame proof type 
B) Splash proof type 
C) Totally enclosed type 
D) Pipe ventilated type

Question 6

Which of the following motors has series characteristics?

Accepted Answer

A) Shaded Pole motor 
B) Repulsion motor 
C) Capacitor start motor 
D) None of the above 
A) Shaded Pole motor 
B) Repulsion motor 
C) Capacitor start motor 
D) None of the above

Question 7

For crane travel which off the following motors is normally used?

Accepted Answer

A) Synchronous motor 
B) DC differential compound motor 
C) Ward Leonard controlled DC shunt motor 
D) AC slip ring motor 
A) Synchronous motor 
B) DC differential compound motor 
C) Ward Leonard controlled DC shunt motor 
D) AC slip ring motor

Question 8

The range of ratings of electric motor used for rolling mills is of the order of

Accepted Answer

A) 10 to 25 kW 
B) 25 to 85 kW 
C) 85 to 400 kW 
D) 400 to 1000 kW 
A) 10 to 25 kW 
B) 25 to 85 kW 
C) 85 to 400 kW 
D) 400 to 1000 kW

Question 9

The pair used for frequency converter is

Accepted Answer

A) Squirrel cage induction motor and synchronous motor 
B) Sleep ring induction motor and a synchronous motor 
C) Sleep ring induction motor and squirrel cage induction motor 
D) All of the above 
A) Squirrel cage induction motor and synchronous motor 
B) Sleep ring induction motor and a synchronous motor 
C) Sleep ring induction motor and squirrel cage induction motor 
D) All of the above

Question 10

Sleeve bearings

Accepted Answer

A) Are normally of bronze 
B) Have self lubricating properties 
C) Are used where noise is to be avoided 
D) All of the above 
A) Are normally of bronze 
B) Have self lubricating properties 
C) Are used where noise is to be avoided 
D) All of the above

Question 11

The motor enclosure used for industrial purposes is

Accepted Answer

A) Protected type 
B) Drip proof type 
C) Totally enclosed type 
D) Open type 
A) Protected type 
B) Drip proof type 
C) Totally enclosed type 
D) Open type

Question 12

The characteristics of drive for crane hoisting and lowering are which off the following?

Accepted Answer

A) Precise control 
B) Smooth movement 
C) Fast speed control 
D) All of the above 
A) Precise control 
B) Smooth movement 
C) Fast speed control 
D) All of the above

Question 13

The size of an excavator is usually expressed in terms of

Accepted Answer

A) Crowd motion 
B) Travel in meters 
C) Travel in metres 
D) Angle of swing 
A) Crowd motion 
B) Travel in meters 
C) Travel in metres 
D) Angle of swing

Question 14

Which of the following motors is preferred for boom host of a travelling crane?

Accepted Answer

A) Single phase motor 
B) Synchronous motor 
C) AC slip ring motor 
D) Ward Leonard controlled DC shunt motor 
A) Single phase motor 
B) Synchronous motor 
C) AC slip ring motor 
D) Ward Leonard controlled DC shunt motor

Question 15

The motor enclosure used in wood-working industry is

Accepted Answer

A) Protected type 
B) Totally enclosed fan cooled type 
C) Flame proof type 
D) Splash proof type 
A) Protected type 
B) Totally enclosed fan cooled type 
C) Flame proof type 
D) Splash proof type

Question 16

For very high speed ratio the indispensable drive is

Accepted Answer

A) Direct drive 
B) Rope Drive 
C) Chain drive 
D) Any of the above 
A) Direct drive 
B) Rope Drive 
C) Chain drive 
D) Any of the above

Question 17

For medium duty cranes the short time rating motor used is

Accepted Answer

A) 10 minutes 
B) 15 minutes 
C) 30 minutes 
D) any of the above 
A) 10 minutes 
B) 15 minutes 
C) 30 minutes 
D) any of the above

Question 18

Light duty cranes are generally used in

Accepted Answer

A) Power houses 
B) Pumping stations 
C) Auto mobile workshops 
D) All of the above 
A) Power houses 
B) Pumping stations 
C) Auto mobile workshops 
D) All of the above

Question 19

Speed controlled by variation of field flux results in

Accepted Answer

A) Constant power Drive 
B) Variable power Drive 
C) Constant torture Drive 
D) Variable torque Drive 
A) Constant power Drive 
B) Variable power Drive 
C) Constant torture Drive 
D) Variable torque Drive

Question 20

Which of the following happens when start Delta starter is used ?

Accepted Answer

A) Starting voltage is reduced 
B) Starting current is reduced 
C) None of the above 
D) Both A and B 
A) Starting voltage is reduced 
B) Starting current is reduced 
C) None of the above 
D) Both A and B

In which of the following applications variable speed operation is preferred?

The cost of an induction motor will increase as

Ball-bearings are

Hot bearings of a DC motor may be caused by

The motor in close are used for collieries, chemical plant is

Which of the following motors has series characteristics?

For crane travel which off the following motors is normally used?

The range of ratings of electric motor used for rolling mills is of the order of

The pair used for frequency converter is

Sleeve bearings

The motor enclosure used for industrial purposes is

The characteristics of drive for crane hoisting and lowering are which off the following?

The size of an excavator is usually expressed in terms of

Which of the following motors is preferred for boom host of a travelling crane?

The motor enclosure used in wood-working industry is

For very high speed ratio the indispensable drive is

For medium duty cranes the short time rating motor used is

Light duty cranes are generally used in

Speed controlled by variation of field flux results in

Which of the following happens when start Delta starter is used ?

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

Motor for Various Applications

Motor and Drive System

Electric Motors and Drives: Exploring Speed, Control, and Efficiency

Contactors, Motors, and Load Torques

Electrical Drives and Components

Motors and Drives for Industrial Applications

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

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Exam 5: Motor and Crane Technology: Understanding the Different Types and Applications

In which of the following applications variable speed operation is preferred?

The cost of an induction motor will increase as

Ball-bearings are

Hot bearings of a DC motor may be caused by

The motor in close are used for collieries, chemical plant is

Which of the following motors has series characteristics?

For crane travel which off the following motors is normally used?

The range of ratings of electric motor used for rolling mills is of the order of

The pair used for frequency converter is

Sleeve bearings

The motor enclosure used for industrial purposes is

The characteristics of drive for crane hoisting and lowering are which off the following?

The size of an excavator is usually expressed in terms of

Which of the following motors is preferred for boom host of a travelling crane?

The motor enclosure used in wood-working industry is

For very high speed ratio the indispensable drive is

For medium duty cranes the short time rating motor used is

Light duty cranes are generally used in

Speed controlled by variation of field flux results in

Which of the following happens when start Delta starter is used ?

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

Motor for Various Applications

Motor and Drive System

Electric Motors and Drives: Exploring Speed, Control, and Efficiency

Contactors, Motors, and Load Torques

Electrical Drives and Components

Motors and Drives for Industrial Applications

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

Filters