Question 1

In overhead traveling cranes

Accepted Answer

A) continuous duty motors are used 
B) slow speed motors are preferred 
C) short time rated motors arc preferred 
D) none of the above. 
A) continuous duty motors are used 
B) slow speed motors are preferred 
C) short time rated motors arc preferred 
D) none of the above. C

Question 2

As compared to squirrel cage induction motor, a wound rotor induction motor is preferred when the major consideration is

Accepted Answer

A) high starting torque 
B) low windage losses 
C) slow speed operation 
D) all of the above. 
A) high starting torque 
B) low windage losses 
C) slow speed operation 
D) all of the above. A

Question 3

A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for

Accepted Answer

A) lifting 
B) hoisting 
C) lowering 
D) landing the load. 
A) lifting 
B) hoisting 
C) lowering 
D) landing the load. A

Question 4

Motors preferred for rolling mill drive is

Accepted Answer

A) dc motors 
B) ac slip ring motors with speed control 
C) any of the above 
D) none of the above. 
A) dc motors 
B) ac slip ring motors with speed control 
C) any of the above 
D) none of the above.

Question 5

When smooth and precise speed control over a wide range is desired, the motor preferred is

Accepted Answer

A) synchronous motor 
B) squirrel cage induction motor 
C) wound rotor induction motor 
D) dc motor. 
A) synchronous motor 
B) squirrel cage induction motor 
C) wound rotor induction motor 
D) dc motor.

Question 6

A synchronous motor is found to be more economical when the load is above

Accepted Answer

A) 1 kW 
B) 10 kW 
C) 20 kW 
D) 100kW. 
A) 1 kW 
B) 10 kW 
C) 20 kW 
D) 100kW.

Question 7

For handing fragile articles in a crane

Accepted Answer

A) low speed is preferred 
B) medium speed is preferred 
C) high speed is preferr 
A) low speed is preferred 
B) medium speed is preferred 
C) high speed is preferr

Question 8

In case of traveling cranes, the motor preferred for boom hoist is

Accepted Answer

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

Question 9

Stator voltage control for speed control of induction motors is suitable for

Accepted Answer

A) fan and pump drives 
B) drive of a crane 
C) running it as generator 
D) constant load drive. 
A) fan and pump drives 
B) drive of a crane 
C) running it as generator 
D) constant load drive.

Question 10

The capacity of a crane is expressed in terms of

Accepted Answer

A) Span 
B) Type of drive 
C) Tonnes 
A) Span 
B) Type of drive 
C) Tonnes

Question 11

A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for

Accepted Answer

A) lifting 
B) hoisting 
C) lowering 
D) landing the load. 
A) lifting 
B) hoisting 
C) lowering 
D) landing the load.

Question 12

Which of the following drive can be used for derricks and winches ?

Accepted Answer

A) DC motors with Ward Leonard control 
B) AC slip-ring motors with variable resistance 
C) Pole changing squirrel cage motors 
A) DC motors with Ward Leonard control 
B) AC slip-ring motors with variable resistance 
C) Pole changing squirrel cage motors

Question 13

1/2 hour rated motors are used for

Accepted Answer

A) light duty cranes 
B) medium duty cranes 
C) heavy duty cranes 
D) none of the above. 
A) light duty cranes 
B) medium duty cranes 
C) heavy duty cranes 
D) none of the above.

Question 14

The advantage of a synchronous motor in addition to its constant speed is

Accepted Answer

A) high power factor 
B) better efficiency 
C) lower cost 
D) all of the above. 
A) high power factor 
B) better efficiency 
C) lower cost 
D) all of the above.

Question 15

The characteristics of drive for. crane hoisting and lowering is

Accepted Answer

A) smooth movement 
B) precise control 
C) fast speed control 
D) all of the above. 
A) smooth movement 
B) precise control 
C) fast speed control 
D) all of the above.

Question 16

Heavy duty cranes are used in

Accepted Answer

A) Heavy engineering workshops 
B) Steel plants 
C) Ore handling plants 
D) All of the above. 
A) Heavy engineering workshops 
B) Steel plants 
C) Ore handling plants 
D) All of the above.

Question 17

Light duty cranes are generally used in

Accepted Answer

A) automobile workshops 
B) pumping stations 
C) power houses 
D) All of the above. 
A) automobile workshops 
B) pumping stations 
C) power houses 
D) All of the above.

Question 18

The traveling speed of cranes varies from

Accepted Answer

A) 1 to 2.5 m/s 
B) 5 to 15 m/s 
C) 20 to 22.5 m/s 
D) 25 to 40 m/s. 
A) 1 to 2.5 m/s 
B) 5 to 15 m/s 
C) 20 to 22.5 m/s 
D) 25 to 40 m/s.

Question 19

The selection of control gear for a particular application is based on the consideration of

Accepted Answer

A) duty 
B) starting torque 
C) limitations on starting current 
D) all of the above. 
A) duty 
B) starting torque 
C) limitations on starting current 
D) all of the above.

Question 20

When quick speed reversal is a consideration, the motor preferred is

Accepted Answer

A) synchronous motor 
B) squirrel cage induction motor 
C) wound rotor induction motor 
D) dc motor. 
A) synchronous motor 
B) squirrel cage induction motor 
C) wound rotor induction motor 
D) dc motor.

In overhead traveling cranes

As compared to squirrel cage induction motor, a wound rotor induction motor is preferred when the major consideration is

A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for

Motors preferred for rolling mill drive is

When smooth and precise speed control over a wide range is desired, the motor preferred is

A synchronous motor is found to be more economical when the load is above

For handing fragile articles in a crane

In case of traveling cranes, the motor preferred for boom hoist is

Stator voltage control for speed control of induction motors is suitable for

The capacity of a crane is expressed in terms of

A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for

Which of the following drive can be used for derricks and winches ?

1/2 hour rated motors are used for

The advantage of a synchronous motor in addition to its constant speed is

The characteristics of drive for. crane hoisting and lowering is

Heavy duty cranes are used in

Light duty cranes are generally used in

The traveling speed of cranes varies from

The selection of control gear for a particular application is based on the consideration of

When quick speed reversal is a consideration, the motor preferred is

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Exam 9: Motors and Drives for Industrial Applications

In overhead traveling cranes

As compared to squirrel cage induction motor, a wound rotor induction motor is preferred when the major consideration is

A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for

Motors preferred for rolling mill drive is

When smooth and precise speed control over a wide range is desired, the motor preferred is

A synchronous motor is found to be more economical when the load is above

For handing fragile articles in a crane

In case of traveling cranes, the motor preferred for boom hoist is

Stator voltage control for speed control of induction motors is suitable for

The capacity of a crane is expressed in terms of

A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for

Which of the following drive can be used for derricks and winches ?

1/2 hour rated motors are used for

The advantage of a synchronous motor in addition to its constant speed is

The characteristics of drive for. crane hoisting and lowering is

Heavy duty cranes are used in

Light duty cranes are generally used in

The traveling speed of cranes varies from

The selection of control gear for a particular application is based on the consideration of

When quick speed reversal is a consideration, the motor preferred is

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

Motor for Various Applications

Motor and Drive System

Motor and Crane Technology: Understanding the Different Types and Applications

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

Contactors, Motors, and Load Torques

Electrical Drives and Components

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

Filters