Question 1

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 above 
A) Lower cost 
B) Better efficiency 
C) High power factor 
D) All of the above C

Question 2

Which of the following types of motor enclosure is safest ?

Accepted Answer

A) Totally enclosed 
B) Totally enclosed fan cooled 
C) Open type 
D) Semi closed 
A) Totally enclosed 
B) Totally enclosed fan cooled 
C) Open type 
D) Semi closed B

Question 3

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

Accepted Answer

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

Question 4

The travelling speed of cranes varies from

Accepted Answer

A) 20 to 30 m/s 
B) 10 to 15 m/s 
C) 5 to 10 m/s 
D) 1 to 2.5 m/s 
A) 20 to 30 m/s 
B) 10 to 15 m/s 
C) 5 to 10 m/s 
D) 1 to 2.5 m/s

Question 5

The characteristics of drive for crane hoisting and lowering are which of 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 6

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 above 
A) Tapped field control 
B) Diverter field control 
C) Series-parallel control 
D) Any of the above

Question 7

For a D.C. shunt motor which of the following is incorrect 7

Accepted Answer

A) Unsuitable for heavy duty starting 
B) Torque varies as armature current 
C) Torque-armature current is a straight line 
D) Torque is zero for zero armature current 
A) Unsuitable for heavy duty starting 
B) Torque varies as armature current 
C) Torque-armature current is a straight line 
D) Torque is zero for zero armature current

Question 8

The diameter of the rotor shaft for an electric motor depends on which of the following ?

Accepted Answer

A) r.p.m.only 
B) Horse power only 
C) Horse power and r.p.m. 
D) Horse power, r.p.m.and power factor 
A) r.p.m.only 
B) Horse power only 
C) Horse power and r.p.m. 
D) Horse power, r.p.m.and power factor

Question 9

The capacity of a crane is expressed in terms of

Accepted Answer

A) type of drive 
B) span 
C) tonnes 
D) any of the above 
A) type of drive 
B) span 
C) tonnes 
D) any of the above

Question 10

A reluctance motor........

Accepted Answer

A) Is provided with slip rings 
B) Requires starting gear 
C) Has high cost 
D) Is compact 
A) Is provided with slip rings 
B) Requires starting gear 
C) Has high cost 
D) Is compact

Question 11

Which of the following happens when star-delta starter is used ?

Accepted Answer

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

Question 12

The load cycle for a motor driving a power press will be .........

Accepted Answer

A) Variable load 
B) Continuous 
C) Continuous but periodical 
D) Intermittent and variable load 
A) Variable load 
B) Continuous 
C) Continuous but periodical 
D) Intermittent and variable load

Question 13

The size of an excavator is usually expressed in terms of

Accepted Answer

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

Question 14

Word Leonard controlled DC Drives are generally used for..... excavators

Accepted Answer

A) Light duty 
B) Medium duty 
C) Heavy duty 
D) All of the above 
A) Light duty 
B) Medium duty 
C) Heavy duty 
D) All of the above

Question 15

Which of the following motors is preferred when quick speed reversal is the main consideration?

Accepted Answer

A) Squirrel cage induction motor 
B) Wound rotor induction motor 
C) Synchronous motor 
D) D.C.motor 
A) Squirrel cage induction motor 
B) Wound rotor induction motor 
C) Synchronous motor 
D) D.C.motor

Question 16

By the use of which of the followingm D.C. can be obtained from AC?

Accepted Answer

A) Silicon diodes 
B) Mercury arc rectifier 
C) Motor generator set 
D) Any of the above 
A) Silicon diodes 
B) Mercury arc rectifier 
C) Motor generator set 
D) Any of the above

Question 17

Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?

Accepted Answer

A) D.C.motor 
B) Squirrel cage induction motor 
C) Wound rotor induction motor 
D) Synchronous motor 
A) D.C.motor 
B) Squirrel cage induction motor 
C) Wound rotor induction motor 
D) Synchronous motor

Question 18

Which of the following alternatives will be cheaper ?

Accepted Answer

A) A 100 H.P.AC.three phase motor 
B) Four motors of 25 H.P.each 
C) Five motors of 20 H.P.each 
D) Ten motors of 10 H.P.each 
A) A 100 H.P.AC.three phase motor 
B) Four motors of 25 H.P.each 
C) Five motors of 20 H.P.each 
D) Ten motors of 10 H.P.each

Question 19

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

Accepted Answer

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

Question 20

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

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

Which of the following types of motor enclosure is safest ?

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

The travelling speed of cranes varies from

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

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

For a D.C. shunt motor which of the following is incorrect 7

The diameter of the rotor shaft for an electric motor depends on which of the following ?

The capacity of a crane is expressed in terms of

A reluctance motor........

Which of the following happens when star-delta starter is used ?

The load cycle for a motor driving a power press will be .........

The size of an excavator is usually expressed in terms of

Word Leonard controlled DC Drives are generally used for..... excavators

Which of the following motors is preferred when quick speed reversal is the main consideration?

By the use of which of the followingm D.C. can be obtained from AC?

Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?

Which of the following alternatives will be cheaper ?

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

Which of the following motors has series characteristics ?

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

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

Motors and Drives for Industrial Applications

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

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Exam 3: Motor for Various Applications

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

Which of the following types of motor enclosure is safest ?

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

The travelling speed of cranes varies from

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

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

For a D.C. shunt motor which of the following is incorrect 7

The diameter of the rotor shaft for an electric motor depends on which of the following ?

The capacity of a crane is expressed in terms of

A reluctance motor........

Which of the following happens when star-delta starter is used ?

The load cycle for a motor driving a power press will be .........

The size of an excavator is usually expressed in terms of

Word Leonard controlled DC Drives are generally used for..... excavators

Which of the following motors is preferred when quick speed reversal is the main consideration?

By the use of which of the followingm D.C. can be obtained from AC?

Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?

Which of the following alternatives will be cheaper ?

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

Which of the following motors has series characteristics ?

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

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

Motors and Drives for Industrial Applications

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

Filters