Question 1

Laminations of core are generally made of

Accepted Answer

A) case iron 
B) carbon 
C) silicon steel 
D) stainless steel 
A) case iron 
B) carbon 
C) silicon steel 
D) stainless steel

Question 2

The armature of D.C. generator is laminated to

Accepted Answer

A) reduce the bulk 
B) provide the bulk 
C) insulate the core 
D) reduce eddy current loss 
A) reduce the bulk 
B) provide the bulk 
C) insulate the core 
D) reduce eddy current loss

Question 3

In a four-pole D.C. machine

Accepted Answer

A) all the four poles are north poles 
B) alternate poles are north and south 
C) all the four poles are south poles 
D) two north poles follow two south poles 
A) all the four poles are north poles 
B) alternate poles are north and south 
C) all the four poles are south poles 
D) two north poles follow two south poles

Question 4

Fleming's right-hand rule regarding direction of induced e.m.f., correlates

Accepted Answer

A) magnetic flux, direction of current flow and resultant force 
B) magnetic flux, direction of motion and the direction of e.m.f. induced 
C) magnetic field strength, induced voltage and current 
D) magnetic flux, direction of force and direction of motion of conductor 
A) magnetic flux, direction of current flow and resultant force 
B) magnetic flux, direction of motion and the direction of e.m.f. induced 
C) magnetic field strength, induced voltage and current 
D) magnetic flux, direction of force and direction of motion of conductor

Question 5

Iron losses in a D.C. machine are independent of variations in

Accepted Answer

A) speed 
B) load 
C) voltage 
D) speed and voltage 
A) speed 
B) load 
C) voltage 
D) speed and voltage

Laminations of core are generally made of

The armature of D.C. generator is laminated to

In a four-pole D.C. machine

Fleming's right-hand rule regarding direction of induced e.m.f., correlates

Iron losses in a D.C. machine are independent of variations in

Transformer Fundamentals and Operation

Transformer Technology and Design

Transformer: Resistance, Oil, Relays, Harmonics, and Core Properties

Transformers: Efficiency, Design, and Testing

Transformers: Voltage Regulation, Efficiency, and Protection

Transformer and D.C Motor

D.C Motors and Starters

D.C Motors and Speed Control

D.C Motors and Controls

D.C Motors and Generators

D.C Generators and Commutators

D.C Generator Operation and Construction

D.C Generators

Direct Current Generators and Parallel Operation

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Exam 11: D.C Machine and Generator Laminations, Commutation, and Components

Laminations of core are generally made of

The armature of D.C. generator is laminated to

In a four-pole D.C. machine

Fleming's right-hand rule regarding direction of induced e.m.f., correlates

Iron losses in a D.C. machine are independent of variations in

Transformer Fundamentals and Operation

Transformer Technology and Design

Transformer: Resistance, Oil, Relays, Harmonics, and Core Properties

Transformers: Efficiency, Design, and Testing

Transformers: Voltage Regulation, Efficiency, and Protection

Transformer and D.C Motor

D.C Motors and Starters

D.C Motors and Speed Control

D.C Motors and Controls

D.C Motors and Generators

D.C Generators and Commutators

D.C Generator Operation and Construction

D.C Generators

Direct Current Generators and Parallel Operation

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