Question 1

Which of the following is the basic consideration in the design of insulation ?

Accepted Answer

A) Electrical considerations 
B) Mechanical considerations 
C) Thermal considerations 
D) All of the above 
A) Electrical considerations 
B) Mechanical considerations 
C) Thermal considerations 
D) All of the above

Question 2

________ is the common method of applying brushes to the commntator.

Accepted Answer

A) Radial 
B) Trailing 
C) Reaction 
D) All of the above 
A) Radial 
B) Trailing 
C) Reaction 
D) All of the above

Question 3

The high voltage winding is usually which of the following type ?

Accepted Answer

A) Cylindrical winding with circular conductors 
B) Cross-over winding with either circular or small rectangular conductors 
C) Continuous disc type winding with rectangular conductors 
D) All of the above types 
A) Cylindrical winding with circular conductors 
B) Cross-over winding with either circular or small rectangular conductors 
C) Continuous disc type winding with rectangular conductors 
D) All of the above types

Question 4

Which of the following brushes can be used for high values of current density ?

Accepted Answer

A) Metal graphite brushes 
B) Hard carbon brushes 
C) Electro-graphitic brushes 
D) Natural graphite brushes 
A) Metal graphite brushes 
B) Hard carbon brushes 
C) Electro-graphitic brushes 
D) Natural graphite brushes

Question 5

Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?

Accepted Answer

A) Increased I R losses 
B) Increased core losses 
C) Poor commutation 
D) All of the above 
A) Increased I R losses 
B) Increased core losses 
C) Poor commutation 
D) All of the above

Question 6

The laminations of the armature of a D.C. machine are usually _____ thick.

Accepted Answer

A) 0.1 to 0.2 mm 
B) 0.2 to 0.3 mm 
C) 0.3 to 0.4 mm 
D) 0.4 to 0.5 mm 
A) 0.1 to 0.2 mm 
B) 0.2 to 0.3 mm 
C) 0.3 to 0.4 mm 
D) 0.4 to 0.5 mm

Question 7

is usually used for brush rockers

Accepted Answer

A) Mild steel 
B) Copper 
C) Aluminium 
D) Cast-iron 
A) Mild steel 
B) Copper 
C) Aluminium 
D) Cast-iron

Which of the following is the basic consideration in the design of insulation ?

________ is the common method of applying brushes to the commntator.

The high voltage winding is usually which of the following type ?

Which of the following brushes can be used for high values of current density ?

Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?

The laminations of the armature of a D.C. machine are usually _____ thick.

is usually used for brush rockers

Design Considerations and Materials for Electrical Machines

Cooling and Electromagnets for Machines

Transformer Design and Electromagnets

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Exam 4: Design and Operation of DC Machines

Which of the following is the basic consideration in the design of insulation ?

________ is the common method of applying brushes to the commntator.

The high voltage winding is usually which of the following type ?

Which of the following brushes can be used for high values of current density ?

Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?

The laminations of the armature of a D.C. machine are usually _____ thick.

is usually used for brush rockers

Design Considerations and Materials for Electrical Machines

Cooling and Electromagnets for Machines

Transformer Design and Electromagnets

Filters