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Month: December 2018

Dummy coil should not be used in_________________?

August 11, 2021December 22, 2018 by admin
Dummy coil should not be used in_________________?

A. small machines
B. large machines
C. either A. or B.
D. none of the above

Categories Electrical Machine Design

Power transformers should be designed to have maximum efficiency________________?

August 11, 2021December 22, 2018 by admin
Power transformers should be designed to have maximum efficiency________________?

A. at one-fourth load
B. at one-half load
C. at or near full load
D. any of the above

Categories Electrical Machine Design

Yokes with rectangular cross-section are used for_______________?

August 11, 2021December 22, 2018 by admin
Yokes with rectangular cross-section are used for_______________?

A. small capacity transformers
B. medium capacity transformers
C. large capacity transformers
D. any of the above

Categories Electrical Machine Design

Which of the following methods is most accurate ?

August 11, 2021December 22, 2018 by admin
Which of the following methods is most accurate ?

A. Equivalent current method
B. Equivalent power method
C. Equivalent torque method
D. Method of average losses

Categories Electrical Machine Design

____________are used for construction of core of electromagnets?

August 11, 2021December 22, 2018 by admin
____________are used for construction of core of electromagnets?

A. Soft magnetic materials
B. Hard magnetic materials
C. Either A. or B.
D. None of the above

Categories Electrical Machine Design

Tractive magnets are operated from____________?

August 11, 2021December 22, 2018 by admin
Tractive magnets are operated from____________?

A. a.c. supply
B. d.c. supply
C. either a.c. or d.c. supply
D. none of the above

Categories Electrical Machine Design

Which of the following is the commonly used type of electromagnets ?

August 11, 2021December 22, 2018 by admin
Which of the following is the commonly used type of electromagnets ?

A. Flat-faced armature type
B. Horse shoe type
C. Flat-faced plunger type
D. All of the above

Categories Electrical Machine Design

The design of electromagnets is based upon which of the following fundamental equations ?

August 11, 2021December 22, 2018 by admin
The design of electromagnets is based upon which of the following fundamental equations ?

A. Force equation
B. Magnetic circuit equation
C. Heating equation
D. Voltage equation
E. All of the above

Categories Electrical Machine Design

electromagnets generally function as holding magnets ?

August 11, 2021December 22, 2018 by admin
electromagnets generally function as holding magnets ?

A. Tractive
B. Portative
C. Either of the above
D. None of the above

Categories Electrical Machine Design

By which of the following methods motor rating for variable load drives can be determined ?

August 11, 2021December 22, 2018 by admin
By which of the following methods motor rating for variable load drives can be determined ?

A. Method of average losses
B. Equivalent current method
C. Equivalent torque method
D. Equivalent power method
E. All of the above

Categories Electrical Machine Design
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