Hi friends, these are some of the multiple choice questions on electrical and magnetic properties. These are some of the basic questions which are asked in previous competitive papers check out and comment...
1) Another term for corona discharge.
A) Lightning
B) Sparking
C) Aurora
D) Corona Effect
Ans:C
2) The B-H curve for is a straight line passing through the origin.
A) cobalt
B) air
C) hardened steel
D) soft iron
Ans:B
3) The phenomenon that when an electric current passes through an anisotropic crystal, there is an absorption or liberation of heat due to the non-uniformity in current distribution.
A) Bridgman effect
B) Corona effect
C) Dember effect
D) Destriau effect
Ans:A
4) The B-H curve of is not a straight line.
A) air
B) wood
C) silicon steel
D) soft iron
Ans:D
5) If a magnetic flux cuts across 200 turns at a rate of 2Wb/s, the induced voltage according to Faraday’s law is about
A) 400 V
B) 100 V
C) 200 V
D) 600 V
Ans:A
6) What is the SI unit of reluctance?
A) At
B) At/m
C) N/Wb
D) At/Wb
Ans:D
7) A magnetizing force of 1000 AT/m will produce a flux density of in air.
A) 1.257 mWb/m^2
B) 0.63 Wb/m^2
C) 1.257 Wb/m^2
D) 0.63 mWb/m^2
Ans:A
8) Hysteresis loss can be reduced by one of the following.
A) Increasing mmf of the circuit
B) Using material narrow hysteresis loop
C) Using ferromagnetic core
D) Laminating the magnetic circuit
Ans:B
9) The core of a transformer heats up when its primary is fed from an ac source because of
A) permeability
B) ferromagnetism
C) reluctance of core
D) hysteresis loss
Ans:D
10) Which of the following materials has the least hysteresis loop area?
A) soft iron
B) silicon steel
C) hard steel
D) wrought iron
Ans:B
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1) Another term for corona discharge.
A) Lightning
B) Sparking
C) Aurora
D) Corona Effect
Ans:C
2) The B-H curve for is a straight line passing through the origin.
A) cobalt
B) air
C) hardened steel
D) soft iron
Ans:B
3) The phenomenon that when an electric current passes through an anisotropic crystal, there is an absorption or liberation of heat due to the non-uniformity in current distribution.
A) Bridgman effect
B) Corona effect
C) Dember effect
D) Destriau effect
Ans:A
4) The B-H curve of is not a straight line.
A) air
B) wood
C) silicon steel
D) soft iron
Ans:D
5) If a magnetic flux cuts across 200 turns at a rate of 2Wb/s, the induced voltage according to Faraday’s law is about
A) 400 V
B) 100 V
C) 200 V
D) 600 V
Ans:A
6) What is the SI unit of reluctance?
A) At
B) At/m
C) N/Wb
D) At/Wb
Ans:D
7) A magnetizing force of 1000 AT/m will produce a flux density of in air.
A) 1.257 mWb/m^2
B) 0.63 Wb/m^2
C) 1.257 Wb/m^2
D) 0.63 mWb/m^2
Ans:A
8) Hysteresis loss can be reduced by one of the following.
A) Increasing mmf of the circuit
B) Using material narrow hysteresis loop
C) Using ferromagnetic core
D) Laminating the magnetic circuit
Ans:B
9) The core of a transformer heats up when its primary is fed from an ac source because of
A) permeability
B) ferromagnetism
C) reluctance of core
D) hysteresis loss
Ans:D
10) Which of the following materials has the least hysteresis loop area?
A) soft iron
B) silicon steel
C) hard steel
D) wrought iron
Ans:B
If you like my post please share it with your friends and subscribe to latest updates.. If you have doubts you can start new topic on forum and start discussion with our readers..
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