Q.1 The portion of power lost corresponds the difference between the energy stored and the energy returned back by the magnetic core. This is called as___.
A. hysteresis loss
B. eddy current loss
C. power loss
D. energy loss
Ans.: A
Q.2 which of the following factored affects the hysteresis loss?
A. volume of the material
B. Area enclosed by the hysteresis
C. Frequency of magnetization
D. All of the above
Ans.: D
Q.3 How to minimize the hysteresis loss?
A. by reducing operating frequency
B. by reducing volume of the materials
C. by selecting a material which has narrow hysteresis loop
D. All of the above
Ans.: D
Q.4 Hysteresis loss is proportional to___
A. f
B. f2
C. f.5
D. f1.5
Ans.: A
Q. 5 On which of the following the hysteresis loss not depend?
A. temperature
B. frequency
C. volume of the material
D. magnetic field intensity
Ans.: A
Q. 6 Material with a large hysteresis loop are used for producing the____.
A. Transformer core
B. Electromagnet
C. Permanent magnet
D. Generator stater
Ans.: C
Q.7 A material which have a very small Area under the hysteresis loop. This type of materials is used for the___.
A. ac machines
B. transformers
C. Both A and B
D. None of the above
Ans.: C
Q. 8 Which of the following is/are ways of generating emf?
A. by chemical reaction
B. by using active transducers
C. electromagnetic induction
D. All of the above
Ans.: D
Q. 9 The generation of emf due to electromagnetic induction was first obtained by___.
A. Hopkin’s son
B. Fleming’s
C. Rutherford
D. Michael Faraday
Ans.: D
Q. 10 ____ is the phenomenon in which an emf gets induced in a conductor placed in the magnetic field.
A. electromagnetic field
B. Electromagnetic induction
C. Electrochemical reaction
D. none of the above
Ans.: B
Q.11 Whenever the magnetic lines of force linking with a coil or conductor changes, an emf gets induced in the coil or conductor. This is the ____.
A. Faraday’s first law
B. Faraday’s second law
C. Fleming’s right hand rule
D. All of the above
Ans.: A
Q.12 Faraday’s second law state that the magnitude of the induced emf is _____ to the rate of change of flux linkage.
A. inversely proportional
B. directly proportional
C. square proportional
D. None of the above
Ans.: B
Q.13 The direction of induced emf can be found out by ___.
A. by using the Fleming’s right hand rule
B. by using the Lenz’s law
C. Fleming’s left hand rule
D. Both A and B
Ans.: D
Q. 14 According to Fleming’s right hand rule, second finger indicates____.
A. direction of line of force
B. direction of conductor motion
C. direction of the induced emf
D. any of the above
Ans.: C
Q.15 According to Fleming’s right hand rule, outstretched thumb point the ____.
A. direction of emf induced
B. direction of conductor motion
C. direction of line of force
D. none of the above
Ans.: B
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