22.
What is the inductive reactance if the Q of a coil is 60, and the winding resistance is 5 omega.gif?
A. 0.083 omega.gif
B. 12 omega.gif
C. 30 omega.gif
D. 300 omega.gif
Answer & Explanation
Answer: Option D
Explanation:
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23.
The time difference, or lag, between flux density and magnetizing force is known as:
A. eddy current
B. magnetic saturation
C. hysteresis
D. coercivity
Answer & Explanation
Answer: Option C
Explanation:
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24.
A magnetic circuit breaker will open to protect equipment only when:
A. voltage is exceeded
B. an open is in the equipment
C. the equipment is operating properly
D. current is exceeded
Answer & Explanation
Answer: Option D
Explanation:
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25.
Electromagnetic induction is the generation of:
A. electricity from magnetism
B. electricity from electricity
C. magnetism from electricity
D. magnetism from magnetism
Answer & Explanation
Answer: Option A
Explanation:
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26.
Inductance is:
A. directly proportional to the length of the coil
B. directly proportional to the number of turns on the coil
C. inversely proportional to the cross-sectional area of the coil
D. inversely proportional to the permeability
Answer & Explanation
Answer: Option B
Explanation:
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27.
Current will cause a magnetic field in a conductor as follows:
A. An ac current causes a fixed polarity magnetic field.
B. A dc current causes a fixed polarity magnetic field.
C. A dc current causes an alternating magnetic field.
D. An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
Answer & Explanation
Answer: Option B
Explanation:
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28.
What is the total inductance, assuming no mutual inductance?
mcq8_1030_1.gif
A. 12 mH
B. 6 mH
C. 0.73 mH
D. 0 mH
Answer & Explanation
Answer: Option A
Explanation:
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