Exercise: Electronic Principles

Questions for: Electronic Principles

Which one of the following statements is true for the impedance of a series RC circuit?
A:
The impedance is greater than the sum of the resistance and capacitive reactance
B:
The impedance is equal to the sum of the resistance and capacitive reactance
C:
The impedance is greater than either the resistance or capacitive reactance but less than their sum
D:
The impedance is less than the sum of the resistance and capacitive reactance
Answer: C
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Doubling the diameter of the coil in an inductor:
A:
multiplies the value of inductance by two
B:
reduces the value of inductance by one-half
C:
reduces the value of inductance by one-fourth
D:
multiplies the value of inductance by four
Answer: A
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Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?
A:
200 W
B:
1000 W
C:
20 W
D:
100 W
Answer: A
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As the temperature increases, the current gain
A:
increases
B:
decreases
C:
contant
D:
can be any of the above
Answer: A
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The core of an electromagnet is said to be in saturation when:
A:
the core is permitted to move freely within the coil
B:
an increase in current through the coil causes no further increase in the mmf
C:
frequent changes in the direction of current through the coil causes heating effects in the core material
D:
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
Answer: B
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