Exercise: Electronic Principles

Questions for: Electronic Principles

The rms value of a sine waveform is:
A:
the number of cycles completed in one second
B:
the time required to complete one full cycle
C:
equal to 0.707 times the peak amplitude
D:
equal to 1.41 times the peak amplitude
Answer: C
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A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
A:
310 Ohm
B:
400 Ohm
C:
410 Ohm
D:
550 Ohm
Answer: C
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The knee voltage of a diode is approximately equal to the
A:
Applied voltage
B:
Barrier potential
C:
Breakdown voltage
D:
Forward voltage
Answer: B
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Which one of the following phrases most accurately describes a purely inductive circuit?
A:
Resistances provide the only opposition to current flow
B:
Inductive reactance provides the only opposition to current flow
C:
Combinations of resistance and inductive reactance provide any opposition to current flow
D:
The ac voltage lags the current by 90 degree
Answer: B
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Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
A:
P = I2R
B:
P = IE
C:
P = E2/R
D:
I = P/E
Answer: D
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