Electronic Principles - Section 1 (4)

25.

Which one of the following statements is true for the voltages in a series RC circuit?

A.	The total voltage is equal to the sum of the voltages across the resistance and capacitance
B.	The voltage always has the same amplitude and phase for every part of the circuit
C.	The total voltage is less than the sum of the voltages across the resistance and capacitance
D.	The total voltage is greater than the sum of the voltages across the resistance and capacitance
E.	None of the above

Answer: Option C

Explanation:

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26.

A high-pass filter:

A.	passes lower-frequency signals and reduces higher-frequency signals
B.	passes higher-frequency signals and reduces lower-frequency signals
C.	has no effect on ac signals
D.	increases the level of all frequencies by a significant amount
E.	None of the above

Answer: Option B

Explanation:

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27.

Which one of the following is a direct statement of Ohm's law?

A.	The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
B.	The total resistance of a parallel circuit is less than the value of the smallest resistance
C.	The algebraic sum of voltages in a loop is equal to zero
D.	The algebraic sum of currents entering and leaving a point is equal to zero
E.	None of the above

Answer: Option A

Explanation:

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28.

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
E.	None of the above

Answer: Option C

Explanation:

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29.

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
E.	None of the above

Answer: Option C

Explanation:

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30.

The knee voltage of a diode is approximately equal to the

A.	Applied voltage
B.	Barrier potential
C.	Breakdown voltage
D.	Forward voltage
E.	None of the above

Answer: Option B

Explanation:

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31.

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
E.	None of the above

Answer: Option B

Explanation:

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32.

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
E.	None of the above

Answer: Option D

Explanation:

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