Online Electronic Devices Test - Electronic Devices Test 9

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The reverse saturation current I_s will just ________ in magnitude for every 10° C increase in temperature.

double

remain the same

halve

triple

[#]

In a particular problem, which mode has the highest level of I_DQ?

Ideal

Approximate equivalent

Exact mode using characteristic curve

None of the above

[#]

An example of a pnp silicon transistor is a 2N4123.

True

False

[#]

Under which of the following conditions is the output impedance of the network approximately equal to R_C for a common-emitter fixed-bias configuration?

r_o

10R_C

r_o < 10R_C

r_o < r_o

r_o > r_o

[#]

Which one of the following configurations has the lowest input impedance?

Fixed-bias

Common-base

Emitter-follower

Voltage-divider?

[#]

What is the most important r parameter for amplifier analysis?

r_b′

r_c′

r_e′

[#]

The peak value of the ac input signal is controlled by the ________ in a transistor network for the frequencies in the low to midrange.

resistors

applied dc voltage

capacitors

None of the above

[#]

Which of the following instruments displays the harmonics of a distorted signal?

Digital multimeter

Spectrum analyzer

Oscilloscope

Wave analyzer

[#]

A comparator circuit accepts input of ________ voltages and provides a ________ output that indicates when one input is less than or greater than the second.

linear, digital

linear, linear

digital, linear

None of the above

[#]

10.

In a 555 timer, a series connection of three resistors sets the reference voltage levels to the two comparators at ________ and ________.

2V_CC / 3, V_CC / 3

V_CC / 2, V_CC / 4

V_CC, V_CC / 2

V_CC, V_CC

[#]

11.

Which of the following is (are) the determining factor(s) of the stability of a feedback amplifier?

Phase shift between input and output signals

Both A and the phase shift between input and output signals

None of the above

[#]

12.

This circuit is a ________ oscillator.

phase-shift

Wien bridge

Colpitts

Hartley

[#]

13.

The 7912 regulator IC provides ________ .

5 V

–5 V

12 V

–12 V

[#]

14.

Refer to this figure. Which symbol is correct for an LED?

[#]

15.

The regulating ability of zener diodes depends on their ability to operate in a forward-bias condition.

True

False

[#]

16.

For normal operation of a pnp BJT, the base must be ________ with respect to the emitter and ________ with respect to the collector.

positive, negative

positive, positive

negative, positive

negative, negative

[#]

17.

A common-emitter amplifier has the advantages of good voltage, current, and power gain, but the disadvantage of a relatively low input impedance.

True

False

[#]

18.

At the cutoff frequency the output is down 20 dB.

True

False

[#]

19.

The feedback signal in a Hartley oscillator is derived from an inductive voltage in the tank circuit.

True

False

[#]

20.

A phase-locked loop (PLL) is a feedback circuit consisting of a

phase detector.

low-pass filter.

VCO.

all of the above

[#]

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Online Electronic Devices Test - Electronic Devices Test 9

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