Online Electronic Devices Test - Electronic Devices Test 7

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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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What is the logic function of this circuit?

Positive logic AND gate

Positive logic OR gate

Negative logic AND gate

Negative logic OR gate

[#]

What is the most frequently encountered transistor configuration?

Common-base

Common-collector

Common-emitter

Emitter-collector

[#]

For practical transistors the level of alpha typically extends from ________ to ________ with most approaching the higher end of the range.

0.0, 1

0.90, 0.998

50, 400

None of the above

[#]

Calculate V_CE.

4.52 V

–4.52 V

4.48 V

–4.48 V

[#]

In an FET transistor, the depletion region is ________ near the top of both p-type materials.

wider

narrower

the same as the rest of the depletion region

None of the above

[#]

The enhancement-type MOSFET is in the cutoff region if ________.

applied V_GS is larger than V_GS(Th)

applied V_GS is less than or equal to V_GS(Th)

V_GS has a positive level

None of the above

[#]

In the hybrid

or Giacoletto model, which one of the following does r_b include?

Base spreading resistance

Base contact

Base bulk

All of the above

[#]

For any inverting amplifier, the impedance capacitance will be ________ by a Miller effect capacitance sensitive to the gain of the amplifier and the interelectrode capacitance.

unaffected

increased

decreased

None of the above

[#]

If the parasitic capacitors were the only elements to determine the high cutoff frequency, the ________ frequency would be the determining factor.

lowest

highest

lowest or highest

None of the above

[#]

10.

This circuit is an example of a ________.

single-ended input

double-ended (differential) input

double-ended output

common-mode operation

[#]

11.

This is an example of the output swing for a class ________ amplifier.

[#]

12.

Refer to this figure. The dc voltage on the collector, V_C, is

5.4 V.

6.6 V.

12 V.

0 V.

[#]

13.

What is the first phase of the dual-slope method of conversion?

Connecting the analog voltage to the integrator for a fixed time

Setting the counter to zero

Connecting the integrator to a reference voltage

All of the above

[#]

14.

The frequency distortion arising because of varying amplifier gain with frequency is considerably reduced in a negative-voltage feedback amplifier circuit.

True

False

[#]

15.

This is an equivalent circuit for the ________ diode.

Schottky

varicap

tunnel

[#]

16.

Refer to this figure. Which symbol is correct for a zener diode?

[#]

17.

In a class B push-pull amplifier, crossover distortion occurs when both transistors are off and the input signal voltage must exceed V_BE before a transistor conducts.

True

False

[#]

18.

An E-MOSFET can be operated with either positive or negative values of V_GS.

True

False

[#]

19.

The lower critical frequency is also known as the

break frequency.

cutoff frequency.

corner frequency.

all of the above

[#]

20.

Refer to this figure. Increasing the values of the filter section resistors in this circuit will cause the f_c to

increase.

decrease.

remain the same.

increase and then decrease.

[#]

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