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Electronic Devices Test 9

Electronic Devices Result & Statistics

1. The reverse saturation current Is will just ________ in magnitude for every 10° C increase in

temperature.

A. double

B. remain the same

C. halve

D. triple

Answer: Option A

Learn more problems on : Semiconductor Diodes

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2. In a particular problem, which mode has the highest level of IDQ?

A. Ideal

B. Approximate equivalent

C. Exact mode using characteristic curve

D. None of the above

Answer: Option A

Learn more problems on : Diode Applications


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

A. True B. False

Answer: Option B

Learn more problems on : BJT Devices


4. What is the most important r parameter for amplifier analysis?

A. rb′ B. rc′

C. re′ D. [NIL]

Answer: Option C

Learn more problems on : BJT Amplifiers


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

Marks : 0/20

Total number of questions : 20

Number of answered questions : 0

Number of unanswered questions : 20

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A. Fixed-bias B. Common-base

C. Emitter-follower D. Voltage-divider?

Answer: Option B



6. Under which of the following conditions is the output impedance of the network approximately

equal to RC for a common-emitter fixed-bias configuration?

A. ro 10RC

B. ro < 10RC

C. ro < ro

D. ro > ro

Answer: Option A



7. The peak value of the ac input signal is controlled by the ________ in a transistor network for

the frequencies in the low to midrange.

A. resistors

B. applied dc voltage

C. capacitors


Answer: Option B



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

A. Digital multimeter

B. Spectrum analyzer

C. Oscilloscope

D. Wave analyzer

Answer: Option B

Learn more problems on : Power Amplifiers


9. In a 555 timer, a series connection of three resistors sets the reference voltage levels to the

two comparators at ________ and ________.

A. 2VCC / 3, VCC / 3

B. VCC / 2, VCC / 4

C. VCC, VCC / 2

D. VCC, VCC

Answer: Option A

Learn more problems on : Linear-Digital ICs


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10. A comparator circuit accepts input of ________ voltages and provides a ________ output that

indicates when one input is less than or greater than the second.

A. linear, digital

B. linear, linear

C. digital, linear


Answer: Option A

Learn more problems on : Linear-Digital ICs


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

A. A

B. Phase shift between input and output signals

C. Both A and the phase shift between input and output signals


Answer: Option C

Learn more problems on : Oscillator Circuits


12. This circuit is a ________ oscillator.

A. phase-shift

B. Wien bridge

C. Colpitts

D. Hartley

Answer: Option C



13. The 7912 regulator IC provides ________ .

A. 5 V

B. –5 V

C. 12 V


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D. –12 V

Answer: Option D

Learn more problems on : Voltage Regulators


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

A. a B. b

C. c D. d

E. e

Answer: Option A

Learn more problems on : Special-Purpose Diodes


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

condition.

A. True B. False

Answer: Option B

Learn more problems on : Special-Purpose Diodes


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

________ with respect to the collector.

A. positive, negative

B. positive, positive

C. negative, positive

D. negative, negative

Answer: Option C

Learn more problems on : Bipolar Junction Transistors


17. A common-emitter amplifier has the advantages of good voltage, current, and power gain, but

the disadvantage of a relatively low input impedance.

A. True B. False

Answer: Option A



18. At the cutoff frequency the output is down 20 dB.


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A. True B. False

Answer: Option B

Learn more problems on : Amplifier Frequency Response


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

circuit.

A. True B. False

Answer: Option A



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

A. phase detector.

B. low-pass filter.

C. VCO.

D. all of the above

Answer: Option D

Learn more problems on : Communications


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