Online Electronic Devices Test - Electronic Devices Test - Random

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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 state of an ideal diode in the region of nonconduction?

An open circuit

A short circuit

Unpredictable

Undefined

[#]

Determine the value of

when

= 100.

1.01

101

0.99

Cannot be solved with the information provided

[#]

Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?

Small-signal

Large-signal

Small- or large-signal

None of the above

[#]

What is the range of an FET's input impedance?

to 1 k

1 k

to 10 k

50 k

to 100 k

1 M

to several hundred M

[#]

In an enhancement-type MOSFET, the drain current is zero for levels of V_GS less than the ________ level.

V_GS(Th)

V_GS(off)

V_P

V_DD

[#]

Which of the following elements is (are) important in determining the gain of the system in the high-frequency region?

Interelectrode capacitances

Wiring capacitances

Miller effect capacitance

All of the above

[#]

In the differential amplifier circuit, which of the following terminals are connected together?

Bases

Collectors

One base to another collector

Emitters

[#]

A class A amplifier with R_C = 3.3 k

and R_E = 1.2 k

has a V_CC = 20 V. Find I_C(sat).

4.4 mA

6.1 mA

16.7 mA

20 mA

[#]

Which of the power amplifiers is not intended primarily for large-signal or power amplification?

Class A

Class B or AB

Class C

Class D

[#]

10.

At which of the following period(s) is the counter advanced (incremented) in dual-slope conversion?

During the charging of the capacitor of the integrator

During the discharging of the capacitor of the integrator

During both the charging and discharging of the capacitor of the integrator

None of the above

[#]

11.

With feedback,

, the overall gain of the circuit is reduced by a factor ________ where A is the gain without the feedback.

1 +

[#]

12.

What is the typical dropout voltage for the 7812 fixed positive voltage regulator?

4 mV

100 mV

1.5 V

2 V

[#]

13.

Refer to the given figure. If the output of the circuit were to be a short circuit, what power rating would R₁ need to have?

2.25 W

5 W

10 W

22.5 W

[#]

14.

How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?

[#]

15.

In the negative-resistance region of tunnel diodes, as the terminal voltage increases, the diode current ________.

remains the same

decreases

increases

is undefined

[#]

16.

How many terminals does a Shockley diode have?

[#]

17.

The output voltage of a center-tapped full-wave rectifier equals the secondary output voltage.

True

False

[#]

18.

Each RC circuit causes the gain to drop at a rate of ________ dB/decade.

none of the above

[#]

19.

The main difference between the isolation amplifier and an instrumentation amplifier is

an instrumentation amplifier has an input stage.

an instrumentation amplifier has an output stage.

an instrumentation amplifier has a differential stage.

the input, output, and power supply stages of an isolation amplifier are all electrically isolated from each other.

[#]

20.

The mixer takes the RF signal along with the audio signal to produce the IF signal.

True

False

[#]

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