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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The combination of a short circuit in series with an open circuit always results in a(n) ________ circuit.

open

short

neither short nor open

unknown

[#]

Refer to this figure. If an emitter bypass capacitor was installed, what would the new A_v be?

4.96

125

398

600

[#]

The pinch-off voltage continues to drop in a ________ manner as V_GS becomes more and more negative.

linear

parabolic

cubic

None of the above

[#]

Determine the quiescent values of I_D and V_GS.

1.2 mA, –1.8 V

1.5 mA, –1.5 V

2.0 mA, –1.2 V

3.0 mA, –0.8 V

[#]

The range of input impedance Z_i for MOSFETs is ________.

1 k

–10 k

100 k

–1 M

10 M

–100 M

10₁₂

to 10₁₅

[#]

What is the cutoff frequency of an op-amp if the unity-gain frequency is 1.5 MHz and the open-loop gain is 100,000?

5 Hz

10 Hz

15 Hz

20 Hz

[#]

Calculate the output voltage.

–6.00 mV

6.0 mV

6.12 mV

–6.12 mV

[#]

How many op-amps are required to implement this equation?

V_o = V₁

[#]

Which of the following is (are) power amplifiers?

Class A

Class B or AB

Class C or D

All of the above

[#]

10.

Which type of amplifier uses pulse (digital) signals in its operation?

Class A

Class B or AB

Class C

Class D

[#]

11.

Which of the following is (are) the results of improvements built into a comparator IC?

Faster switching between the two output levels

Noise immunity

Outputs capable of directly driving a variety of loads

All of the above

[#]

12.

In a full-wave rectifier, if no load were connected across the capacitor, the output voltage would ideally be a(n) ________.

ac voltage

constant dc voltage

pulsating dc voltage

ramp voltage

[#]

13.

What is the voltage drop across Schottky diodes?

0 V to 0.2 V

0.7 V to 0.8 V

0.8 V to 1.0 V

1.0 V to 1.5 V

[#]

14.

What is the power density received from the sun at sea level?

10 mW/cm²

100 mW/cm²

500 mW/cm²

1 W/cm²

[#]

15.

How many terminals does a silicon-controlled switch (SCS) device have?

[#]

16.

Refer to the given figure. The most probable cause of trouble, if any, from these voltage measurements is

the base-emitter junction is open.

R_E is open.

a short from collector to emitter.

no problems.

[#]

17.

Refer to this figure. The value of I_C is

10 mA.

5 mA.

50 mA.

[#]

18.

For a JFET, the value of V_DS at which I_D becomes essentially constant is the

pinch-off voltage.

cutoff voltage.

breakdown voltage.

ohmic voltage.

[#]

19.

Refer to figure given below. Determine the value of V_GS.

–20 V

–8 V

–6 V

–2 V

[#]

20.

The output of a Schmitt trigger is a

pulse waveform.

sawtooth waveform.

sinusoidal waveform.

triangle waveform.

[#]

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