Online Electronic Devices Test - Electronic Devices Test 6

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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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A silicon diode in a half-wave rectifier has a barrier potential of 0.7 V. This has the effect of

reducing the peak output voltage by 0.7 V.

increasing the peak output voltage by 0.7 V.

reducing the peak input voltage by 0.7 V.

no effect.

[#]

Which diode arrangement will supply a positive output voltage?

[#]

How many layers of material does a transistor have?

[#]

You can select the values for the emitter and collector resistors from the information that is provided for this circuit.

True

False

[#]

For an "on" transistor, the voltage V_BE should be in the neighborhood of 0.7 V.

True

False

[#]

The slope of the dc load line in a self-bias configuration is controlled by ________.

V_DD

R_D

R_G

R_S

[#]

Referring to this figure, find Z_o if y_os = 20

1.85 k

1.92 k

2.05 k

2.15 k

[#]

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

[#]

Calculate the output voltage if V₁ = V₂ = 700 mV.

0 V

–12 V

12 V

–8 V

[#]

10.

The input impedance of a voltage buffer is ________.

very low

low

high

very high

[#]

11.

What is the function of a ladder network?

Changing an analog signal to a digital signal

Changing a linear signal to a digital signal

Changing a digital signal to an analog signal

None of the above

[#]

12.

For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.

Wien-bridge

phase-shift

twin-T

[#]

13.

The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.

Hartley

Armstrong

Colpitts

[#]

14.

In a full-wave rectifier, the dc voltage level is ________ the ripple voltage level.

smaller than

the same as

larger than

None of the above

[#]

15.

Which of the following semiconductor materials is (are) used for manufacturing solar cells?

Gallium arsenide

Indium arsenide

Cadmium sulfide

All of the above

[#]

16.

A Schottky diode has ________ level of current at the same applied bias compared to that of the p-n junction at both the forward- and reverse-bias regions.

a lower

a higher

the same

None of the above

[#]

17.

For a forward-biased diode, as temperature is ________, the forward current ________ for a given value of forward voltage.

decreased, increases

increased, increases

increased, decreases

decreased, decreases

[#]

18.

Refer to this figure. The value of

_DC is

5.3.

53.

94.

100.

[#]

19.

The voltage gain of a common-source amplifier is found by the product of g_m and R_d.

True

False

[#]

20.

Class D amplifier efficiencies can reach practical levels of more than 90%.

True

False

[#]

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Online Electronic Devices Test - Electronic Devices Test 6

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