Electronic Devices Test - Random - Online Electronic Devices Test

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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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Marks : 2/20

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How many orbiting electrons does the germanium atom have?

[#]

A silicon diode has a voltage to ground of –117 V from the anode. The voltage to ground from the cathode is –117.7 V. The diode is

open.

shorted.

forward-biased.

reverse-biased.

[#]

The dc voltage level of a silicon diode is ________ its ideal model.

smaller than

larger than

the same as

None of the above

[#]

The region to the left of the pinch-off locus is referred to as the ________ region.

saturation

cutoff

ohmic

All of the above

[#]

The transfer curve is not defined by Shockley's equation for the ________.

JFET

depletion-type MOSFET

enhancement-type MOSFET

BJT

[#]

The specification sheet provides ________ to calculate the value of k for enhancement-type MOSFETs.

V_GS(on)

I_D(on)

V_GS(Th)

All of the above

[#]

The decibel (dB) is defined such that ________ decibel(s) = ________ bel(s).

1, 10

10, 1

1, 1

10, 10

[#]

Which amplifier is commonly used as a frequency multiplier?

class A

class B

class C

all of the above

[#]

The least efficient amplifier among all classes is

class B.

class A.

class AB.

class C.

[#]

10.

When the loop is in lock in a PLL, the input frequency is ________ the output frequency from the VCO.

the same as

greater than

smaller than

None of the above

[#]

11.

What is the ratio of the peak ripple voltage level to its rms voltage level?

[#]

12.

________ regulation can be defined as the percentage change in the output voltage for a given change in the input voltage.

Line

Load

[#]

13.

Which of the following devices has the smallest turn-off time?

SCR

GTO

SCS

LASCR

[#]

14.

A thyristor is a ________-layer semiconductor material device.

[#]

15.

A reverse-biased diode has the ________ connected to the positive side of the source, and the ________ connected to the negative side of the source.

cathode, anode

cathode, base

base, anode

anode, cathode

[#]

16.

The common-base amplifier has a good voltage gain, low input impedance, and high current gain.

True

False

[#]

17.

Refer to this figure. You are attempting to determine the lower cutoff frequency of this amplifier in the lab. As you change the input frequency and measure the output signal, you must remember to

set the oscilloscope to DC.

maintain the input voltage constant.

keep a constant temperature.

watch for a change of

[#]

18.

UJTs can only be used to trigger triacs, not SCRs.

True

False

[#]

19.

Filters with the ________ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole.

Butterworth

Chebyshev

Bessel

[#]

20.

A VCO is a variable capacitance oscillator.

True

False

[#]

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Online Electronic Devices Test - Electronic Devices Test - Random

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