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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At what kind of operating frequency diffusion or transition is a capacitor represented in parallel with the ideal diode?

Low frequency

Moderate frequency

Mid frequency

Very high frequency

[#]

The condition of a semiconductor diode can be determined quickly using a ________.

DDM

VOM

curve tracer

Any of the above

[#]

What is the voltage measured from the negative terminal of C₄ to the negative terminal of the transformer?

–10 V

–20 V

10 V

20 V

[#]

In a voltage-multiplier circuit, the number of diodes is directly proportional to the multiplicative voltage factor.

True

False

[#]

Rectifiers are commonly used in battery chargers.

True

False

[#]

What is the limit of the efficiency defined by = P_o / P_i?

Greater than 1

Less than 1

Always 1

None of the above

[#]

The bypass capacitor in a common-emitter configuration ________ the voltage gain.

significantly decreases

significantly increases

slightly increases

slightly decreases

[#]

In a JFET, the level of ________ is limited to values between 0 V and –V_P.

[#]

The ________ configuration has an input impedance, which is other than R_G.

common-source

common-gate

common-drain

None of the above

[#]

10.

At what input voltage level does the output voltage level become numerically equal to the value of the common-mode gain of the amplifier?

V_i1 = –V_i2 = 0.25 V

V_i1 = –V_i2 = 0.50 V

V_i1 = –V_i2 = 0.75 V

V_i1 = –V_i2 = 1.00 V

[#]

11.

In a current-controlled voltage source using the inverting op-amp circuit, the controlled output current is ________ with the input voltage source.

in phase

45º out of phase

90º out of phase

180º out of phase

[#]

12.

Refer to this figure. What is the duty cycle, if any?

16.3%

54.5%

86.9%

none

[#]

13.

Referring to this figure, calculate the amplification gain with feedback for the following circuit values: R₁ = 80 k

, R₂= 20 k

, R_o = 10 k

, R_D = 61 k

, and g_m = 4000 μS.

–4.36

–4.25

–6.35

–20.85

[#]

14.

A dc voltmeter reads the ________ while measuring a pulsating dc voltage.

ac component of the signal

average of the signal

peak of the pulsating signal

None of the above

[#]

15.

An intrinsic crystal is one that contains a small amount of impurities.

True

False

[#]

16.

If maximum I_C and maximum V_CE are applied to a BJT, maximum power dissipation will not be exceeded.

True

False

[#]

17.

The formula

_DC = I_B/I_C is correct.

True

False

[#]

18.

At the cutoff frequency the output is down 20 dB.

True

False

[#]

19.

A pass transistor may be used in a series regulator, as the current-carrying device.

True

False

[#]

20.

The IF of an FM receiver operates at a center frequency of 455 kHz.

True

False

[#]

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