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 unit is used to represent the level of a diode forward current I_F?

[#]

An open circuit can have any voltage across its terminals, but the current is always ________.

5 A

0 A

1 A

[#]

Each diode in a center-tapped full-wave rectifier is ________ -biased and conducts for ________ of the input cycle.

forward, 90º

reverse, 180º

forward, 180º

reverse, 90º

[#]

In what decade was the first transistor created?

1930s

1940s

1950s

1960s

[#]

________ has high input impedance, fast switching speeds, and lower operating power levels.

CMOS

FET

BJT

None of the above

[#]

For R₂ smaller than ________ k

the voltage V_D is equal to V_DD = 16 V.

3.75

12.0

[#]

Refer to the given figure. This amplifier is known as

an inverting amplifier.

a non-inverting amplifier.

a voltage-follower.

a common-source amplifier.

[#]

The main feature of the differential amplifier is the ________ gain when opposite signals are applied to the inputs as compared to the ________ gain resulting from common inputs.

very large, large

very small, large

very small, very large

very large, very small

[#]

The principal advantage(s) of MOSFETs over BJTs is (are)

their biasing networks are simpler.

their drive requirements are simpler.

they can be connected in parallel for added drive capability.

all of the above

[#]

10.

Calculate the frequency of this circuit.

635 Hz

450 Hz

228 Hz

128 Hz

[#]

11.

For the RS-232C circuit, ________ is a mark and ________ is a space.

12 V, –12 V

–12 V, 12 V

5 V, 0 V

–5 V, 0 V

[#]

12.

In the Wien bridge oscillator with R₁ = R₂ = R and C₁ = C₂ = C, a ratio of R₃ to R₄ will provide sufficient loop gain for the circuit to oscillate.

0.5

[#]

13.

What type of regulator offers inherent short-circuit protection?

shunt regulators

series regulators

three-terminal regulators

switching regulators

[#]

14.

The series 7900 ICs are ________.

positive voltage regulators

negative voltage regulators

both positive and negative voltage regulators

adjustable-set voltage regulators

[#]

15.

What is the typical range of turn-off times for SCRs?

s to 30

s to 5

0.1

s to 1

0.01

s to 0.1

[#]

16.

One characteristic of amplifiers is that the sum of the voltage gain and the bandwidth is always constant when the roll-off is –20 dB/decade.

True

False

[#]

17.

A decade of frequency change is a change by a factor of 10.

True

False

[#]

18.

Identify the symbol for an SCS.

[#]

19.

A basic ________ amplifier is formed by three op-amps and seven resistors.

instrumentation

isolation

log

antilog

[#]

20.

Which filter exhibits a linear phase characteristic?

Bessel

Butterworth

Chebyshev

all of the above

[#]

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