Online Electronics Test - Electronics Test - Random



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Instruction:

  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best :-).

1.

A potentiometer has how many leads?

A.
1
B.
2
C.
3
D.
4

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Resistance and Power

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2.

How many joules of energy will a 10 W lamp dissipate in one minute?

A.
10 joules
B.
60 joules
C.
600 joules
D.
3600 joules

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Resistance and Power

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3.

With Ohm's law:

A.
current is inversely proportional to resistance
B.
resistance is directly proportional to voltage
C.
voltage is indirectly proportional to power
D.
current is directly proportional to resistance

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Resistance and Power

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4.

How is a 3.9 komega.gif resistor color-coded?

A.
red, white, red, gold
B.
red, green, orange, silver
C.
orange, white, red, gold
D.
orange, green, orange, silver

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Resistance and Power

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5.

If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by two.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Operational Amplifiers

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6.

The purpose of compensation for a thermocouple is

A.
to decrease temperature sensitivity
B.
to increase voltage output
C.
to cancel unwanted voltage output of a thermocouple
D.
used for high-temperature circuits

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Measurement, Conversion and Control

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7.

The control element in a basic shunt voltage regulator is a zener diode.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Basic Op-Amp Circuits

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8.

The ___ is placed in series with the flow of current.

A.
voltmeter
B.
ammeter
C.
ohmmeter
D.
wattmeter


Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Voltage and Current

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9.

A TRIAC will control AC voltage during the positive half cycle only.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Thyristors and Tranducers

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10.

What is the peak voltage across R3 in the given circuit?

A.
1.2 V
B.
5 V
C.
7 V
D.
12 V

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Alternating Current and Voltage

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11.

This is a PNP transistor.

tfq12_1013_1.gif

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Bipolar Junction Transistors (BJT)

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12.

The basic difference between a fuse and a circuit breaker is

A.
a fuse is slower
B.
a fuse is reusable
C.
a circuit breaker is reusable
D.
a circuit breaker is more reliable

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Voltage and Current

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13.

If the output of an RC integrator is zero volts, the capacitor might be open.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Time Response of Reactive Circuits

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14.

The positive lead of a diode is the cathode.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Diodes and Applications

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15.

A reverse biased diode will act as an open switch.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Diodes and Applications

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16.

___ is the concept of one coil inducing a voltage into another coil.

A.
Electrical isolation
B.
Self-inductance
C.
Mutual inductance
D.
Coefficient of coupling

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Transformers

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17.

When 1100010 is divided by 0101, what will be the decimal remainder?

A.
2
B.
3
C.
4
D.
6

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Arithmetic Operations and Circuits

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18.

What is the permeability of transformer iron?

A.
50
B.
450
C.
1,500
D.
5,500

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Inductors

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19.

What is the phase angle?

A.
61.4º
B.
28.5º
C.
-28.5º
D.
-61.4º

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : RLC Circuits and Resonance

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20.

An asynchronous decade counter increases its value by ten for each clock pulse.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Sequential Logic Circuits

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