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.

If R1 opens in the given circuit, the total current equals ___.

A.
86 mA
B.
170 mA
C.
42 mA
D.
128 mA

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Parallel Circuits

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2.

The frequency of the repetitive pulse waveform in the given circuit equals ___.

A.
500 Hz
B.
50 Hz
C.
100 Hz
D.
125 Hz

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Alternating Current and Voltage

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3.

If a sine wave's period equals 50 ms, its frequency equals _____.

A.
20 Hz
B.
0.02 Hz
C.
50 Hz
D.
50 kHz

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Alternating Current and Voltage

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4.

An instrumentation amplifier has a high

A.
output impedance
B.
power gain
C.
CMRR
D.
supply voltage

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Special-Purpose Op-Amp Circuits

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5.

A strain gauge uses the principle of capacitance for its operation.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Measurement, Conversion and Control

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6.


A magnetic field is produced around a current-carrying conductor.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Magnetism and Electromagnetism

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7.

To keep the number of IC pins to a minimum, the 8085 uses a multiplexed bus.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Computer Hardware and Software

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8.

What is the power in the given circuit?

A.
3.6 W
B.
35 W
C.
175 W
D.
245 W

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Ohm's Law

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9.

4200 W is the same as 4.2 kW.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Quantities and Units

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10.

Calculate the voltage dropped across R1 in the given circuit.

A.
14 V
B.
26.8 V
C.
28 V
D.
0 V

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : RL Circuits

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11.

What is the total current in the given circuit?

A.
0.28 A
B.
0.399 A
C.
909 A
D.
0.2 A

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : RC Circuits

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12.

Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?

A.
OR gates only
B.
AND gates and NOT gates
C.
AND gates, OR gates, and NOT gates
D.
OR gates and NOT gates

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Logic Gates

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13.

If 360 Vac is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?

A.
2.4 Vac
B.
150 Vac
C.
180 Vac
D.
720 Vac

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Inductors

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14.

An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like

A.
a short
B.
an open
C.
a resistor
D.
a voltage source

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Inductors

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15.

The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:

A.
plate separation
B.
negative plate only
C.
field strength
D.
charge difference

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Capacitors

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16.

A Hall effect sensor

A.
exists only in theory
B.
is a noncontacting magnetic sensor
C.
can operate only a few times before failure
D.
produces very large voltages

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Magnetism and Electromagnetism

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17.

The number of joules used in 1 second is always equal to the number of _______.

A.
siemens
B.
coulombs
C.
amperes
D.
watts

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Ohm's Law

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18.

Breakdown voltage and pinch-off voltage of a JFET are different terms for the same voltage level.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Field Effect Transistors (FET)

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19.

The ideal output impedance for an operational amplifier is 0 omega.gif.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Operational Amplifiers

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20.

Which device would best aid in shorted track detection?

A.
multimeter
B.
current tracer
C.
logic pulser
D.
oscilloscope

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Testing and Troubleshooting

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