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.

In the given circuit, the voltage dropped across R3 equals ___.

A.
1.5 V
B.
3 V
C.
6 V
D.
More information is needed to find the voltage dropped across R3.

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Series Circuits

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2.

If the voltmeter indicates 12 V in the given circuit, the voltage across R2 equals ___.

A.
12 V
B.
VS minus 12 V
C.
0 V
D.
More information is needed to find the voltage across R2.

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Parallel Circuits

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3.

A transformer turns ratio of ________ will be needed to match an output impedance of 5 komega.gif to an 8 omega.gif speaker.

A.
5:1
B.
8:1
C.
25:1
D.
625:1

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Transformers

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4.

Boolean multiplication is symbolized by A + B.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Logic Circuit Simplification

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5.

What is the voltage across R1 if the P-N junction is made of silicon?

A.
12 V
B.
11.7 V
C.
11.3 V
D.
0 V

Your Answer: Option (Not Answered)

Correct Answer: Option C

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6.

What is the power dissipated by R1, R2, and R3?

A.
P1 = 0.13 W, P2 = 0.26 W, P3 = 0.12 W
B.
P1 = 0.26 W, P2 = 0.52 W, P3 = 0.23 W
C.
P1 = 0.52 W, P2 = 0.92 W, P3 = 0.46 W
D.
P1 = 1.04 W, P2 = 1.84 W, P3 = 0.92 W

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Series-Parallel Circuits

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7.

When the output of a standard TTL gate is HIGH, it can ___________________.

A.
sink 16 mA of current from the attached input gates
B.
source 400 mu.gifA of current to no more than 10 attached gates
C.
source 16 mA of current to no more than 10 attached gates
D.
sink a maximum of 400 mu.gifA from no more than 10 load gates

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Standard Logic Devices (SLD)

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8.

In both induction and synchronous ac motors

A.
the operating speed is very steady
B.
the stator magnetic field is stationary
C.
the stator magnetic field rotates
D.
the "squirrel cage" forms the rotor

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Alternating Current and Voltage

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9.

If we double the number of bits in our digital representation of a number from 4 to 8 bits, we double the relative accuracy of the conversion from digital to analog.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Analog and Digital Converters

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10.

The true power in an RC series circuit is PR = I2 x R.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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11.

If two resistors have the same voltage drop in a series circuit, it means:

A.
they are connected in parallel
B.
they are of unequal value
C.
the voltage has doubled
D.
they are of equal value

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Series Circuits

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12.

A PLL can be used as a(n) ___________.

A.
series voltage regulator
B.
frequency multiplier
C.
relaxation oscillator
D.
Schmitt trigger

Your Answer: Option (Not Answered)

Correct Answer: Option B

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13.

The current through a resistor can be found by dividing the resistor's voltage by its ohmic value.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Ohm's Law

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14.

CAD software can be used to create a detailed logic circuit that will perform like an actual PLD.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Programmable Logic Devices (PLD)

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15.

A device that uses a binary decoder to direct a digital signal from a single source to one of several destinations is a ________.

A.
multiplexer
B.
demultiplexer
C.
encoder
D.
comparator

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Combinational Logic Circuits

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16.

When a parallel circuit resonates it is said to:

A.
flywheel
B.
oscillate
C.
both of the above
D.
none of the above

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : RLC Circuits and Resonance

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17.

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

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18.

Electrons in the conduction band are the only ones that are included in the electron current flow.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Diodes and Applications

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19.

What is electromagnetism?

A.
the magnetic field generated around a conductor when a current passes through it
B.
the magnetic field generated in a conductor by an external voltage
C.
the voltage caused by a magnetic field in a conductor
D.
the current generated by an external magnetic field

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Inductors

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20.

When current flow tries to decrease in an inductor, the magnetic field _______________ and the voltage polarity across the inductor _______________.

A.
collapses, remains the same
B.
expands, reverses
C.
collapses, reverses
D.
expands, remains the same

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Inductors

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