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.

The power is ___ if 200 J of energy are used in 10 s.

A.
2 W
B.
5 W
C.
20 W
D.
50 W

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Ohm's Law

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2.

What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m?

A.
833.33 µAt/Wb
B.
0.27 At/Wb
C.
1200 At/Wb
D.
More information is needed in order to find the reluctance.

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Magnetism and Electromagnetism

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3.

Power is measured in units of:

A.
joules x charge
B.
joules/work
C.
joules x voltage
D.
joules/time

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Resistance and Power

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4.

In a flash analog-to-digital converter, the output of each comparator is connected to an input of a:

A.
decoder
B.
priority encoder
C.
multiplexer
D.
demultiplexer

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Analog and Digital Converters

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5.

The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Magnetism and Electromagnetism

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6.

The steady-state condition of an integrator is reached after 5 time constants regardless of the number of input pulses that occur in that amount of time.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Time Response of Reactive Circuits

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7.

What are the two types of basic adder circuits?

A.
half adder and full adder
B.
half adder and parallel adder
C.
asynchronous and synchronous
D.
one's complement and two's complement

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Arithmetic Operations and Circuits

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8.

Dark current is a small reverse current that flows in a photodiode that is receiving no light.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Diodes and Applications

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9.

A DIAC is a bidirectional diode that has a symmetrical switching mode.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Thyristors and Tranducers

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10.

Op-amps used as high- and low-pass filter circuits employ which configuration?

A.
noninverting
B.
comparator
C.
open-loop
D.
inverting

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Operational Amplifiers

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11.

Machine language is independent of the type of microprocessor in a computer system.

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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12.

The first goal(s) to accomplish in analyzing a complex series–parallel circuit is to:

A.
equate all parallel components
B.
equate all series components
C.
solve for all the voltage drops
D.
solve for the total current and resistance

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Series-Parallel Circuits

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13.

If the load in the given circuit is 120 komega.gif , what is the loaded output voltage?

A.
4.21 V
B.
15.79 V
C.
16 V
D.
19.67 V

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Series-Parallel Circuits

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14.

What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor, and a 4.7 komega.gif resistor in parallel?

A.
55.3°
B.
–55.3°
C.
34.8°
D.
–34.8°

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : RC Circuits

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15.

The formula used to calculate the approximate ac resistance of the base-emitter diode (re) is

A.
mca17_1005a1.gif
B.
re almostequal.jpg 25 mV × IC
C.
mca17_1005c1.gif
D.
mca17_1005d1.gif

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Transistors and Applications

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16.

The charge of one coulomb is equal to:

A.
6.24 x 10−18 electrons
B.
one ampere
C.
one second
D.
6.24 x 1018 electrons

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Voltage and Current

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17.

Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.

A.
does not change
B.
doubles for every 1 kHz increase in frequency
C.
increases
D.
decreases

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Basic Op-Amp Circuits

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18.

A digital voltmeter can be used to measure resistance.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Resistance and Power

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19.

Series RLC voltage or impedance totals must be calculated by:

A.
subtracting the values
B.
graphing the angles
C.
adding vectors
D.
multiplying the values

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : RLC Circuits and Resonance

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20.

Which of the following cannot actually move?

A.
majority carriers
B.
ions
C.
holes
D.
free electrons

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Semiconductor Principles

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