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.

Power supplies differ from batteries in that

A.
power supply output voltages are ac and not dc
B.
power supply voltages are not stable
C.
power supplies are low-current devices
D.
None of the above

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Ohm's Law

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2.

fbq18_1007.gif

The voltage gain of the amplifier in the given circuit would increase if ______.

A.
the feedback resistor was decreased in value
B.
the input voltage was increased
C.
the input resistor was increased in value
D.
None of the above

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Operational Amplifiers

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3.

Which point is the trailing edge of the repetitive pulse waveform in the given circuit?

A.
Point A
B.
Point B
C.
Point C
D.
Point D

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Alternating Current and Voltage

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4.

What are the basic building blocks that all matter is composed of?

A.
electrons, neutrons, and protons
B.
two protons for each neutron
C.
two protons for each electron
D.
electrons, neutrons, and charged ions

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Voltage and Current

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5.

Which electronics material opposes the movement of free electrons?

A.
Conductor
B.
Insulator
C.
Semiconductor
D.
Element

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Voltage and Current

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6.

What is the color code for a 220 omega.gif 5% resistor?

A.
Red, Red, Brown, Gold
B.
Orange, Orange, Black, Gold
C.
Red, Red, Black, Gold
D.
Red, Red, Brown, Silver

Your Answer: Option (Not Answered)

Correct Answer: Option A

Explanation:

Resistor colour coding series:

Black   0 
Brown   1 
Red     2 
Orange  3 
Yellow  4 
Green   5 
Blue    6 
Violet  7  
Gray    8   
White   9 
None    20% 
Silver  10% 
Gold    5% 

Therefore Red, Red, Brown, Gold 
           2    2    101    5% 

 = 22 x 10 = 220 ohm 5% (tolerance). 

Learn more problems on : Voltage and Current

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7.

The 555 timer can be used in which of the following configurations?

A.
astable, monostable
B.
monostable, bistable
C.
astable, toggled
D.
bistable, tristable

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Flip-Flops and Timers

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8.

What is the quality factor?

A.
999
B.
223
C.
2.2
D.
0.99

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : RLC Circuits and Resonance

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9.

What is a shift register that will accept a parallel input and can shift data left or right called?

A.
tri-state
B.
end around
C.
bidirectional universal
D.
conversion

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Sequential Logic Circuits

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10.

If a 7.5 komega.gif resistance is connected to a 10 komega.gif inductive reactance in a series RL circuit, then the impedance equals 12.5 komega.gif .

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : RL Circuits

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11.

The small amount of ac signal present on the output of a filtering network for a dc power supply is known as ________.

A.
pulsating dc
B.
trickle
C.
ripple
D.
waffle

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Diodes and Applications

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12.

A digital logic device used as a buffer should have what input/output characteristics?

A.
high input impedance and high output impedance
B.
low input impedance and high output impedance
C.
low input impedance and low output impedance
D.
high input impedance and low output impedance

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Standard Logic Devices (SLD)

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13.

In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:

A.
swing negative
B.
close the loop
C.
be balanced
D.
swing positive

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Operational Amplifiers

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14.

What is RT for fifteen 2 M resistors all connected in parallel?

A.
133 k
B.
300 k
C.
750 k
D.
30 M

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Parallel Circuits

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15.

If you borrow from a position that contains a 0, you must borrow from the more significant bit that contains a 1. All 0s up to that point become 1s, and the digit last borrowed from becomes a 0.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Arithmetic Operations and Circuits

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16.

For P = V2/R, a decrease in resistance should produce:

A.
a decrease in power
B.
an increase in ohms
C.
an increase in power
D.
a decrease in current

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Resistance and Power

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17.

The word work means that:

A.
energy has been transferred
B.
it is inversely related to energy
C.
no energy has been transferred
D.
work and energy are not related

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Resistance and Power

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18.

Reverse biasing a pn junction allows the flow of majority current.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Diodes and Applications

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19.

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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20.

When is a vertical channel E-MOSFET used?

A.
for high frequencies
B.
for high voltages
C.
for high currents
D.
for high resistances

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Field Effect Transistors (FET)

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