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Online Electronics Test - Electronics Test - Random

Instruction:
  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
  • DO NOT refresh the page.
  • All the best!

Marks : 2/20

Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.
1.
Power supplies differ from batteries in that
power supply output voltages are ac and not dc
power supply voltages are not stable
power supplies are low-current devices
None of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option
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Learn more problems on : Ohm's Law
2.
Kirchhoff’s voltage law states that:
the sum of the voltage drops in a series circuit is equal to the total applied voltage
the algebraic sum of the resistances is equal to the sum of the voltages
the algebraic sum of the individual currents around a closed loop is zero
the voltages developed across each element in a series circuit are identical
Your Answer: Option
(Not Answered)
Correct Answer: Option
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Learn more problems on : Series Circuits
3.
If series resistors dissipate 16 mW, 107 mW, 146 mW, and 243 mW, what is the total power consumed by the circuit?
128 mW
269 mW
512 mW
1024 mW
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Correct Answer: Option
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Learn more problems on : Series Circuits
4.
Kirchhoff's current law states that the current flowing into a point of a circuit is equal to the sum of the voltages in the output branches.
True
False
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Correct Answer: Option
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Learn more problems on : Parallel Circuits
5.

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

86 mA
170 mA
42 mA
128 mA
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Correct Answer: Option
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Learn more problems on : Parallel Circuits
6.
What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?
12,000 mu.gifT
83,330 T
0 T
More information is needed in order to find flux density.
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Correct Answer: Option
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Learn more problems on : Magnetism and Electromagnetism
7.
Ferromagnetic materials have minute magnetic ___ created within their atomic structure by the orbital motion and spin of electrons.
forces
flux lines
domains
tapes
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Learn more problems on : Magnetism and Electromagnetism
8.
What is the effect of increasing the resistance in a series RC circuit?
There will be no effect at all.
The current will increase.
The phase shift will decrease.
The input voltage will increase.
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Learn more problems on : RC Circuits
9.
The current through an inductor in a parallel RL circuit leads the current through the resistor.
True
False
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Correct Answer: Option
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Learn more problems on : Inductors
10.
What is the magnitude of the phase angle of a 24 Vac parallel RL circuit when R = 45 omega.gif and XL = 1100 omega.gif?
0.001°
2.3°
87.6°
89.9°
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Learn more problems on : RL Circuits
11.
If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.
True
False
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Correct Answer: Option
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Learn more problems on : Transformers
12.
A(n) ___ is sometimes constructed as a variable transformer.
autotransformer
center-tapped transformer
multiple-tap transformer
multiple-winding transformer
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Learn more problems on : Transformers
13.
The characteristic curve for the complex model of a silicon diode shows that
the barrier potential is 0 V
the barrier potential stays fixed at 0.7 V
the barrier potential increases slightly with an increase in current
the barrier potential decreases slightly with an increase in current
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Learn more problems on : Diodes and Applications
14.
The PIV rating of a diode in a full-wave bridge rectifier is more than that required for a full-wave center-tapped configuration.
True
False
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Learn more problems on : Diodes and Applications
15.
This circuit is operating in a closed-loop mode.

True
False
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Correct Answer: Option
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Learn more problems on : Operational Amplifiers
16.
If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by 2.
True
False
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(Not Answered)
Correct Answer: Option
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Learn more problems on : Operational Amplifiers
17.
The gain of an OTA is the ratio of the output current to the input voltage, and is measured in _____________.
amps
volts
siemens
no units
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Learn more problems on : Special-Purpose Op-Amp Circuits
18.
The magnitude that an alternation varies from zero is called its:
altitude
amplitude
attitude
polarity
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(Not Answered)
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Learn more problems on : Alternating Current vs Direct Current
19.
A Karnaugh map will ____________________.
eliminate the need for tedious Boolean expressions
allow any circuit to be implemented with just AND and OR gates
produce the simplest sum-of-products expression
give an overall picture of how the signals flow through the logic circuit
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Learn more problems on : Logic Circuit Simplification
20.
An open collector output can ________ current, but it cannot ___________________.
sink, source current
source, sink current
sink, source voltage
source, sink voltage
Your Answer: Option
(Not Answered)
Correct Answer: Option
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Learn more problems on : Standard Logic Devices (SLD)
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