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 a BCD-to-seven-segment converter, why must a code converter be utilized?

A.
No conversion is necessary.
B.
to convert the 4-bit BCD into gray code
C.
to convert the 4-bit BCD into 10-bit code
D.
to convert the 4-bit BCD into 7-bit code

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Combinational Logic Circuits

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2.

How many NAND circuits are contained in a 7400 NAND IC?

A.
1
B.
2
C.
4
D.
8

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Logic Gates

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3.

What happens when moving expanding lines of force encounter a conductor?

A.
Current increases.
B.
Voltage is induced.
C.
Resistance is reduced.
D.
Power is increased.

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Inductors

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4.

The number 24.5, rounded to two significant digits, is 25.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Quantities and Units

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5.

Resistance is the same as impedance in an RC circuit.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : RC Circuits

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6.

Initially, the closed-loop gain (Acl) of a Wien-bridge oscillator should be

A.
Acl < 3
B.
Acl > 3
C.
0
D.
Acl approxequalto.gif 1

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Basic Op-Amp Circuits

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7.

What starts a free-running multivibrator?

A.
a trigger
B.
an input signal
C.
an external circuit
D.
nothing

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Operational Amplifiers

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8.

A sine wave reaches maximum positive voltage at:

A.
90°
B.
C.
–90°
D.
360°

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Alternating Current vs Direct Current

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9.

In the given circuit, the voltage dropped across R1 equals _____.

A.
1 V
B.
9 V
C.
10 V
D.
19 V

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Series-Parallel Circuits

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10.

The total current entering a junction may be different from the total current leaving the junction.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Parallel Circuits

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11.

The main purpose of an instrumentation amplifier is to amplify small signals riding on large common-mode voltages.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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

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12.

A capacitor has 25 V across its plates and a stored charge of 1500 mu.gifC. What is the capacitance value?

A.
60 pF
B.
60 mu.gifF
C.
16.67 mF
D.
37.5 mF

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Capacitors

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13.

An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?

A.
1 volt
B.
3 volts
C.
5 volts
D.
7 volts

Your Answer: Option (Not Answered)

Correct Answer: Option D

Learn more problems on : Capacitors

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14.

What is the current through the zener diode?

mcq11_1011_1.gif

A.
0 mA
B.
7 mA
C.
8.3 mA
D.
13 mA

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Diodes and Applications

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15.

What is wrong with this diode?

A.
open
B.
short
C.
nothing
D.
not enough data

Your Answer: Option (Not Answered)

Correct Answer: Option C

Learn more problems on : Diodes and Applications

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16.

Which statement below best describes a Karnaugh map?

A.
It is simply a rearranged truth table.
B.
The Karnaugh map eliminates the need for using NAND and NOR gates.
C.
Variable complements can be eliminated by using Karnaugh maps.
D.
A Karnaugh map can be used to replace Boolean rules.

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Logic Circuit Simplification

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17.

When a transistor is operating as a variable resistor it has transistance.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Bipolar Junction Transistors (BJT)

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18.

For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction?

A.
collector-emitter
B.
base-emitter
C.
collector-base
D.
cathode-anode

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Bipolar Junction Transistors (BJT)

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19.

A compiler is a translation program that converts high-level instructions into a set of binary instructions (machine code) for execution.

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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20.

Increasing the number of magnetic poles in a basic generator will ___.

A.
increase the generator's output voltage amplitude
B.
increase the generator's output frequency
C.
decrease the generator's output voltage amplitude
D.
decrease the generator's output frequency

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Alternating Current and Voltage

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