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.

With 20 V applied, an 8-ohm resistor is in series with a lamp. When the lamp is removed, what voltage will be read across the lamp socket?

A.
0 V
B.
8 V
C.
12 V
D.
20 V

Your Answer: Option (Not Answered)

Correct Answer: Option D

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2.

A Schmitt trigger is a comparator with _______.

A.
modulation
B.
a closed-loop gain less than one
C.
hysteresis
D.
a high threshold value

Your Answer: Option (Not Answered)

Correct Answer: Option C

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3.

The phase angle is ______ in the given circuit.

A.
27.6°
B.
62.4°
C.
74.1°
D.
76.1°

Your Answer: Option (Not Answered)

Correct Answer: Option A

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4.

The voltage-follower amplifier circuit has a fixed voltage gain of approximately 10.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Operational Amplifiers

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5.

The number 5200 ×10–2 equals ___ × 101.

A.
0.52
B.
5.2
C.
52
D.
520

Your Answer: Option (Not Answered)

Correct Answer: Option B

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6.

When a load is not connected to the secondary of a transformer:

A.
primary current is zero
B.
primary current is inversely proportional to primary impedance
C.
secondary voltage is zero
D.
secondary voltage is proportional to primary impedance

Your Answer: Option (Not Answered)

Correct Answer: Option B

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7.

If 7.3 komega.gif, 1.8 komega.gif, and 4.9 komega.gif resistors are wired in series, the total resistance is 14 komega.gif.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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8.

If the resistance is larger than the inductive reactance in the given circuit, the phase angle is _______.

A.
less than 0°
B.
between 0° and 45°
C.
between 45° and 0°
D.
greater than 90°

Your Answer: Option (Not Answered)

Correct Answer: Option B

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9.

Current gain in a transistor is inversely proportional to collector current.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

Learn more problems on : Bipolar Junction Transistors (BJT)

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10.

What is the total resistance?

mcq4_1007_1.gif

A.
7 k
B.
1 k
C.
706
D.
353

Your Answer: Option (Not Answered)

Correct Answer: Option D

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11.

What is the product-over-sum result of 150 and 6800?

A.
150
B.
146.7
C.
0.006
D.
6800

Your Answer: Option (Not Answered)

Correct Answer: Option B

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12.

What is the transconductance of an FET when ID = 1 mA and VGS = 1 V?

A.
1 kS
B.
1 mS
C.
1 k
D.
1 m

Your Answer: Option (Not Answered)

Correct Answer: Option B

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13.

One advantage of using the 2's complement system to represent signed numbers is that you ___________.

A.
can perform subtraction by performing addition
B.
can perform addition by performing subtraction
C.
can perform division through repeated subtraction
D.
none of the above

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Arithmetic Operations and Circuits

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14.

NMOS devices use MOSFETs to implement the full range of logic gates using the universal NAND gate.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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15.

Regardless of whether the transformer is step-up or step-down, power in the primary equals the power in the secondary if there is 100% efficiency.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option A

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16.

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

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17.

A zener diode can be tested with an ohmmeter.

A.
True
B.
False

Your Answer: Option (Not Answered)

Correct Answer: Option B

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18.

Power is defined as:

A.
the rate at which energy is used
B.
watts
C.
energy
D.
the rate at which energy is generated

Your Answer: Option (Not Answered)

Correct Answer: Option A

Learn more problems on : Resistance and Power

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19.

What causes the piezoelectric effect?

A.
heat or dissimilar metals
B.
pressure on a crystal
C.
water running on iron
D.
a magnetic field

Your Answer: Option (Not Answered)

Correct Answer: Option B

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20.

What is the phase shift between the voltage across the resistor and the voltage from the source?

A.
VR leads VS by 17°
B.
VR leads VS by 73°
C.
VR lags VS by 73°
D.
VR lags VS by 17°

Your Answer: Option (Not Answered)

Correct Answer: Option B

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