Rectifiers & Filters MCQs

Practice Rectifiers & Filters MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Electronic Devices & CircuitsRectifiers & Filters

For an ideal full-wave rectified sine wave with peak value Vm, the average DC output voltage is?

AVm/pi
B2Vm/pi
CVm/2
DVm/sqrt(2)

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Correct Answer: B. 2Vm/pi

Explanation: Full-wave rectification makes both half-cycles positive, giving an average value of 2Vm/pi, approximately 0.637Vm.

Reference: Standard electronics: full-wave rectifier

Question 2

Electronic Devices & CircuitsRectifiers & Filters

If the AC supply frequency is 50 Hz, the ripple frequency at the output of an ideal full-wave rectifier is?

A25 Hz
B50 Hz
C100 Hz
D200 Hz

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Correct Answer: C. 100 Hz

Explanation: A full-wave rectifier produces two output pulses per input cycle, so its ripple frequency is twice the supply frequency: 100 Hz.

Reference: Standard electronics: rectifier ripple frequency

Question 3

Electronic Devices & CircuitsRectifiers & Filters

For a half-wave rectifier supplied by a sinusoidal source of peak value Vm and using an ideal diode, the average DC output voltage is?

AVm/2
BVm/pi
C2Vm/pi
DVm/sqrt(2)

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Correct Answer: B. Vm/pi

Explanation: The average value of one positive half-cycle over a complete cycle is Vm/pi, approximately 0.318Vm.

Reference: Standard electronics: half-wave rectifier

Question 4

Electronic Devices & CircuitsRectifiers & Filters

A capacitor filter connected across a rectifier load primarily reduces ripple by?

ACharging near voltage peaks and discharging through the load between peaks
BBlocking all DC current
CIncreasing the supply frequency
DMaking the diode permanently reverse biased

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Correct Answer: A. Charging near voltage peaks and discharging through the load between peaks

Explanation: The capacitor charges when the rectified voltage rises and supplies load current while the rectified input falls, smoothing the output voltage.

Reference: Standard electronics: capacitor filter

Question 5

Electronic Devices & CircuitsRectifiers & Filters

For an ideal half-wave rectifier with a resistive load, the maximum rectification efficiency is approximately?

A20.3%
B40.6%
C81.2%
D100%

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Correct Answer: B. 40.6%

Explanation: The theoretical maximum rectification efficiency of an ideal half-wave rectifier is approximately 40.6%.

Reference: Standard electronics: rectifier efficiency

Question 6

Electronic Devices & CircuitsRectifiers & Filters

For an ideal full-wave rectifier with a resistive load, the maximum rectification efficiency is approximately?

A40.6%
B50%
C81.2%
D100%

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Correct Answer: C. 81.2%

Explanation: The theoretical maximum rectification efficiency of an ideal full-wave rectifier is approximately 81.2%.

Reference: Standard electronics: full-wave rectifier efficiency

Question 7

Electronic Devices & CircuitsRectifiers & Filters

For an ideal half-wave rectifier without a filter, the ripple factor is approximately?

A0.482
B1.21
C1.414
D2.0

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Correct Answer: B. 1.21

Explanation: The standard ripple factor of an unfiltered ideal half-wave rectifier is approximately 1.21.

Reference: Standard electronics: half-wave rectifier ripple factor

Question 8

Electronic Devices & CircuitsRectifiers & Filters

For an ideal full-wave rectifier without a filter, the ripple factor is approximately?

A0.482
B1.21
C1.57
D2.0

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Correct Answer: A. 0.482

Explanation: The standard ripple factor of an unfiltered ideal full-wave rectifier is approximately 0.482, lower than that of a half-wave rectifier.

Reference: Standard electronics: full-wave rectifier ripple factor

Question 9

Electronic Devices & CircuitsRectifiers & Filters

For a center-tapped full-wave rectifier, if Vm is the peak voltage across one half of the transformer secondary, the peak inverse voltage across each ideal diode is?

AVm
B2Vm
CVm/2
D4Vm

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Correct Answer: B. 2Vm

Explanation: In a center-tapped full-wave rectifier, the nonconducting diode can see approximately twice the peak voltage of one half-secondary, so PIV = 2Vm.

Reference: Standard electronics: rectifier PIV

Question 10

Electronic Devices & CircuitsRectifiers & Filters

For an ideal bridge rectifier whose transformer secondary has peak voltage Vm, the peak inverse voltage across each diode is approximately?

AVm
B2Vm
C4Vm
DVm/2

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Correct Answer: A. Vm

Explanation: In an ideal bridge rectifier, each reverse-biased diode must withstand approximately the peak secondary voltage Vm.

Reference: Standard electronics: bridge rectifier PIV

Question 11

Electronic Devices & CircuitsRectifiers & Filters

In a capacitor-input rectifier filter, increasing the load resistance while other parameters remain fixed generally causes ripple voltage to?

AIncrease
BDecrease
CRemain exactly unchanged
DBecome equal to the supply voltage

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Correct Answer: B. Decrease

Explanation: A larger load resistance reduces load current and slows capacitor discharge between charging peaks, thereby reducing ripple.

Reference: Standard electronics: capacitor-filter ripple

Question 12

Electronic Devices & CircuitsRectifiers & Filters

For a full-wave rectifier with a capacitor filter, increasing the filter capacitance while load and frequency remain fixed generally causes ripple to?

AIncrease
BDecrease
CBecome independent of load current
DDouble exactly

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Correct Answer: B. Decrease

Explanation: A larger capacitance stores more charge and its voltage falls less between rectified peaks, reducing ripple.

Reference: Standard electronics: rectifier filtering

Question 13

Electronic Devices & CircuitsRectifiers & Filters

For a bridge rectifier, the peak inverse voltage across each ideal diode is approximately?

AVm
B2Vm
CVm/2
D4Vm

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Correct Answer: A. Vm

Explanation: In a standard bridge rectifier, each nonconducting diode must withstand approximately the peak secondary voltage Vm, unlike a center-tapped full-wave rectifier where the PIV is approximately 2Vm.

Reference: Standard electronics: bridge rectifier PIV

Question 14

Electronic Devices & CircuitsRectifiers & Filters

For a center-tapped full-wave rectifier with each half-secondary having peak voltage Vm, the approximate PIV rating required for each diode is?

AVm/2
BVm
C2Vm
D4Vm

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Correct Answer: C. 2Vm

Explanation: When one diode conducts, the other can see approximately twice the peak voltage of one half-secondary, so PIV≈2Vm.

Reference: Standard electronics: center-tapped rectifier PIV

Question 15

Electronic Devices & CircuitsRectifiers & Filters

For an ideal half-wave rectifier without a filter, the maximum theoretical rectification efficiency is approximately?

A20.3%
B40.6%
C81.2%
D100%

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Correct Answer: B. 40.6%

Explanation: The standard maximum rectification efficiency of an ideal half-wave rectifier is about 40.6%.

Reference: Standard electronics: half-wave rectifier efficiency

Question 16

Electronic Devices & CircuitsRectifiers & Filters

For an ideal full-wave rectifier without a filter, the maximum theoretical rectification efficiency is approximately?

A40.6%
B50%
C81.2%
D100%

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Correct Answer: C. 81.2%

Explanation: The standard maximum rectification efficiency of an ideal full-wave rectifier is approximately 81.2%.

Reference: Standard electronics: full-wave rectifier efficiency