Free Rectification MCQs with Answers
37 Rectification MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Rectification converts alternating current into unidirectional current using semiconductor diodes. The content includes half wave and full wave rectifiers, bridge circuits, output waveforms, ripple and smoothing with capacitors, with the difference between rectification and voltage regulation kept clear.
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37 questions · page 1 of 2
- A. direct current to alternating current
- B. alternating current to direct current
- C. low voltage to high voltage
- D. current to voltage
Explanation: A diode conducts in one direction only, so it can strip out one half of the alternating cycle and leave a unidirectional output.
Correct answer: alternating current to direct current- A. uses both halves of the input cycle
- B. consists of one half cycle only, with the other half missing
- C. is a steady direct voltage
- D. is zero
Explanation: The single diode conducts only while its anode is positive, so alternate half cycles are blocked and the output is a series of pulses with…
Correct answer: consists of one half cycle only, with the other half missing- A. one diode
- B. two diodes
- C. four diodes
- D. no diodes
Explanation: Four diodes arranged in a bridge route both halves of the cycle through the load in the same direction, so the output has twice the pulse…
Correct answer: four diodes- A. an amplifier
- B. a smoothing element, charging at the peaks and discharging between them to reduce ripple
- C. a switch
- D. an oscillator
Explanation: The capacitor stores charge while the rectified voltage rises and releases it while the voltage falls, filling in the troughs so the…
Correct answer: a smoothing element, charging at the peaks and discharging between them to reduce ripple- A. 25 Hz
- B. 50 Hz
- C. 100 Hz
- D. 200 Hz
Explanation: Both halves of each cycle produce an output pulse, so there are two pulses per input cycle and the ripple appears at twice the supply…
Correct answer: 100 Hz- A. Equal to D.C. value
- B. More than D.C. value
- C. Less than D.C. value
- D. Zero
Explanation: For a half-wave rectified sine wave with peak current I0, the total rms current is I0/2 and the DC current is I0/pi.
Correct answer: More than D.C. value- A. Converter
- B. A rectifier
- C. Inverter
- D. Oscillator
Explanation: An inverter uses electronic switching to convert direct current into alternating current.
Correct answer: Inverter8. In half-wave rectification the output D.C. voltages is obtained across the load for_______________?
- A. The negative half cycle of A.C.
- B. The positive half cycle of A.C.
- C. The positive and negative half cycles
- D. Either positive or negative half of A.C.
Explanation: In a half-wave rectifier, the diode conducts during only one half-cycle and blocks the other half-cycle, producing output across the load…
Correct answer: The positive half cycle of A.C.- A. The positive half cycle of input A.C.
- B. The negative half cycle of input A.C.
- C. The complete cycle of input A.C.
- D. All of the above.
Explanation: A full-wave rectifier uses both the positive and negative half cycles of the AC input, but reverses the negative half so the load current…
Correct answer: The complete cycle of input A.C.- A. using a transistor
- B. suppressing the harmonics in A.C voltage
- C. suppressing half wave of A.C supply by using diode
- D. using a Coolidge tube
Explanation: A diode conducts readily in forward bias and blocks current in reverse bias, so placing it in an AC circuit allows one half cycle to pass…
Correct answer: suppressing half wave of A.C supply by using diode- A. An amplifier.
- B. A rectifier
- C. Filtering circuit
- D. Converter.
Explanation: A rectifier changes alternating voltage or current into a unidirectional, pulsating DC output, usually by using diodes.
Correct answer: A rectifier- A. It has low resistance to the current flow when forward biased & high resistance when reverse biased.
- B. It has low resistance to the current flow when forward biased.
- C. It has high resistance to the current flow when reverse biased
- D. Its conductivity increases with rise of temperature.
Explanation: A diode rectifies because its low forward resistance permits substantial current in one direction, while its high reverse resistance…
Correct answer: It has low resistance to the current flow when forward biased & high resistance when reverse biased.- A. 25
- B. 50
- C. 100
- D. 75
Explanation: Option A) 25 is not correct because it does not correspond to the frequency of the AC input or the number of pulses in the rectifier…
Correct answer: 50- A. Lower half cycle
- B. Upper half cycle
- C. Both cycles
- D. None of them
Explanation: The rectifier circuit that converts alternating current into the direct current is known as a halfwave rectifier circuit.
Correct answer: Upper half cycle- A. 80.6%
- B. 40.6%
- C. 70%
- D. 50%
Explanation: The maximum efficiency of a half-wave rectifier is about 40.6%. This is because it only utilizes one half of the AC waveform, leading to…
Correct answer: 40.6%- A. AC to DC
- B. DC to AC
- C. AC to triangular current
- D. DC-to-triangular current
Explanation: A rectifier is a device that converts an oscillating two-directional alternating current (AC) into a single-directional direct current…
Correct answer: AC to DC- A. 1
- B. 2
- C. 3
- D. 4
Explanation: For full wave rectification, the minimum number of diodes required is two (This is for a center-tapped full wave rectifier…
Correct answer: 2- A. Only positive half of input cycle
- B. Only negative half of input cycle
- C. Both halves of input cycle
- D. Any one half of input cycle
Explanation: In a half-wave rectifier, the diode conducts during the only positive half of the input cycle.
Correct answer: Only positive half of input cycle- A. -1
- B. 0
- C. +1
- D. infinite
Explanation: In a non-inverting operational amplifier, the gain is given by 1 + (R2/R1).
Correct answer: +1- A. A
- B. B
- C. C
- D. D
Explanation: The NAND gate produces an output of 0 only when all its inputs are 1. Otherwise, it outputs 1.
Correct answer: BRectification MCQs: common questions
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