Diode as a half-wave and full-wave rectifier — NEET & JEE Questions

Question 1 · difficulty L1 · recall

A rectifier converts

• A. alternating voltage/current into a unidirectional output
• B. DC into AC
• C. light into sound only
• D. resistance into capacitance

Question 2 · difficulty L1 · understanding

A basic half-wave rectifier uses

• A. four diodes to pass no half-cycle
• B. one diode to pass one half-cycle
• C. a transistor only
• D. no nonlinear element

Question 3 · difficulty L2 · understanding

A full-wave rectifier uses

• A. only the positive half-cycle
• B. only every second input cycle
• C. both half-cycles of the AC input to produce the same output polarity
• D. no diodes

Question 4 · difficulty L2 · application

For a full-wave rectified sine wave supplied from frequency f, the ripple repetition frequency is

• A. f/2
• B. f
• C. 4f
• D. 2f

Question 5 · difficulty L2 · understanding

The main purpose of a rectifier circuit is to convert

• A. alternating current into unidirectional pulsating current
• B. direct current into alternating current
• C. light into electrical energy
• D. heat into mechanical work

Question 6 · difficulty L3 · application

For an ideal half-wave rectifier with sinusoidal peak output Vm, the average output over a cycle is

• A. Vm/π
• B. 2Vm/π
• C. Vm/sqrt(2)
• D. zero

Question 7 · difficulty L3 · application

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

• A. Vm/π
• B. 2Vm/π
• C. Vm/2
• D. zero

Question 8 · difficulty L3 · application

In an ideal half-wave rectifier supplied by a sinusoidal AC source, the load current flows during

• A. one half-cycle only
• B. both half-cycles in the same direction
• C. neither half-cycle
• D. only when the source voltage is zero

Question 9 · difficulty L3 · application

Compared with a half-wave rectifier, an ideal full-wave rectifier produces output pulses at

• A. twice the input AC frequency
• B. half the input frequency
• C. the same pulse frequency as half-wave rectification
• D. zero frequency

Question 10 · difficulty L4 · analysis

Why is a filter capacitor often connected after a rectifier?

• A. To reverse the diode direction each half-cycle
• B. To increase AC ripple intentionally
• C. To reduce ripple by storing and releasing charge between voltage peaks
• D. To make the transformer work on DC