Question

A diode can be also work as,
A. Modulator
B. Demodulator
C. Rectifier
D. Amplifier

Answer 1

Hint: A diode is an electronic device which is having two terminals which are conducting current in one direction or called as asymmetric conductance. It will have a low resistance which in ideal case will be zero in one direction and a high resistance which in ideal case will be infinite in the other. This will help you in answering this question.

Complete step by step answer:
A thermionic diode otherwise called as a diode vacuum tube is a vacuum tube having two electrodes, a plate and a heated cathode. The plate is there in which electrons can flow in only one direction. That is from cathode to plate. The most general duty of a diode is to permit an electric current to pass in one direction known as the forward direction of a diode and it will be blocking in the opposite direction called as the reverse direction. In this way the diode can be used as an electronic version of a check valve. This unidirectional nature is known as rectification, and this is useful in converting the alternating current to direct current. Thus the diode will be able to work as a rectifier. While we convert AC voltage to DC voltage, four diodes are generally used in the form of a wheatstone bridge. Hence it will be perfectly working as a rectifier.

So, the correct answer is “Option C”.

Note: The diodes can be used in switches, voltage regulators, signal modulators, signal mixers, signal demodulators, and oscillators. A semiconductor diode is used commonly today. This will be a crystalline piece of semiconductor material with a p n junction diode connected to the two electrical terminals.