Question

A p-n junction diode cannot be used
A. as a rectifier
B. for converting light energy to electric energy
C. for getting light radiation
D. for increasing the amplitude of an AC signal

Answer 1

Hint: We know that to increase the amplitude of an ac signal, transistors are used. p-n junction diodes can be used as rectifiers, photo-diodes and LEDs.

Complete step by step solution:
We know that the junction diodes are small two-terminals that conduct current when forward biased and block current flow when reverse biased. The semiconductor p-n junction diode is a small non-linear semiconductor device generally used in electronic circuits, where small currents are involved such as in radio, television, and digital logic circuits. Therefore, a p-n junction diode cannot be used for increasing the amplitude of an AC signal.

A p-n junction can be used as a rectifier because of its asymmetric current/voltage properties that enable current to flow in only one way and it converts light energy to electric energy as well as getting light radiation.

Hence, option(D) is the correct

Additional information: The main application of the p-n junction diode is in rectification circuits. These circuits are used to describe the conversion of ac signals to dc in power supplies. The diode rectifier gives an alternation voltage that pulsates over time.

Note:Amplification cannot be achieved with a diode. When the potential is placed in the back, the junction prevents electrons from flowing in the opposite direction, thus acting as an electrical stopcock.