Question 121:
easyZener diode is used as:
(1999)
When connected in reverse bias in parallel with a load, a Zener diode provides a constant DC output voltage regardless of minor fluctuations in the input DC voltage or load current, functioning perfectly as a D.C. voltage stabilizer.
Question 122:
easyIn a p-n junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to:
(2005, 2004)
The photo-electromotive force generated in a photocell is directly proportional to the number of electron-hole pairs created per second. This pair generation rate depends strictly on the number of incident photons, which defines the intensity of the incident light.
Question 123:
easyFor an electronic valve, the plate current I and plate voltage V in the space charge limited region are related as
(1992)
According to the Child-Langmuir law governing thermionic diodes (electronic valves) in the space-charge limited region, the plate current is directly proportional to the three-halves power of the plate voltage, establishing the relationship $I \propto V^{3/2}$.