Question 1
Marks : +2 | -2
Pass Ratio : 100%
A diode on being checked by a DDM with diode checking function results in an open loop indication in both directions. Which of the following is the correct inference drawn from the given situation?
Explanation: A diode allows electrical conduction in just one direction. Hence, if an instrument shows an open loop indication in both the directions, then the diode is faulty.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
How can the location of the Zener region be controlled in the diode characteristic curve?
Explanation: An increase in doping will lead to an increase in the concentration of impurities, which would further lead to a change in VZ and hence change in the Zener region.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
A silicon semiconductor diode when subjected to ohmmeter testing gives low resistance in both directions. Which of the following is the correct inference to be drawn?
Explanation: A proper diode gives a low resistance reading along one direction and high resistance reading along the other. Hence, if diode gives low resistance readings in both directions, then the diode must be short-circuited. It’s noteworthy that a faulty diode gives a high resistance reading along both paths.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
A silicon semiconductor diode when subjected to ohmmeter testing gives high resistance in both directions. Which of the following is the correct inference to be drawn?
Explanation: A proper diode gives a low resistance reading along one direction and high resistance reading along the other. Hence, if diode gives high resistance readings in both directions, then the diode must be faulty.