A good diode checked by a multimeter should indicate:

Question

Monascus purpureus is a yeast used commercially in the production of which one of the following?

Answer 1

To check a diode's functionality using a multimeter, it's essential to understand how diodes behave in different bias conditions:

In forward bias (positive voltage on the anode relative to the cathode), a good diode allows current to flow easily. Hence, it should indicate low resistance.
In reverse bias (positive voltage on the cathode relative to the anode), a good diode blocks current flow. Thus, it should indicate high resistance.

Therefore, when checking a good diode with a multimeter:

Forward Bias: Connect the positive lead to the anode and the negative lead to the cathode. The resistance reading should be low.
Reverse Bias: Connect the positive lead to the cathode and the negative lead to the anode. The resistance reading should be high.

Based on this understanding, the correct answer is: high resistance in reverse bias and a low resistance in forward bias.

The other options can be ruled out as follows:

High resistance in both forward bias and reverse bias: This would indicate that the diode is not conducting properly in forward bias.
Low resistance in both reverse bias and forward bias: This scenario suggests that the diode has failed and is allowing current in both directions, indicating a shorted diode.
High resistance in forward bias and low resistance in reverse bias: This configuration is incorrect for a typical diode, as it should conduct in forward bias and block in reverse.

Answer 2

To check a diode's functionality using a multimeter, it's essential to understand how diodes behave in different bias conditions:

In forward bias (positive voltage on the anode relative to the cathode), a good diode allows current to flow easily. Hence, it should indicate low resistance.
In reverse bias (positive voltage on the cathode relative to the anode), a good diode blocks current flow. Thus, it should indicate high resistance.

Therefore, when checking a good diode with a multimeter:

Forward Bias: Connect the positive lead to the anode and the negative lead to the cathode. The resistance reading should be low.
Reverse Bias: Connect the positive lead to the cathode and the negative lead to the anode. The resistance reading should be high.

Based on this understanding, the correct answer is: high resistance in reverse bias and a low resistance in forward bias.

The other options can be ruled out as follows:

High resistance in both forward bias and reverse bias: This would indicate that the diode is not conducting properly in forward bias.
Low resistance in both reverse bias and forward bias: This scenario suggests that the diode has failed and is allowing current in both directions, indicating a shorted diode.
High resistance in forward bias and low resistance in reverse bias: This configuration is incorrect for a typical diode, as it should conduct in forward bias and block in reverse.

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