Element 9 C question 59

Question:

figure 9-C4
9C59 The purpose of the diode in the circuit shown on Figure 9C-4 is to:
 
A. Speed switching time.
B. Protect the transistor.  [correct answer]
C. Increase current capacity.
D. Compensate for thermal variations.

Challenger's excerpt:

In the FCC question pool there is an associated schematic in which the diode appears to be in a back-EMF configuration in parallel with a (possible) relay coil, meaning it is probably to protect the FET.

Response:

Challenger is correct.  The active device is a FET, not a transistor.

Recommendation:

Change question to:

figure 9-C4
9C59 The purpose of the diode in the circuit shown on Figure 9C-4 is to:
 
A. Speed switching time.
B. Protect the FET. [correct answer]
C. Increase current capacity.
D. Compensate for thermal variations.