Which gauge response is normal after starting the engine?
Correct answer: B – The coolant-temperature gauge gradually rises toward its normal range.
After the engine starts, the coolant-temperature gauge should begin a gradual rise toward the normal operating range. Oil pressure should reach its normal range within seconds, not several minutes. In an air-brake vehicle, pressure should also build at the rate specified for the system rather than taking 10 to 15 minutes.
Source: Nevada Commercial Driver License Handbook — § 2.1.5, “Seven-Step Inspection Method—Step 7: Start the Engine and Check”

