1.

A compressor is also referred to as:

1. A motor

2. An air pump

3. An engine

4. All of the above

2.

Many compressors on over-the-road vehicles are cooled by:

1. Air flow

2. Cooling fins

3. Engine coolant

4. All of the above

3.

What component turns the compressor on and off?

1. The low air switch

2. The ignition switch

3. The governor

4. Both A & B

4.

The compressor discharge line should be checked for:

1. Restrictions

2. Kinks and bends

3. Carbon build up

4. All of the above

5.

What's the best way to prevent oil and water accumulation in the air system?

1. Air filter

2. An extra water trap

3. Automatic drain valve

4. Daily reservoir drains

6.

What can contribute to excessive oil passage:

1. Dirty or plugged air filters

2. The engines intake starving the compressor

3. Excessive crankcase pressures

4. All of the above

7.

The Haldex Pure Air Plus dryer does what?

1. Filters, heats and condenses

2. Cools, centrifuges and filters

3. Filters and dries

4. All of the above

8.

The isolation valve is used to:

1. Prevent over-charging of the air dryer

2. Protect the air dryer from a failure in the compressor

3. Prevents the loss of turbo boost pressure

4. None of the above

9.

Why is alcohol used in an air system?

1. Lubrication

2. Cleans the system of contaminants

3. Reduces cold weather freeze-ups

4. Both A & B

10.

The supply tank is also referred to as the

1. Second tank

2. The wet tank

3. The first tank

4. Both B & C

11.

A manual means of draining the supply tank is required by law

1. True

2. False

12.

The pop-off safety valve is preset to:

1. Cut-out pressure

2. 10 psi over cut-out pressure

3. 150 psi

4. None of the above

13.

The low air switch operates when the system:

1. Drops below the cut-in pressure

2. Is at 80 psi

3. Drops below 60 psi

4. None of the above

14.

During air compressor cut-out the governer allows wet tank air to be routed to the unloader mechanism in the compressorin order to:

1. Open the exhaust

2. Open the intake valves

3. Close the discharge

15.

Most governors are set to cut-out at:

1. 150 psi

2. 105 psi

3. 120 psi