Thank you for taking our Service Technicians Skill / Knowledge Test.

Loading...

1

Service Technician Skill / Knowledge Test

General Shop Knowledge, Tools, and Safety

1. MSDS sheets:

Select a choice

2. A metric bolt can be identified by the fact that:

Select a choice

3. Used Engine oil:

 

Select a choice

4. The head of the bolt shown below indicates: 

Grade 5

Select a choice

5. 0 - 1" micrometer is used to take a measurement on a wrist pin for wear. The micrometer appears as shown. The pin diameter is: 

Picture2

Select a choice

Power Trains / Drivelines

Use the diagram below for Questions 1 and 2.

gears

 

1. What is the shaft speed (rpm) of the driven gear?

Select a choice

2. What is the shaft speed (rpm) of the idler gear?

Select a choice

3. Which of the following is the proper name for a toothed belt drive System?

Select a choice

4. Generally, the larger the pitch of a roller chain.

Select a choice

5. Overtightening a v-belt drive will:

Select a choice

Engine Basics 

1. Which of the following list of engine oils is the best suited for a wide range of operating temperatures?

Select a choice

2. Valve tappet clearance that are set too small:

Select a choice

3. A Catalyzed DPF (Diesel Particulate Filter) requires oil with which of the following characteristics?


Select a choice

4. A 4 stroke cycle diesel engine operates at 1800 rpm. The injector In each cylinder delivers fuel to the cylinder_ times every second:

Select a choice

5. Compression releases are sometimes used on engines to:

Select a choice

Air Conditioning Systems 

1. A vacuum pump is being used to evacuate a system prior to charging. The system has been successfully evacuated. After the vacuum pump is shut off and the valve to the pump is shut off, the vacuum gauge shows a slow, but steady loss of vacuum, Which of the following is true?

Select a choice

2. Which of the problems listed below will cause the manifold gauge readings shown in the illustration?

AC

Select a choice

3. The ideal operating temperature of the evaporator is:

Select a choice

4. The condenser in an air conditioning system:  

Select a choice

5. To charge an air conditioning system while it is running, the
refrigerant should be added to:

Select a choice

Hydraulics

1. What spool position allows oil to freely flow in and out of a connected cylinder in either direction?

Select a choice

2. The micron rating of a filter refers to:

Select a choice

3. How much horsepower would be required to pump 20 gpm at 1500 psi? Hydraulic horsepower= P (psi) x Q (qpm)/1714.

Select a choice

4. The purpose of a system relief valve is to :

Select a choice

5. In the diagram shown below, the valve immediately to the right of the pump is a ______ valve.

Picture7

Select a choice

Engine Troubleshooting / Tune-up 

1. A clogged air filter will cause the:

Select a choice

2. Technician A says old antifreeze may cause corrosion build-up in the cooling system.  Technician B says some original equipment manufacturers (OEM) recommend that the coolant be changed at specified intervals.  Who is right?

Select a choice

3. When draining used engine oil from a 4 stroke cycle engine, it is best to:

Select a choice

4. Diesel fuel left in an engine that has not run for an extended Period of time:

Select a choice

5. An appropriate check or inspection to perform on an engine which runs hot is:

Select a choice

Electrical Principles

1. An ammeter is used to test a charging circuit. Is should be Connected:

Select a choice

2. A continuity test is done to check for:

Select a choice

3. A voltmeter is connected:

Select a choice

4. When current flows in both directions in a conductor, this is called:

Select a choice

5. The resistance of a switch increases due to corrosion of the contacts. If voltage remains constant, the current flow through the switch will:

Select a choice

Diesel Engines

1. A variety of shut-down and safety devices are used on diesel powered equipment. Which of the following is NOT a possible reason/cause for a diesel engine to shut down?

Select a choice

2. Cylinder, piston, and piston ring wear can be detected by:

Select a choice

3. Which of the following should be the first step in diagnosing an engine performance concern?            


Select a choice

4. Regarding governors on diesel engines:

Select a choice

5. a plugged or restricted air filter will result in:

Select a choice

Electrical Circuits and Schematics

Use Diagram E-1 below it will help you answer questions 1, 2, and 3. 

1) The charging system is to be checked with a volt-ohm meter for proper operation. The battery voltage is 13.6 volts when the engine is shut off. Voltage at terminal [email protected] is 14.2 volts when the engine is running at mid-speed. Which of the following would be an accurate conclusion regarding the charging system?

Select a choice

2) This system regulates the alternator output (charging) voltage by:

Select a choice

3) The charging system seems to be operating properly. However, the machine battery slowly discharges when the machine is idle. Eventually, the battery drains completely. Which of the following could cause this problem?

Select a choice

Use Diagram E-2 below it will help you answer questions 4, and 5 

4) Battery voltage of 12.9 volts is read with a volt ohm-meter between checkpoint A and ground. There is no voltage at checkpoint L. Which of the following is responsible for this situation?

Select a choice

5) The starter falls to turn the engine over when the key switch is turned to [email protected] The battery has adequate voltage. The same voltage is also read at points C, F, and H, and I when the switch is held to the [email protected] position. The problem Is:

Select a choice

Diagram E-1. The following diagram is used for questions 1, 2, and 3

Picture8

 

Diagram E-2. The following is used for question 4, and 5 

Picture9

Revised 3/19/2021