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Q 1/19
Score 0
A technician performing a cylinder compression test on a four-stroke internal combustion engine finds that one cylinder has significantly lower pressure than the others. When a small amount of engine oil is added to the cylinder and the test is repeated, the pressure reading increases significantly. What is the most likely cause of the low compression?
30
Cracked cylinder head
Worn piston rings
Blown head gasket
Leaking intake valve
Q 2/19
Score 0
30
19 questions
Q.
A technician performing a cylinder compression test on a four-stroke internal combustion engine finds that one cylinder has significantly lower pressure than the others. When a small amount of engine oil is added to the cylinder and the test is repeated, the pressure reading increases significantly. What is the most likely cause of the low compression?
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30 sec
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7
30 sec
Q.
An engine undergoes an engine mechanical test where the technician observes a blue-grey smoke from the tailpipe during deceleration only. Which of the following is the most likely cause?
8
30 sec
Q.
While conducting a cylinder power balance test on a fuel-injected engine, a technician notices that the Engine Speed (RPM) does not drop when the fuel injector for cylinder number 3 is disabled. Which of the following is the most likely cause?
9
30 sec
Q.
If a technician finds that an engine has high compression in all cylinders, but the engine is overheating and 'pinging' (detonating) under load, which of the following is the most likely cause?
10
30 sec
Q.
A technician is performing a cylinder leakage test and notices air bubbles escaping from the radiator filler neck. What is the most likely cause of this condition?
11
30 sec
Q.
While conducting a cylinder leakage (leak-down) test, a technician hears air escaping from the throttle body while cylinder #1 is at Top Dead Center (TDC) on its compression stroke. What is the most likely cause of this issue?
12
30 sec
Q.
13
30 sec
Q.
A technician is evaluating an engine's cooling system performance using an infrared thermometer. The upper radiator hose is found to be significantly hotter than the lower radiator hose while the engine is at operating temperature. What does this temperature differential primarily indicate?
14
30 sec
Q.
Technician A says that a restricted exhaust system can cause low engine vacuum at high engine speeds. Technician B says that a clogged fuel filter can cause the engine to stumble during acceleration. Who is correct?
15
30 sec
Q.
An engine undergoes a cylinder leakage test and air is heard blowing out of the oil filler cap opening. Which of the following is the most likely cause?
16
30 sec
Q.
17
30 sec
Q.
While diagnosing a vehicle with a 'Cranks but Will Not Start' condition, a technician uses a fuel pressure gauge and finds the pressure is within the manufacturer’s specification. However, the engine still fails to start. Which of the following should be checked next?
