Quarterly Practice Quiz Jan 2025

Full-floating piston pins are retained by ________.

• lock rings
• a drilled hole with roll pin
• an interference fit between rod and piston pin
• an interference fit between piston and piston pin

Technician A says that a minor overhaul can often be done with the engine remaining in the vehicle. Technician B says that a core is required for most remanufactured engines. Which technician is correct?

• Technician A

• Technician B

• Both technicians

• Neither technician

Water pumps ________.

• only work at idle and low speeds and are disengaged at higher speeds
• use engine oil as a lubricant and coolant
• are driven by the engine crankshaft or camshaft
• disengage during freezing weather to prevent radiator failure

Which statement is true about thermostats?

• The temperature marked on the thermostat is the temperature at which the thermostat should be fully open.

• Thermostats often cause overheating.

• The temperature marked on the thermostat is the temperature at which the thermostat should start to open

• Both a and b.

The low oil pressure warning light usually comes on ________.

• whenever oil pressure drops dangerously low (4 to 7 psi)
• whenever an oil change is required

• whenever the oil bypass valve opens

• whenever the oil filter anti-drainback valve opens

Which of the following is the least likely to cause an engine noise?

• Carbon on the pistons

• Cracked exhaust manifold

• Loose accessory drive belt

• Vacuum leak

Two technicians are discussing oil leaks. Technician A says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks. Technician B says that a white spray powder can be used to locate oil leaks. Which technician is correct?

• Technician A

• Technician B

• Both technicians

• Neither technicians

Which of these smoke colors indicates excessive fuel being burned in the combustion chamber?

• Blue

• Black

• White

• Gray

Identify the type of ignition system shown in this diagram.

• Waste spark ignition system

• Distributor ignition system

• Capacitor discharge system

• Coil-on-plug ignition system

Which term describes the PCM using oxygen sensor feedback to control fuel delivery?

• Open loop mode

• Closed loop mode

• Starting mode

• Clear flood mode