PICAT EXAM STUDY GUIDE: AUTO AND SHOP

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PICAT EXAM STUDY GUIDE: AUTO AND SHOP

INFORMATION #1 EXAM QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -16 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: Which of these is not a stroke?

power intake compression combustion

Answer:

Answer: combustion

The four strokes in a cycle are intake, compression, power, and exhaust. Note: In some of the older study materials, the power stage is referred to as the combustion stage, but this is no longer used in ASVAB content. The term power has replaced combustion in this cycle description. Be sure to consult the most current study materials when preparing for this test.Question 2: The ____ is the emission-control system that forces unburned or partially-burned fuel back into the cylinder to be burned.

Answer:

Answer: exhaust gas recirculation

Unburned or partially unburned fuel can result from the combustion process and can be harmful to the atmosphere. The EGR forces exhaust gas back into the engine to be burned.

Question 3: The ____ is the part of the electrical system in charge of absorbing excess current.

Answer:

Answer: voltage regulator

The voltage regulator protects the passageways of the high voltage current from breaking down by absorbing the excess current.Question 4: With an automatic transmission, which is the best explanation as to why is there no need for a driver-operated clutch?

Answer:

Answer: There is a torque converter that automatically changes the torque needed.The purpose of the driver-operated clutch is to disconnect the engine from the drive shaft so that the driver can manually change gears or change the torque. A driver-operated clutch would be useless in an automatic car because the torque converter automatically changes gears, as needed.

Question 5: The function of the tachometer is to ____.

Answer:

Answer: measure revolutions per minute

The tachometer measures RPM on the dashboard.Question 6: Joe loves to go on wild nature adventures. He always brings his four-wheel drive truck. In difficult terrain such as deep snow or loose sand, why would Joe's truck do better than a 2-wheel drive SUV?

Answer:

Answer: More driven wheels increase the likelihood of gaining traction.

Four-wheel drive vehicles have power applied to both the front and rear axles.

Question 7: When a driver presses the accelerator, the throttle ____.

Answer:

Answer: opens, which allows more air into the engine

The throttle is mechanically or electronically connected to the accelerator. The more the driver pushes the pedal, the greater the throttle opens, allowing more air to pass through to the engine.

Question 8: A typical car engine has how many strokes per cycle?

Answer:

Answer: 4

A typical engine has 4 strokes per cycle (intake, compression, power, exhaust), which use the pressure created from fuel combustion to run.

Question 9: The purpose of the oil pump is to ____.

Answer:

Answer: provide lubrication and prevent friction between metal parts of the engine Lubrication is important to extend the life of the engine parts and to lower the engine temperature by preventing friction.

Question 10: The primary purpose of emission-control systems is to ____.

Answer:

Answer: reduce emissions

The purpose of an emission-control system is to reduce emissions.

Question 11: What does "EFI" stand for in EFI computer?

Answer:

Answer: Electronic Fuel Injection

The EFI computer controls the amount of fuel being injected into the engine electronically.Question 12: Generally speaking, a framing hammer is different from a mallet or a sledge in that ____.

Answer:

Answer: a framing hammer has a claw to pull out nails

Mallets and sledges do not have claws. Mallets are known for having soft heads, and sledge hammers can be difficult control because of their weight and size.

Question 13: The two types of brakes are ____.

Answer:

Answer: drum and disc

Drums brakes usually are for the rear wheels and disc brakes for the front.Question 14: If a driver inserts the key to start his car and the car does not start, then there is a problem with the ignition system. Seeing that the car has a full tank of gas, the next logical thing to do is ____.

Answer:

Answer: Check the batteries by turning on the lights or radio.

The ignition system needs current from the car battery to crank the engine.

Question 15: Ron had his dad's permission to use his car, even though the predicted weather was frigid and a snowstorm was expected. Ron remembered to check the oil and refill the cooling system with water the night before he left. He also positioned the car near the end of the driveway so he could easily get out if the snow started overnight.The next morning, the car started fine, but steam began to come from under the hood after he had driven for a while. What is the most likely cause of this?

Answer:

Answer: He forgot to add antifreeze, as well as water, to the cooling system.

Antifreeze lowers the freezing point of water to prevent it from freezing during cold weather. If the water in the cooling system freezes (as it might in the weather described), the car will start, but the radiator will overheat when no water can reach it because the water is frozen. Steam from under the hood would be a symptom of this. The car would not have started at all if the battery was dead. Oil issues would not cause steam and any amount of oil would not have been used in a short time. The engine may be old, but steam, by itself, is not an indication of it needing to be replaced.

Question 16: The fastening tool used to turn nuts and bolts is called a ____.

Answer:

Answer: wrench

Wrenches have a jaw where nuts and bolts can fit to be turned or held in place.