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Quiz Session - Attempts With Random Questions

ASE A Series Exam Questions

Page 6 of 25

101.

The following EVAP system code is stored in a vehicle: P0442 small leak detected. Technician A says this code could be set due to a defective purge solenoid. Technician B says this code could be set due to a faulty purge line.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

After checking for a large leak, the PCM will check the EVAP system for small leaks. It does this by closing both the vent and purge valves and monitoring the fuel tank pressure sensor. A small leak could have a number of causes, including a loose gas cap, a defective vent or purge solenoid, or vent/purge line problems.

102.

Technician A says the thrust angle is the angle of the rear wheels as determined by the total rear camber. Technician B says on vehicles with an independent rear suspension, if both wheels do not have equal toe, the vehicle will pull to the side with the most toe out.

Who is correct?

  • Neither A nor B

  • Technician A 

  • Technician B

  • Both A and B

Correct answer: Neither A nor B

Both technicians are incorrect. Thrust angle is the angle of the rear wheels as determined by the total rear toe. On vehicles with an independent rear suspension, if the wheels have unequal toe, the vehicle will pull or lead to the side with the most toe in.

103.

A turn signal bulb is being tested with an ohmmeter. The meter reads 0.5 ohms.

What does this mean?

  • The bulb filament is working properly

  • The bulb filament is broken 

  • The bulb filament is shorted 

  • The bulb has high resistance 

Correct answer: The bulb filament is working properly

Most bulbs will have a resistance between 0.5 and 20 ohms at room temperature. A reading of "out of limits" (OL) means the bulb filament is broken, and a reading of 0 ohms means the bulb filament is shorted, although this is rare.

104.

Technician A says a micron vacuum gauge can be useful when performing AC service. Technician B says a temperature and humidity gauge can be helpful during AC performance testing.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. A micron vacuum gauge can be used to measure the amount of air in the system after evacuation. A temperature and humidity gauge can help determine expected AC pressures.

105.

In a parallel circuit with two branches, one with 5 ohms and the other with 5 ohms, what is the total resistance?

  • 2.5 ohms

  • 25 ohms

  • 10 ohms

  • 5 ohms

Correct answer: 2.5 ohms

In a parallel circuit, the product of the two branches' total resistance is divided by the sum of the two branches' resistance. In the example above:

Product: 5 x 5 = 25

Sum: 5 + 5  = 10

Total resistance: 25 / 10 = 2.5 

106.

Technician A says some diesel engines will keep the glow plugs on after the engine is started. Technician B says the PCM monitors ECT and IAT sensor inputs for glow plug control.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. The PCM monitors ECT and IAT sensor signals to determine when to turn on the glow plugs. The PCM will turn the glow plugs on during a cold start and may keep them on to reduce white exhaust smoke and to improve idle quality.

107.

With the connector removed, what should the ECT sensor read on a scan tool?

  • -40 degrees 

  • 285 degrees

  • 100 degrees

  • 0 degrees 

Correct answer: -40 degrees

An ECT sensor reading of -40 degrees corresponds to full signal voltage of around 4.95 volts. This is what the PCM sees when the connector is removed.

If the connector is jumped, it will read about 285 degrees.

108.

The third color band on a four-band resistor represents the:

  • Multiplier 

  • Numbers 

  • Tolerance 

  • Accuracy 

Correct answer: Multiplier

Fixed resistors can be distinguished by the color-coded bands that wrap around their bodies, which can be read on a color code chart. On a four-band resistor:

  • The first two bands represent numbers or significant figures.
  • The third band represents the number of zeros that follow (the multiplier).
  • The fourth band represents the tolerance, or accuracy, of the resistor.

There are also 3-, 5-, and 6-band resistors.

109.

A technician notes that the fuel pressure of a vehicle drops off with the key on and the engine off. Fuel pressure is normal when the key is off.

Which of the following is the MOST likely cause?

  • A faulty fuel pump check valve

  • A clogged fuel filter

  • A poor fuel pump ground

  • A restricted return line

Correct answer: A faulty fuel pump check valve

The fuel pump check valve is designed to allow fuel to flow in only one direction to maintain pressure. One of the main symptoms of a faulty fuel pump check valve is fuel pressure that drops off with the key on and the engine off.

A clogged fuel filter and a poor fuel pump ground can cause low pressure at all times. On the other hand, the restricted return line is going to lead to higher than normal pressures. 

110.

All of the following are components of a planetary gear set except:

  • Valve body 

  • Sun gear

  • Pinion gears

  • Ring gear

Correct answer: Valve body

The valve body is used to direct fluid flow in an automatic transmission. It is not part of the planetary gear set. A simple planetary gear set contains three main components: sun gear, planetary or pinion gears and carrier, and ring gear.

111.

Technician A says that generally, the MAF sensor should exceed 100 grams per second at WOT. Technician B says that generally, the MAF sensor should exceed 7 kHz at WOT.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. These are two different methods for testing a MAF sensor for proper operation. Generally, at WOT (wide open throttle) the MAF sensor should exceed 100 grams per second, as interpreted and reported by the scan tool, and it should also exceed 7 kHz at WOT. If the readings are below these, the sensor is likely contaminated.

Another indication of contamination include readings below 4 volts on an analog sensor with a digital voltmeter. 

112.

Typically, the driveshaft rotates at what speed?

  • Three times faster than the wheels

  • At the same speed as the wheels 

  • At half the speed of the wheels 

  • At twice the speed of the wheels

Correct answer: Three times faster than the wheels

Because gear reduction occurs in the axle, the driveshaft rotates faster than the wheels. Just how much faster depends on the gear ratio. 

113.

Technician A says tire pressure increases by 1 PSI with every 10-degree increase in temperature. Technician B says fuel economy is reduced by 0.1 mpg for every 1 PSI the tires are low.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. As the temperature of a tire increases, the pressure also increases. Tire pressure increases by 1 PSI with every 10-degree increase in temperature. In addition, if all four tires are underinflated, fuel economy is reduced by 0.1 mpg for every 1 PSI the tires are low.  

114.

Considering a standard production four-stroke engine, how often does the power stroke occur on an 8-cylinder engine?

  • Every 1/4 rotation (90°)

  • Every 1/2 rotation (180°)

  • Every 1/8 rotation (45°)

  • Every 1/16 rotation (22.5°)

Correct answer: Every 1/4 rotation

The number of degrees that the crankshaft rotates between power strokes is expressed as an angle. Each cycle in a four-stroke engine requires two rotations of the crankshaft, or 720 degrees of rotation (360° x 2). To find the answer to this question, divide two rotations (720°) by the number of cylinders. For our V8 engine, 720° / 8 = 90°, or every 1/4 rotation.

115.

Two technicians are diagnosing difficulty shifting a manual transmission. Technician A says excessive main shaft end play can cause this problem. Technician B says a clutch not fully disengaging can cause this problem.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. Excessive main shaft end play can cause the gears to move away from the synchronizer assembly. Because the synchronizer can't fully seat, gear speeds won't match up. If the clutch doesn't fully disengage, engine torque will still be transmitted to the input shaft. Depending on the severity, either condition can make shifting difficult or impossible.

116.

Two technicians are discussing hydraulic valve lifters. Technician A says some lifters must be bled prior to installation. Technician B says some lifters can be bled by operating the engine at fast idle.

Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. Some lifters can be bled by running the engine at fast idle, but others must be bled prior to installation. Bench bleeding hydraulic lifters is accomplished by putting the lifter in a container of oil and using a tool to depress the oil passage check ball. Check the repair manual for procedures specific to the engine.

117.

All of the following are true regarding TCC operation except:

  • Slow TCC engagement is usually caused by an open solenoid circuit 

  • TCC failure can lead to transmission overheating 

  • There should be a drop of about 150 to 250 rpm during TCC disengagement

  • Transmission fluid temperature that is too low can prevent TCC lockup

Correct answer: Slow TCC engagement is usually caused by an open solenoid circuit

Slow torque converter clutch (TCC) engagement is usually caused by worn clutches. If the TCC solenoid circuit were open, the TCC would not function at all.

All the other options are true:

  • TCC failure can lead to transmission overheating
  • There should be a drop of about 150 to 250 rpm during TCC disengagement
  • Transmission fluid temperature that is too low can prevent TCC lockup

118.

After a new engine is installed, how soon should the engine oil be changed?

  • 500 miles

  • 100 miles

  • 200 miles

  • 1,000 miles

Correct answer: 500 miles

After a new engine is installed, the oil should be changed within 500 miles or 20 hours of operation.

119.

Which valve connects to the shift lever in the transmission?

  • Manual valve

  • Switching valve

  • Pressure control valve

  • One-way check valve

Correct answer: Manual valve

The manual valve, controlled manually by the driver, is the main flow-directing valve in an automatic transmission. The valve connects to the shift lever in the transmission, and the driver controls the valve through the gear selector and linkage. In this way, the manual valve distributes pressure to the hydraulic circuits uncovered by the valve lands.

120.

Two technicians are discussing swapping tires left to right to correct a pulling condition. Technician A says this may correct pulling due to ply steer. Technician B says this may correct pulling due to tire conicity.

Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. Ply steer and conicity describe how inconsistencies in tire construction can induce pulling or drifting. Ply steer is caused by the angle of the cords in the belt layers, causing the vehicle to drift. Ply steer usually cannot be addressed by swapping the tires from left to right. Conicity refers to the tendency of the tire to roll left or right, causing the vehicle to pull. Switching the tires from left to right can often remedy pulling due to tire conicity.

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