Chapter 1 - ASE

Question 1

Typical compression ratios used in diesel engines range between…

Answer 1

X

Question 2

Technician A says thay when compared to a diesel, a gasoline engine delivers usable torque through a much wider RPM range.

Technician B says gasoline engines also run auieter and offer faster acceleration. Who is correct?

Answer 2

X

Question 3

Technician A says unit fuel injectors are being used on diesel engines because they are capable of attaining higher injection pressures than inline pump fuel injection systems.

Technician B says thay inline injection pumps sre capable of sttaining higher injection pressures than unit fuel injectors.

Who is correct?

Answer 3

X

Question 4

Technician A says that electronically controlled fuel injection systems have improved the efficiency of diesel engines.

Technician B says that the most common fuel system found on modern diesel engines is the high-pressure common rail fuel injection system.

Who is correct?

Answer 4

X

Question 5

Technician A states that both 4 stroke and two stroke diesel engines are used for highpowered diesel engines.

Technician B states that only 4 stroke engines are used for high horsepowered diesels.

Who is correct?

Answer 5

X

Question 6

All of the following are characteristics of diesel engines, EXCEPT:

(a) they are more durable than gasoline engines
(b) diesel engines operate at lower compression ratios than gasoline engines
(c) all diesel engines are fuel injected
(d) diesel engines convert higher percentage of fuel into useful power

Answer 6

X

Question 7

All of the following are drawbacks to the diesel engine EXCEPT:

(a) does not produce usable torque through a wide RPM range
(b) power output can be affected by the temperature of the diesel fuel
(c) they offer faster acceleration than gasoline engines
(d) they are more expensive to build

Answer 7

X

Question 8

Technician A states that solidified wax can lead to fuel starvation or a no start situation.

Technician B states that high temperatures can thin out diesel fuel and increase wear.

Who is correct?

Answer 8

X

Question 9

All of the following are changes or systems designed in the last 10 years to improve the efficiency of diesel engines EXCEPT:

(a) inline fuel injection pumps
(b) computer controlled fuel management systems
(c) high efficiency charge air coolers
(d) redesigned intake and exhaust valves

Answer 9

X

Question 10

Stationary applications for diesel engines include:

(a) motorized pumps
(b) starting units
(c) industrial power takeoff units
(d) all of the above

Answer 10

X