2B1 Attempt 2 (Power Engineering) 2025
NEWEST EXAM COMPLETE 150 QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+ BRAND
NEW!!
Question 1
The main chemical groups of fuels are:
Select one:
a. naphthenes
b. ethanol, xylene, and methanol
c. kerosene, diesel, and gasoline
d. crude, oil, shale and reformed spirits
e. paraffins, naphthenes, and aromatics - CORRECT ANSWER: The correct answer is:
paraffins, naphthenes, and aromatics
Question 2
Shocks in a pump discharge line may be reduced by using:
1. automatic controls
2. a relief valve
3. check valves having a built in dashpot
4. anti water hammer valves
5. an air chamber
,Select one:
a. 1, 2, 3
b. 1, 2, 5
c. 1, 3, 5
d. 2, 3, 4
e. 2, 3, 5 - CORRECT ANSWER: The correct answer is: 2, 3, 5
Question 3
The period of time from when fuel is injected to when the ignition of the fuel actually
occurs is referred to as:
Select one:
a. combustion lag
b. post combustion
c. ignition delay
d. pre-ignition
e. knock - CORRECT ANSWER: The correct answer is: ignition delay
Question 4
The ___________ of a fluid is its resistance to flow.
Select one:
a. viscosity
b. thickness
,c. pour point
d. internal pressure
e. external pressure - CORRECT ANSWER: The correct answer is: viscosity
Question 5
High compression gas engines:
Select one:
a. are designed to burn richer mixture fuels
b. induct gas and air mixtures in ideal proportion
c. do not need spark plugs
d. are limited to burning gaseous fuels
e. employ ignition system voltages above 25 000 volts - CORRECT ANSWER: The
correct answer is: employ ignition system voltages above 25 000 volts
Question 6
Magneto ignition systems are advantageous over battery ignition systems in that they:
Select one:
a. do not require a distributor
b. are more suitable for slower engines
c. are easier to set the timing
d. are used in all automobiles
e. produce a hotter spark at higher speeds - CORRECT ANSWER: The correct answer
is: produce a hotter spark at higher speeds
, Question 7
How do some control systems ensure high reliability and equipment protection?
Select one:
a. More operator alarms
b. More control system operators
c. More trained personnel
d. Two out of three voting logic for critical input signals
e. Single hardwired systems - CORRECT ANSWER: The correct answer is: Two out of
three voting logic for critical input signals
Question 8
Steam is expanded through turbine nozzle. From initial pressure to final pressure the
enthalpy drop is 70 kJ. Calculate the velocity of discharge.
Specific volume of steam at the exit equals 1m³/kg. Neglect friction.
** Calculate answer in m/s to 1 decimal place ** - CORRECT ANSWER: The correct
answer is: 374.2
Question 9
Dual fuel engines usually have compression ratios similar to:
Select one:
a. conventional spark ignition engines
b. high compression spark ignition engines
NEWEST EXAM COMPLETE 150 QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+ BRAND
NEW!!
Question 1
The main chemical groups of fuels are:
Select one:
a. naphthenes
b. ethanol, xylene, and methanol
c. kerosene, diesel, and gasoline
d. crude, oil, shale and reformed spirits
e. paraffins, naphthenes, and aromatics - CORRECT ANSWER: The correct answer is:
paraffins, naphthenes, and aromatics
Question 2
Shocks in a pump discharge line may be reduced by using:
1. automatic controls
2. a relief valve
3. check valves having a built in dashpot
4. anti water hammer valves
5. an air chamber
,Select one:
a. 1, 2, 3
b. 1, 2, 5
c. 1, 3, 5
d. 2, 3, 4
e. 2, 3, 5 - CORRECT ANSWER: The correct answer is: 2, 3, 5
Question 3
The period of time from when fuel is injected to when the ignition of the fuel actually
occurs is referred to as:
Select one:
a. combustion lag
b. post combustion
c. ignition delay
d. pre-ignition
e. knock - CORRECT ANSWER: The correct answer is: ignition delay
Question 4
The ___________ of a fluid is its resistance to flow.
Select one:
a. viscosity
b. thickness
,c. pour point
d. internal pressure
e. external pressure - CORRECT ANSWER: The correct answer is: viscosity
Question 5
High compression gas engines:
Select one:
a. are designed to burn richer mixture fuels
b. induct gas and air mixtures in ideal proportion
c. do not need spark plugs
d. are limited to burning gaseous fuels
e. employ ignition system voltages above 25 000 volts - CORRECT ANSWER: The
correct answer is: employ ignition system voltages above 25 000 volts
Question 6
Magneto ignition systems are advantageous over battery ignition systems in that they:
Select one:
a. do not require a distributor
b. are more suitable for slower engines
c. are easier to set the timing
d. are used in all automobiles
e. produce a hotter spark at higher speeds - CORRECT ANSWER: The correct answer
is: produce a hotter spark at higher speeds
, Question 7
How do some control systems ensure high reliability and equipment protection?
Select one:
a. More operator alarms
b. More control system operators
c. More trained personnel
d. Two out of three voting logic for critical input signals
e. Single hardwired systems - CORRECT ANSWER: The correct answer is: Two out of
three voting logic for critical input signals
Question 8
Steam is expanded through turbine nozzle. From initial pressure to final pressure the
enthalpy drop is 70 kJ. Calculate the velocity of discharge.
Specific volume of steam at the exit equals 1m³/kg. Neglect friction.
** Calculate answer in m/s to 1 decimal place ** - CORRECT ANSWER: The correct
answer is: 374.2
Question 9
Dual fuel engines usually have compression ratios similar to:
Select one:
a. conventional spark ignition engines
b. high compression spark ignition engines
