2B1 Attempt 2 (Power Engineering) Questions With Complete Solutions

2B1 Attempt 2 (Power Engineering) Questions With Complete Solutions




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 - (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 - (ANSWER)The correct answer is: 2, 3, 5

,2B1 Attempt 2 (Power Engineering) Questions With Complete Solutions




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 - (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 - (ANSWER)The correct answer is: viscosity



Question 5



High compression gas engines:



Select one:

,2B1 Attempt 2 (Power Engineering) Questions With Complete Solutions




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 - (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 - (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

, 2B1 Attempt 2 (Power Engineering) Questions With Complete Solutions




e. Single hardwired systems - (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 ** - (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

c. conventional oil burning diesel engines

d. supercharged engines

e. naturally aspirated engines - (ANSWER)The correct answer is: conventional oil burning diesel engines



Question 10



With reference to the basic steps for starting a gas turbine, what action may be required when starting
at a low ambient temperature?

Select one: