3B2 Power Engineer Exam Practice Questions With
Complete Solutions
_____ compressors require intake and discharge valves.
Select one:
A. Rotary
B. Centrifugal
C. Sliding vane
D. Rotary lobe
E. Reciprocating Correct Answers E
A _____ is used to activate an inlet air unloader by responding
to receiver pressure.
Select one:
A. Solenoid valve
B. Spring loaded pilot valve
C. Spring
D. Lever
E. Camshaft Correct Answers B
A carbo-blast cleaning consists of__________________.
a. using carbon black to clean the unit
b. removing all the carbon by blasting it off with solvents
c. removing all the dirt by scrubbing the blades with rice
d. removing dirt and carbon with high pressure water
e. removing carbon from the gas passages, blades, and nozzles
Correct Answers C
A condenser shell may be fitted with an expansion joint if the:
Select one:
,A. Expected temperature differentials will be greater than 20°C
B. Condenser tubes are U-shaped
C. Condenser is of welded construction
D. Condenser tubes are expanded into the tube sheets
E. Tube sheets are made of Admiralty brass Correct Answers D
A fuel gas compressor must be used on gas turbines if?
a. The complexity of the gas system reduces the gas pressure to
low
b. The gas supply pressure is less than the compressor last stage
pressure
c. The total pressure drop across the combustors is too great
d. Multiple gas nozzles drops the burner gas pressure too low
e. The combustor outlet pressure is greater the compressor outlet
pressure Correct Answers B
A good method of removing moisture from air before it goes
into the air receiver is to:
Select one:
A. Heat it
B. Pressurize it
C. Cool it
D. Increase its velocity
E. Decrease its velocity Correct Answers C
A magneto ignition system:
Select one:
A. Does not require a coil
B. Produces AC power
C. Produces a hotter spark at high speeds
,D. Does not require points
E. Does not require a condenser Correct Answers C
A method of unloading a reciprocating compressor is to:
Select one:
A. Hold the discharge valve closed
B. Hold the discharge valve open
C. Place a check valve in the discharge line
D. Hold the inlet valves in the open position
E. Unloading a cylinder Correct Answers D
A pressure-velocity compounded turbine may have:
1. Two velocity-compounded stages
2. One velocity-compounded stages
3. Several pressure-compounded stages
4. Pressure and velocity-compounded stages
Select one:
A. 1, 2
B. 3, 4
C. 1, 2, 3
D. 2, 3, 4
E. 1, 2, 3, 4 Correct Answers E
Adjustable inlet diffuser vanes on centrifugal air compressors
are implemented to:
Select one:
A. Change the operating characteristics of the compressor
B. Change the direction of the air flow to remove moisture
C. Remove foreign particles from the air
D. Only reduce the amount of air entering the compressor
E. Prevent back or reverse flow of air Correct Answers A
, Aero-derivative lube oil systems use a scavenge pump to:
a. Recycle oil form the cleaning system
b. Collects oil from all users for recycling
c. Siphons off small amounts of oil for cleaning
d. Collects oil from the supply and return filters for cleaning
e. Returns the oil from the bearings to the supply Correct
Answers E
Air in a surface condenser:
1) Increases the pressure
2) Retards heat transfer
3) Enters with the high pressure ejector steam
4) Is cooled before being removed
a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 4
e. 2, 3 Correct Answers D
Anti-icing systems are used to prevent:
a. Plugging of filters with ice
b. Damage to the duct work from icing
c. Blade damage
d. Too low an intake air temperature
e. Compressor surging Correct Answers C
Anti-icing systems can cause:
Complete Solutions
_____ compressors require intake and discharge valves.
Select one:
A. Rotary
B. Centrifugal
C. Sliding vane
D. Rotary lobe
E. Reciprocating Correct Answers E
A _____ is used to activate an inlet air unloader by responding
to receiver pressure.
Select one:
A. Solenoid valve
B. Spring loaded pilot valve
C. Spring
D. Lever
E. Camshaft Correct Answers B
A carbo-blast cleaning consists of__________________.
a. using carbon black to clean the unit
b. removing all the carbon by blasting it off with solvents
c. removing all the dirt by scrubbing the blades with rice
d. removing dirt and carbon with high pressure water
e. removing carbon from the gas passages, blades, and nozzles
Correct Answers C
A condenser shell may be fitted with an expansion joint if the:
Select one:
,A. Expected temperature differentials will be greater than 20°C
B. Condenser tubes are U-shaped
C. Condenser is of welded construction
D. Condenser tubes are expanded into the tube sheets
E. Tube sheets are made of Admiralty brass Correct Answers D
A fuel gas compressor must be used on gas turbines if?
a. The complexity of the gas system reduces the gas pressure to
low
b. The gas supply pressure is less than the compressor last stage
pressure
c. The total pressure drop across the combustors is too great
d. Multiple gas nozzles drops the burner gas pressure too low
e. The combustor outlet pressure is greater the compressor outlet
pressure Correct Answers B
A good method of removing moisture from air before it goes
into the air receiver is to:
Select one:
A. Heat it
B. Pressurize it
C. Cool it
D. Increase its velocity
E. Decrease its velocity Correct Answers C
A magneto ignition system:
Select one:
A. Does not require a coil
B. Produces AC power
C. Produces a hotter spark at high speeds
,D. Does not require points
E. Does not require a condenser Correct Answers C
A method of unloading a reciprocating compressor is to:
Select one:
A. Hold the discharge valve closed
B. Hold the discharge valve open
C. Place a check valve in the discharge line
D. Hold the inlet valves in the open position
E. Unloading a cylinder Correct Answers D
A pressure-velocity compounded turbine may have:
1. Two velocity-compounded stages
2. One velocity-compounded stages
3. Several pressure-compounded stages
4. Pressure and velocity-compounded stages
Select one:
A. 1, 2
B. 3, 4
C. 1, 2, 3
D. 2, 3, 4
E. 1, 2, 3, 4 Correct Answers E
Adjustable inlet diffuser vanes on centrifugal air compressors
are implemented to:
Select one:
A. Change the operating characteristics of the compressor
B. Change the direction of the air flow to remove moisture
C. Remove foreign particles from the air
D. Only reduce the amount of air entering the compressor
E. Prevent back or reverse flow of air Correct Answers A
, Aero-derivative lube oil systems use a scavenge pump to:
a. Recycle oil form the cleaning system
b. Collects oil from all users for recycling
c. Siphons off small amounts of oil for cleaning
d. Collects oil from the supply and return filters for cleaning
e. Returns the oil from the bearings to the supply Correct
Answers E
Air in a surface condenser:
1) Increases the pressure
2) Retards heat transfer
3) Enters with the high pressure ejector steam
4) Is cooled before being removed
a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 4
e. 2, 3 Correct Answers D
Anti-icing systems are used to prevent:
a. Plugging of filters with ice
b. Damage to the duct work from icing
c. Blade damage
d. Too low an intake air temperature
e. Compressor surging Correct Answers C
Anti-icing systems can cause:
