Power Engineering - 4B7 UPDATED ACTUAL Questions and CORRECT
Answers
Question: Which of the following comes earliest in the start-up sequence of a steam turbine? a. Manually
test the overspeed trip. b. Open the steam inlet valve slightly to start the turbine rolling. c. Reset the
overspeed trip. d. Close the casing drain valve and ensure the casing drain steam trap remains in service.
Correct Answer: c. Reset the overspeed trip.
Question: A routine inspection of an operating steam engine should start with
Correct Answer: a. checking the load on the engine. b. checking the boiler pressure. c. blowing off the
steam chest drains. d. making sure the lubricators are feeding properly.: d. making sure the lubricators are
feeding properly.
Question: The turbine overspeed trip
Correct Answer: a. Alerts the operator of excessive turbine RPM b. Opens the sentinel valve c. Adjusts
steam flow to keep the speed at set point d. Prevents the turbine from exceeding the maximum rated speed:
d. Prevents the turbine from exceeding the maximum rated speed
Question: A starting device for a gas turbine a. is also called "barring gear" b. keeps rotating the turbine
shaft until the turbine is up to full load c. must be an electric motor d. is necessary for all gas turbines
Correct Answer: d. is necessary for all gas turbines
Question: In theory, impulse turbines
Correct Answer: a. Develop the most torque of all turbines b. Can only use only low-pressure steam c.
Have no pressure drop through the moving blades d. Have a velocity drop through the nozzle: c. Have no
pressure drop through the moving blades
Question: Which of the following is a prime mover ? a. An electric generator b. A gas turbine c. An air
compressor d. A boiler
Correct Answer: b. A gas turbine
Question: A simple gas turbine is one without reheaters or
Correct Answer: a. Regenerators b. Combustors c. Compressors d. Starting motors: a. Regenerators
Question: Steam turbine governors
Correct Answer: a. Are not required on reaction turbines b. Should be checked annually by the boiler
inspector c. regulate the speed of the turbine automatically d. prevent the turbine from over speeding: c.
regulate the speed of the turbine automatically
Question: The injection pump of a diesel engine is driven by
Correct Answer: a. A camshaft b. The governor c. The gudgeon pin d. Piston action: a. A camshaft
Question: Some of the characteristics that make the gas turbine a better choice over other prime movers are
Correct Answer: a. Increased power output at higher elevations b. its low fuel consumption c. its ability to
rapidly start and carry full load d. its high thermal efficiency e. its low power-to-weight ratio: c. its ability to
rapidly start and carry full load
Question: Diesel engine governing is accomplished by
,Correct Answer: a. modulating the pressure of the atomizing air. b. varying the amount of fuel injected on
each power stroke c. varying the amount of air-fuel mixture drawn into the engine when the load changes d.
varying the load on the engine: b. varying the amount of fuel injected on each power stroke
Question: Excessive wind velocity in a natural draft cooling tower may cause
Correct Answer: a. Over-cooling of the water b. Unstable sump water level c. High drift losses d.
Damaged louvres: c. High drift losses
Question: The output power of a gas turbine depends upon a. the difference between inlet air and turbine
exhaust temperature b. the drive gear ratio between the turbine and compressor c. the temperature at the
turbine inlet in Kelvin d. the mass of hot gas passing through the turbine per unit time
Correct Answer: d. the mass of hot gas passing through the turbine per unit time
Question: When _____________ leached away from cooling tower wood, it is less able to resist decay. a.
natural extractives are b. cellulose is c. lignin is d. sap is
Correct Answer: a. natural extractives are
Question: Large internal combustion engines are cooled with
Correct Answer: a. Condensers b. Air cooling fins on the cylinder jackets c. Large fans d. Water jackets: d.
Water jackets
Question: A major difficulty encountered with a two-stroke cycle engine is
Correct Answer: a. The lack of torque at high speed b. The difficulty in cold weather starting c. The high
speeds compared to an equivalent four-stroke engine d. Exhausting the spent gases from the cylinder: d.
Exhausting the spent gases from the cylinder
Question: Biological attack on cooling tower wood affects the a. chemicals that cement the cellulose fibres
together. b. natural extractives. c. lignin. d. cellulose.
Correct Answer: d. cellulose.
Question: An essential auxiliary in a gas turbine installation is
Correct Answer: a. a starting motor b. a water injection system c. a generator d. an air heater: a. a starting
motor
Question: In a reaction turbine the steam ____________ when passing through moving blades. a. Velocity
decreases b. Velocity remains constant c. Pressure decreases d. Pressure increases
Correct Answer: c. Pressure decreases
Question: A two shaft gas turbine
Correct Answer: a. is always regenerative b. uses two shafts, geared together c. is always an open cycle d.
has the load turbine downstream from the compressor turbine: d. has the load turbine downstream from the
compressor turbine
Question: The slide valve of a steam engine is designed to
Correct Answer: a. Allow steam to enter and leave the cylinder b. Prevent the engine from over-speeding
c. Provide lubrication for the steam engine d. Drain the condensate from the cylinder during warm-up: a.
Allow steam to enter and leave the cylinder
Question: Cylinder scavenging
, Correct Answer: a. Is performed by a special piston ring that removes excessive oil from the cylinder
walls b. May be aided with air injectors to rapidly fill the cylinder c. Refers to the removal of exhaust gases
from the cylinder d. Refers to the flow of fuel air mixture into a diesel engine.: c. Refers to the removal of
exhaust gases from the cylinder
Question: The rotating passages of a reaction turbine are mounted on the
Correct Answer: a. Diaphragm b. Casing c. Shroud ring d. Rotor: d. Rotor
Question: A steam engine piston
Correct Answer: a. Moves fastest from the start to the mid point of its stroke b. Is lubricated inside the
crankcase by the splash method c. Produces the most force at the end of its stroke d. Moves fastest at the
end of its stroke: a. Moves fastest from the start to the mid point of its stroke
Question: Despite their size and complexity, steam plants are widely used because
Correct Answer: a. they are relatively inexpensive to build b. they do not require trained operators c. they
require little maintenance or repairs d. they can use a wide variety of heat sources, including hydrocarbon
fuels, waste heat, solar energy and nuclear energy.: d. they can use a wide variety of heat sources, including
hydrocarbon fuels, waste heat, solar energy and nuclear energy.
Question: The impulse turbine works on the principle that
Correct Answer: a. High velocity steam exerts force upon the rotating blades due to change in momentum.
b. The high pressure creates unbalanced forces on the blades c. Steam expansion in the moving blades
creates a force impulse d. Kinetic energy can be converted to mechanical energy: a. High velocity steam
exerts force upon the rotating blades due to change in momentum.
Question: A closed cycle gas turbine
Correct Answer: a. Burns fuel with spent exhaust gas. b. Recycles the same working fluid c. Is the most
common type of gas turbine d. Does not need a combustion chamber: b. Recycles the same working fluid
Question: When the steam pressure drop occurs only in the stationary steam passages, the turbine is known
as
Correct Answer: a. A single stage turbine b. A Parsons turbine c. A reaction turbine d. An impulse turbine:
d. An impulse turbine
Question: The shafts of high output, high temperature steam turbines are usually sealed using
Correct Answer: a. Labyrinth glands b. Packing rings c. Carbon rings d. Garter springs: a. Labyrinth
glands
Question: A reduction in sealing between the piston rings and the cylinder wall may be the result of
Correct Answer: a. High carbon residue in the oil b. High coolant temperature c. Low cooling water
temperature d. High oil viscosity: b. High coolant temperature
Question: A gas turbine
Correct Answer: a. Output increases when equipped with an air preheater b. Operates the best when the
inlet air is hot c. Output increases when using air of maximum density d. Expands hot gases through the
compressor: c. Output increases when using air of maximum density
Question: When starting a steam turbine it is customary practice to
Answers
Question: Which of the following comes earliest in the start-up sequence of a steam turbine? a. Manually
test the overspeed trip. b. Open the steam inlet valve slightly to start the turbine rolling. c. Reset the
overspeed trip. d. Close the casing drain valve and ensure the casing drain steam trap remains in service.
Correct Answer: c. Reset the overspeed trip.
Question: A routine inspection of an operating steam engine should start with
Correct Answer: a. checking the load on the engine. b. checking the boiler pressure. c. blowing off the
steam chest drains. d. making sure the lubricators are feeding properly.: d. making sure the lubricators are
feeding properly.
Question: The turbine overspeed trip
Correct Answer: a. Alerts the operator of excessive turbine RPM b. Opens the sentinel valve c. Adjusts
steam flow to keep the speed at set point d. Prevents the turbine from exceeding the maximum rated speed:
d. Prevents the turbine from exceeding the maximum rated speed
Question: A starting device for a gas turbine a. is also called "barring gear" b. keeps rotating the turbine
shaft until the turbine is up to full load c. must be an electric motor d. is necessary for all gas turbines
Correct Answer: d. is necessary for all gas turbines
Question: In theory, impulse turbines
Correct Answer: a. Develop the most torque of all turbines b. Can only use only low-pressure steam c.
Have no pressure drop through the moving blades d. Have a velocity drop through the nozzle: c. Have no
pressure drop through the moving blades
Question: Which of the following is a prime mover ? a. An electric generator b. A gas turbine c. An air
compressor d. A boiler
Correct Answer: b. A gas turbine
Question: A simple gas turbine is one without reheaters or
Correct Answer: a. Regenerators b. Combustors c. Compressors d. Starting motors: a. Regenerators
Question: Steam turbine governors
Correct Answer: a. Are not required on reaction turbines b. Should be checked annually by the boiler
inspector c. regulate the speed of the turbine automatically d. prevent the turbine from over speeding: c.
regulate the speed of the turbine automatically
Question: The injection pump of a diesel engine is driven by
Correct Answer: a. A camshaft b. The governor c. The gudgeon pin d. Piston action: a. A camshaft
Question: Some of the characteristics that make the gas turbine a better choice over other prime movers are
Correct Answer: a. Increased power output at higher elevations b. its low fuel consumption c. its ability to
rapidly start and carry full load d. its high thermal efficiency e. its low power-to-weight ratio: c. its ability to
rapidly start and carry full load
Question: Diesel engine governing is accomplished by
,Correct Answer: a. modulating the pressure of the atomizing air. b. varying the amount of fuel injected on
each power stroke c. varying the amount of air-fuel mixture drawn into the engine when the load changes d.
varying the load on the engine: b. varying the amount of fuel injected on each power stroke
Question: Excessive wind velocity in a natural draft cooling tower may cause
Correct Answer: a. Over-cooling of the water b. Unstable sump water level c. High drift losses d.
Damaged louvres: c. High drift losses
Question: The output power of a gas turbine depends upon a. the difference between inlet air and turbine
exhaust temperature b. the drive gear ratio between the turbine and compressor c. the temperature at the
turbine inlet in Kelvin d. the mass of hot gas passing through the turbine per unit time
Correct Answer: d. the mass of hot gas passing through the turbine per unit time
Question: When _____________ leached away from cooling tower wood, it is less able to resist decay. a.
natural extractives are b. cellulose is c. lignin is d. sap is
Correct Answer: a. natural extractives are
Question: Large internal combustion engines are cooled with
Correct Answer: a. Condensers b. Air cooling fins on the cylinder jackets c. Large fans d. Water jackets: d.
Water jackets
Question: A major difficulty encountered with a two-stroke cycle engine is
Correct Answer: a. The lack of torque at high speed b. The difficulty in cold weather starting c. The high
speeds compared to an equivalent four-stroke engine d. Exhausting the spent gases from the cylinder: d.
Exhausting the spent gases from the cylinder
Question: Biological attack on cooling tower wood affects the a. chemicals that cement the cellulose fibres
together. b. natural extractives. c. lignin. d. cellulose.
Correct Answer: d. cellulose.
Question: An essential auxiliary in a gas turbine installation is
Correct Answer: a. a starting motor b. a water injection system c. a generator d. an air heater: a. a starting
motor
Question: In a reaction turbine the steam ____________ when passing through moving blades. a. Velocity
decreases b. Velocity remains constant c. Pressure decreases d. Pressure increases
Correct Answer: c. Pressure decreases
Question: A two shaft gas turbine
Correct Answer: a. is always regenerative b. uses two shafts, geared together c. is always an open cycle d.
has the load turbine downstream from the compressor turbine: d. has the load turbine downstream from the
compressor turbine
Question: The slide valve of a steam engine is designed to
Correct Answer: a. Allow steam to enter and leave the cylinder b. Prevent the engine from over-speeding
c. Provide lubrication for the steam engine d. Drain the condensate from the cylinder during warm-up: a.
Allow steam to enter and leave the cylinder
Question: Cylinder scavenging
, Correct Answer: a. Is performed by a special piston ring that removes excessive oil from the cylinder
walls b. May be aided with air injectors to rapidly fill the cylinder c. Refers to the removal of exhaust gases
from the cylinder d. Refers to the flow of fuel air mixture into a diesel engine.: c. Refers to the removal of
exhaust gases from the cylinder
Question: The rotating passages of a reaction turbine are mounted on the
Correct Answer: a. Diaphragm b. Casing c. Shroud ring d. Rotor: d. Rotor
Question: A steam engine piston
Correct Answer: a. Moves fastest from the start to the mid point of its stroke b. Is lubricated inside the
crankcase by the splash method c. Produces the most force at the end of its stroke d. Moves fastest at the
end of its stroke: a. Moves fastest from the start to the mid point of its stroke
Question: Despite their size and complexity, steam plants are widely used because
Correct Answer: a. they are relatively inexpensive to build b. they do not require trained operators c. they
require little maintenance or repairs d. they can use a wide variety of heat sources, including hydrocarbon
fuels, waste heat, solar energy and nuclear energy.: d. they can use a wide variety of heat sources, including
hydrocarbon fuels, waste heat, solar energy and nuclear energy.
Question: The impulse turbine works on the principle that
Correct Answer: a. High velocity steam exerts force upon the rotating blades due to change in momentum.
b. The high pressure creates unbalanced forces on the blades c. Steam expansion in the moving blades
creates a force impulse d. Kinetic energy can be converted to mechanical energy: a. High velocity steam
exerts force upon the rotating blades due to change in momentum.
Question: A closed cycle gas turbine
Correct Answer: a. Burns fuel with spent exhaust gas. b. Recycles the same working fluid c. Is the most
common type of gas turbine d. Does not need a combustion chamber: b. Recycles the same working fluid
Question: When the steam pressure drop occurs only in the stationary steam passages, the turbine is known
as
Correct Answer: a. A single stage turbine b. A Parsons turbine c. A reaction turbine d. An impulse turbine:
d. An impulse turbine
Question: The shafts of high output, high temperature steam turbines are usually sealed using
Correct Answer: a. Labyrinth glands b. Packing rings c. Carbon rings d. Garter springs: a. Labyrinth
glands
Question: A reduction in sealing between the piston rings and the cylinder wall may be the result of
Correct Answer: a. High carbon residue in the oil b. High coolant temperature c. Low cooling water
temperature d. High oil viscosity: b. High coolant temperature
Question: A gas turbine
Correct Answer: a. Output increases when equipped with an air preheater b. Operates the best when the
inlet air is hot c. Output increases when using air of maximum density d. Expands hot gases through the
compressor: c. Output increases when using air of maximum density
Question: When starting a steam turbine it is customary practice to
