Archive for April 2020

Ignition of the fuel in a diesel engine is achieved by means of:

Ignition of the fuel in a diesel engine is achieved by means of:


a) A precisely timed glow plug
b) The injector delivery valve pressure
c) The heat of compression
d) The fuel injector nozzle
e) A spark plug


Answer: c

Diesel engines require:

Diesel engines require:


a) A spark plug in each cylinder
b) A carburetor
c) A Magneto
d) A fuel injector
e) An ignition distributor


Answer: d

Four cycle engine lubrication is usually:

Four cycle engine lubrication is usually:




a) Forced by pump
b) By gravity oilers
c) By the scoop method
d) By the dip tube method
e) By grease fitting


Answer: a

Diesel engine governing is accomplished by:

Diesel engine governing is accomplished by:




a) Varying the fuel quality
b) Carburetion
c) Varying the fuel quantity
d) Fuel atomizing air quantity
e) Fuel atomizing air pressure


Answer: c

In a compression ignition engine the fuel is ignited by:

In a compression ignition engine the fuel is ignited by:


a) An electric spark
b) The compressed air temperature
c) the atomized fuel
d) a cross-combustor
e) compressed air pressure


Answer: b

The ______ Stroke: As the piston rises again in the cylinder the remaining exhaust gases are forced out through the open exhaust valve. Just before the piston reaches TDC the inlet valve is opened and the whole cycle is repeated.

The ______ Stroke: As the piston rises again in the cylinder the remaining exhaust gases are forced out through the open exhaust valve. Just before the piston reaches TDC the inlet valve is opened and the whole cycle is repeated.


a) Suction
b) Compression
c) Power
d) Exhaust


Answer: d

The ______ Stroke: hot gasses of combustion expand and force the piston down. Before it reached BDC the burning gases have expended their energy and the exhaust valve is opened to allow them to escape the cylinder.

The ______ Stroke: hot gasses of combustion expand and force the piston down. Before it reached BDC the burning gases have expended their energy and the exhaust valve is opened to allow them to escape the cylinder.


a) Suction
b) Compression
c) Power
d) Exhaust


Answer: c

The ______ Stroke: After the piston has passed BDC the air inlet valve is closed and compression begins as the piston rises. Shortly before TDC fuel injection begins. Under the high temp & pressure conditions the fuel will ignite almost as soon as it enters the cylinders & combines with the hot air.

The ______ Stroke: After the piston has passed BDC the air inlet valve is closed and compression begins as the piston rises. Shortly before TDC fuel injection begins. Under the high temp & pressure conditions the fuel will ignite almost as soon as it enters the cylinders & combines with the hot air.


a) Suction
b) Compression
c) Power
d) Exhaust


Answer: b

The _______ Stroke: The inlet valve is opened just before the piston reached TDC & the exhaust valve closes just after the piston reaches TDC. This action draws a charge of air into the cylinder as the piston descends.

The _______ Stroke: The inlet valve is opened just before the piston reached TDC & the exhaust valve closes just after the piston reaches TDC. This action draws a charge of air into the cylinder as the piston descends.


a) Suction
b) Compression
c) Power
d) Exhaust


Answer: a

Ignition of this fuel is achieved by spark. This fuel is in liquid form and is vaporized by being drawn through fine jets by powerful suction created by the engine on during the intake stroke.

Ignition of this fuel is achieved by spark. This fuel is in liquid form and is vaporized by being drawn through fine jets by powerful suction created by the engine on during the intake stroke.


a) Gasoline
b) Light Oil Fuels
c) Natural Gas
d) Propane
e) Heavy Oil Fuels


Answer: a

_________ is a liquid, primarily consisting of hydrocarbons, but enhanced with benzene or iso-octanes to increase the octane rating, a measure of this fuels resistance to premature detonation which causes engine knock.

_________ is a liquid, primarily consisting of hydrocarbons, but enhanced with benzene or iso-octanes to increase the octane rating, a measure of this fuels resistance to premature detonation which causes engine knock.


a) Gasoline
b) Light Oil Fuels
c) Natural Gas
d) Propane
e) Heavy Oil Fuels


Answer: a

Larger, higher output machines us a shaft seal with many complex winding restrictions to the steam flow by fitting rings into the casing and shaft that form narrow passages for the steam to pass through. These are called _________________.

Larger, higher output machines us a shaft seal with many complex winding restrictions to the steam flow by fitting rings into the casing and shaft that form narrow passages for the steam to pass through. These are called _________________.



Answer: Labyrinth Glands

Which of the following are important functions served by the condenser:

Which of the following are important functions served by the condenser:



a) During condensing a vacuum is produced = pressure INCREASE resulting in more useful work and greater generation efficiency.
b) During condensing a vacuum is produced = pressure DROP resulting in more useful work and greater generation efficiency.
c) Cools the water
d)Provides a pure source of boiler feed water.


Answer: bd

Place the overall boiler-turbine cycle in the correct order:

Place the overall boiler-turbine cycle in the correct order:


a) It them flows through the turbine & develops power to drive an electric generator.
b) This pump raises the pressure above the boiler pressure to push the water back into the boiler to repeat the cycle.
c) The condensate is removed from the condenser by a pump that discharges to the boiler feed water heater and then into the boiler feed pump.
d) Steam is generated in the boiler @ high pressure & super heated.
e) Steam is exhausted from the turbine into the condenser which cools the steam turning it back into water.


Answer: daecb

What is the purpose of the garter springs on the carbon packing rings?

What is the purpose of the garter springs on the carbon packing rings?


a) Hold Packing in place axially
b) Permit slight radial movement for concentric alignment
c) Hold the packing rings together when they break
d) None of these are correct


Answer: ab

The thrust bearing controls axial movement in the shaft by using oil Pressure in the journal bearing creating an oil wedge between the faces & thrust runner. This keeps turbine shaft in correct longitudinal position.

The thrust bearing controls axial movement in the shaft by using oil Pressure in the journal bearing creating an oil wedge between the faces & thrust runner. This keeps turbine shaft in correct longitudinal position.


True or False


Answer: True

In what ways is sticking prevented in the governor?

In what ways is sticking prevented in the governor?




a) High sensitivity - constant motion prevents sticking
b) Lubrication
c) Spaces in the joints
d) Sticking is a non issue


Answer: a

Put the following steps of over-speed trip on a turbine in order:

Put the following steps of over-speed trip on a turbine in order:


a) Motor speed reduces & centrifugal force is not enough to hold the plunger out against the spring.
b) Overspend trip linkage must be reset, which has to be done externally.
c) Tripping speed is reached & the trip plunger is flung out by centrifugal force/shaft rotation & strikes the spring loaded trip lever.


Answer: cab

What is the normal tripping speed on a turbine?

What is the normal tripping speed on a turbine?


a) 5-10% Over the Rated Speed
b) 7-10% Over the Rated Speed
c) 10-15% Over the Rated Speed
d) 15-20% Over the Rated Speed


Answer: c

What is the primary purpose of the placement of glands in a turbine?

What is the primary purpose of the placement of glands in a turbine?


a) To contain oil from the wheel case along the shaft
b) To make the glands accessible during service
c) Insignificant steam leakage from the wheel case along the shaft
d) To block particulate from the wheel case along the shaft


Answer: c

How are bearing lubricated?

How are bearing lubricated?


a) Splash Method
b) Bearings don't need lubrication
c) A nozzle squirts on them
d) Oil rings rotated by the shaft to bring oil from the sump


Answer: d

Space between blades not allow any steam pressure to drop as it passes through. All of the thrust from the steam on the blades comes from the change in momentum of the steam as it changes direction to follow the shape of the blades. This is a description of:

Space between blades not allow any steam pressure to drop as it passes through. All of the thrust from the steam on the blades comes from the change in momentum of the steam as it changes direction to follow the shape of the blades. This is a description of:


a) Reaction Turbine
b) Impulse Turbine


Answer: b

The nozzle rotates expelling steam over stationary blades, these then use the steam pressure & change in direction of the steam to create a force on a rotating set of blades. This turbine sees very little drop in pressure and therefore is very efficient. This is a description of:

The nozzle rotates expelling steam over stationary blades, these then use the steam pressure & change in direction of the steam to create a force on a rotating set of blades. This turbine sees very little drop in pressure and therefore is very efficient. This is a description of:


a) Stationary Passages on an Reaction Turbine
b) Stationary Passages on an Impulse Turbine


Answer: a

Stationary nozzles direct steam against rotating blades. It uses the steam pressure & blade shape to propel the blades. Has moving buckets but a fixed nozzle. As speed of the turbine increases, pressure decreases. Blade speed is directly affected by pressure. This is a description of:

Stationary nozzles direct steam against rotating blades. It uses the steam pressure & blade shape to propel the blades. Has moving buckets but a fixed nozzle. As speed of the turbine increases, pressure decreases. Blade speed is directly affected by pressure. This is a description of:


a) Stationary Passages on an Reaction Turbine
b) Stationary Passages on an Impulse Turbine


Answer: b

The main difference between an IMPULSE & REACTION turbine is the way steam is expanded through the turbine stages. When the steam pressure drops in passing through moving blades & stationary nozzles or blades.

The main difference between an IMPULSE & REACTION turbine is the way steam is expanded through the turbine stages. When the steam pressure drops in passing through moving blades & stationary nozzles or blades.


a) Impulse Turbine
b) Reaction Turbine


Answer: b

The main difference between an IMPULSE & REACTION turbine is the way steam is expanded through the turbine stages. When the entire steam pressure drop takes place in the stationary nozzles it is describing a:

The main difference between an IMPULSE & REACTION turbine is the way steam is expanded through the turbine stages. When the entire steam pressure drop takes place in the stationary nozzles it is describing a:


a) Impulse Turbine
b) Reaction Turbine


Answer: a

Which are advantages of a steam turbine over a steam engine or diesel engine

Which are advantages of a steam turbine over a steam engine or diesel engine


a) Reliable operation
b) Start-up times
c) Simple design
d) Low maintenance cost
e) Number of Components
f)Use in peak power plants
g) No cylinder lubrication
h) Less space required
i) Lighter Foundations Required
j) Reduced vibration


Answer: acdghij
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