CMPR 6007_Gas Compression - Compressor Components 2 page

Question 2:

The disc valve basic part labeled "A" in the diagram is called the:

A - Valve seat
B - Lower valve body
C - Stop plate
D - Upper valve body

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 3:

Compressor crankshafts may be made with counterweights, which serve to:

A - Attach the piston directly to the crankshaft
B - Reduce the thrust load on the crankshaft bearings
C - Convert the reciprocating motion of the crankshaft to rotary motion for the pistons
D - Balance the reciprocating and rotating forces

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 4:

The pressure rating of a compressor cylinder is determined by the:

A - Number of integral cast fins which provide increased radiating area
B - Wall thickness and material of the inner bore
C - Distance from the outer head to the crankcase
D - Type of cooling system used

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 5:

The disc valve basic part labeled "B" in the diagram is called the:

A - Poppets
B - Valve spring
C - Valve channels
D - Valve disc

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 6:

In the two-stage compressor shown here, on the down stroke of the left piston, the _____________closes, and the pressure above the piston and the suction valve discs drops below the suction (crankcase) pressure, causing the _______________ to lift open and allows vapour to pass into the cylinder above the piston.

A - intake valve; left cylinder
B - suction port; discharge valve
C - discharge valve; suction valves
D - right cylinder; suction valves

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 7:

In a double-acting compressor, the purpose of the crosshead is to:

A - Direct the flow of gas across the head of the compressor
B - Attach the piston directly to the crankshaft
C - Join the connecting rod to the piston rod
D - Attach the crankshaft to the connecting rod

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 8:

In the disc type compressor valve, the gas enters through the:

A - Port plate
B - Stop plate
C - Ribbed upper body
D - Ribbed lower body

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 9:

The disc valve basic part labeled "C" in the diagram is called the:

A - Valve springs
B - Valve channels
C - Valve seat
D - Valve guides

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 10:

The reciprocating compressor running gear component that has a threaded hole in one end into which the piston rod fits is called the:

A - Connection rod
B - Cylinder
C - Crosshead
D - Crankshaft

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

Question 1:

In high-pressure ratio and high differential pressure compression applications, which valve type is most commonly used?

A - Plate or disc type
B - Strip type
C - Poppet type
D - None of the above

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 2:

The pressure rating of a compressor cylinder is determined by the:

A - Type of cooling system used
B - Wall thickness and material of the inner bore
C - Number of integral cast fins which provide increased radiating area
D - Distance from the outer head to the crankcase

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 3:

In a double-acting compressor, the purpose of the crosshead is to:

A - Attach the crankshaft to the connecting rod
B - Attach the piston directly to the crankshaft
C - Join the connecting rod to the piston rod
D - Direct the flow of gas across the head of the compressor

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 4:

The reciprocating compressor running gear component that is supported by the main bearings is called the:

A - Crosshead
B - Frame
C - Crankshaft
D - Cylinder

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 5:

In the two-stage compressor shown here, on the down stroke of the left piston, the _____________closes, and the pressure above the piston and the suction valve discs drops below the suction (crankcase) pressure, causing the _______________ to lift open and allows vapour to pass into the cylinder above the piston.

A - discharge valve; suction valves
B - suction port; discharge valve
C - right cylinder; suction valves
D - intake valve; left cylinder

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 6:

The disc valve basic part labeled "A" in the diagram is called the:

A - Upper valve body
B - Valve seat
C - Lower valve body
D - Stop plate

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 7:

The disc valve basic part labeled "B" in the diagram is called the:

A - Valve disc
B - Valve spring
C - Valve channels
D - Poppets

Correctness Rule: Single Correct Answer Required

Answer(s) Given: A
Correct Answer(s): A
Marked as: Correct

_______________________________________________

Question 8:

The number of rings that are fitted to the piston of a compressor is determined by the:

A - Barometric pressure that is developed across the piston
B - Cylinder length
C - Piston diameter
D - Pressure differential that is developed across the piston

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 9:

The frame of a reciprocating compressor is almost invariably made of:

A - Stainless steel
B - Cast iron
C - Wrought iron
D - Concrete

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 10:

The reciprocating compressor running gear component that has a threaded hole in one end into which the piston rod fits is called the:

A - Connection rod
B - Cylinder
C - Crankshaft
D - Crosshead

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

Question 1:

Idling an engine for a few minutes prior to total shutdown avoids:

A - Warping engine camshafts
B - Warping engine crankshafts
C - Warping engine intake valves
D - Warping engine exhaust valves

Correct Answer(s): D

Question 2:

When shutting down a compressor unit, after the engine has been slowed, the next thing that should be done is to:

A - Unload the compressor cylinders
B - Idle the unit for a few minutes to cool down
C - Shut off the cooling water supply
D - Shut off the fuel gas cock

Correct Answer(s): A

Question 3:

Compressor cylinders operating on bypass may:

A - Result in warping cylinder parts
B - Damage the governor
C - Cause hydrates to form
D - Heat up

Correct Answer(s): D

Question 4:

Pulling vacuum on compressor cylinders is recommended during start-up because it allows air to enter through packing and achieve maximum compression efficiency in a shorter time.

A - True
B - False

Correct Answer(s): B

Question 5:

When starting a gas compressor, after the engine has been started, and the lubrication systems have been checked, the next step in the sequence is to:

A - Shut the starting air supply valve
B - Increase the engine speed slightly when loading
C - Run the engine at slow speed
D - Reset the panel timer and turn the magneto switch to ON

Correct Answer(s): B

Question 6:

Care must be taken in sizing gas engines at altitudes above sea level because:

A - These engines are ideal for direct connecting to high speed reciprocating compressors
B - Pumping stations are often in remote areas, where only gas is available for power
C - These engines are available in two- and four-stroke cycle designs up to 5 000 kW
D - These engines lose 8 to 10% of their sea-level rated power at 1 500 m

Correct Answer(s): D

Question 7:

During a typical automatic start-up of a compressor, the starting gas is usually left open after the compressor starts to prevent further shutdowns.

A - True
B - False

Correct Answer(s): B

Question 8:

When stopping a compressor unit, turning the magneto unit to the ____ position is not recommended because the unburned gas will enter the ___________ system and ignite.

A - OFF; intake
B - ON; intake
C - ON; exhaust
D - OFF; exhaust

Correct Answer(s): D

Question 9:

On naturally aspirated and turbocharged engines that are used to drive gas compressors, the fuel gas shutoff and vent valve are actuated by the safety shutdown system.

A - True
B - False

Correct Answer(s): A

Question 10:

Engines for gas compression services are usually equipped with which of the following shutdowns:

A - High lube oil pressure
B - Low jacket water temperature
C - High jacket water temperature
D - Variable speed

Correct Answer(s): C

Question 1:

Care must be taken in sizing gas engines at altitudes above sea level because:

A - These engines are available in two- and four-stroke cycle designs up to 5 000 kW
B - Pumping stations are often in remote areas, where only gas is available for power
C - These engines are ideal for direct connecting to high speed reciprocating compressors
D - These engines lose 8 to 10% of their sea-level rated power at 1 500 m

Correct Answer(s): D

Question 2:

A turbocharger may increase the output of a given engine by as much as:

A - 30%
B - 90%
C - 50%
D - 15%

Correct Answer(s): C

Question 3:

In most cases, the choice of the appropriate driver for a gas compressor is ultimately determined by the:

A - Type or source of available power
B - Horsepower requirements
C - Nature of the gas being compressed
D - Compression ratio of the compressor

Correct Answer(s): A

Question 4:

A turbocharger is driven by:

A - The exhaust gas of the engine
B - Engine lubricating oil pressure
C - Belts connected to the engine crankshaft
D - A separate motor

Correct Answer(s): A

Question 5:

When starting a gas compressor, after the engine has been started, and the lubrication systems have been checked, the next step in the sequence is to:

A - Increase the engine speed slightly when loading
B - Reset the panel timer and turn the magneto switch to ON
C - Shut the starting air supply valve
D - Run the engine at slow speed

Correct Answer(s): A

Question 6:

When shutting down a compressor unit, after the engine has been slowed, the next thing that should be done is to:

A - Shut off the fuel gas cock
B - Unload the compressor cylinders
C - Idle the unit for a few minutes to cool down
D - Shut off the cooling water supply

Correct Answer(s): B

Question 7:

A compressor log book should include:

A - Readings such as temperatures and pressures
B - Details of maintenance work
C - Any unusual conditions experiences
D - All of the above

Correct Answer(s): D

Question 8:

During a typical automatic start-up of a compressor, the starting gas is usually left open after the compressor starts to prevent further shutdowns.

A - True
B - False

Correct Answer(s): B

Question 9:

A naturally aspirated integral engine has which of the following components in its fuel system?

A - A vaporizer
B - A fuel-mixing valve
C - An atomizer
D - A carburetor

Correct Answer(s): B

Question 10:

One advantage of turbocharging an engine used to drive a compressor is that the:

A - Total heat rejection to the jacket water is reduced approximately 30% less than a naturally aspirated engine
B - Thermal efficiency is improved and fuel consumption is reduced
C - Thermal efficiency is improved but fuel consumption is increased
D - Total heat rejection to the jacket water is increased approximately 30% more than a naturally aspirated engine

Correct Answer(s): B

Question 1:

Pulling vacuum on compressor cylinders is recommended during start-up because it allows air to enter through packing and achieve maximum compression efficiency in a shorter time.

A - True
B - False

Correct Answer(s): B

Question 2:

In most cases, the choice of the appropriate driver for a gas compressor is ultimately determined by the:

A - Horsepower requirements
B - Type or source of available power
C - Compression ratio of the compressor
D - Nature of the gas being compressed

Correct Answer(s): B

Question 3:

In plants where steam is available at a premium,______________ utilizing ________________ rates are used.

A - multistage turbine; low steam
B - multistage turbine; high steam
C - single stage turbine; low steam
D - single stage turbine; high steam

Correct Answer(s): A

Question 4:

A compressor log book should include:

A - Readings such as temperatures and pressures
B - Details of maintenance work
C - Any unusual conditions experiences
D - All of the above

Correct Answer(s): D

Question 5:

When starting a gas compressor, after the engine has been started, and the lubrication systems have been checked, the next step in the sequence is to:

A - Increase the engine speed slightly when loading
B - Shut the starting air supply valve
C - Reset the panel timer and turn the magneto switch to ON
D - Run the engine at slow speed

Correct Answer(s): A

Question 6:

Idling an engine for a few minutes prior to total shutdown avoids:

A - Warping engine camshafts
B - Warping engine intake valves
C - Warping engine exhaust valves
D - Warping engine crankshafts

Correct Answer(s): C

Question 7:

On naturally aspirated and turbocharged engines that are used to drive gas compressors, the fuel gas shutoff and vent valve are actuated by the safety shutdown system.

A - True
B - False

Correct Answer(s): A

Question 8:

Induction motors are simple, rugged and reliable, and have no:

A - Moving parts
B - Limit to the applications for which they may be used
C - Rotating windings
D - Bearings requiring lubrication

Correct Answer(s): C

Question 9:

A naturally aspirated integral engine has which of the following components in its fuel system?

A - A vaporizer
B - An atomizer
C - A carburetor
D - A fuel-mixing valve
Correct Answer(s): D

Question 10:

One advantage of turbocharging an engine used to drive a compressor is that the:

A - Total heat rejection to the jacket water is increased approximately 30% more than a naturally aspirated engine
B - Total heat rejection to the jacket water is reduced approximately 30% less than a naturally aspirated engine
C - Thermal efficiency is improved but fuel consumption is increased
D - Thermal efficiency is improved and fuel consumption is reduced

Correct Answer(s): D

Question 1:

When starting a gas compressor, after the engine has been started, and the lubrication systems have been checked, the next step in the sequence is to:

A - Increase the engine speed slightly when loading
B - Run the engine at slow speed
C - Reset the panel timer and turn the magneto switch to ON
D - Shut the starting air supply valve

Correct Answer(s): A

Question 2:

In plants where steam is available at a premium,______________ utilizing ________________ rates are used.

A - multistage turbine; low steam
B - single stage turbine; high steam
C - multistage turbine; high steam
D - single stage turbine; low steam

Correct Answer(s): A

Question 3:

A naturally aspirated integral engine has which of the following components in its fuel system?

A - A carburetor
B - A vaporizer
C - An atomizer
D - A fuel-mixing valve

Correct Answer(s): D
Question 4:

Where gas is readily available and a high-speed, direct connection to a centrifugal compressor is desirable, the most practical compressor driver to install is a/an:

A - Steam turbine
B - Gasoline engine
C - Gas turbine
D - Induction motor

Correct Answer(s): C

Question 5:

When shutting down a compressor unit, after the engine has been slowed, the next thing that should be done is to:

A - Shut off the cooling water supply
B - Idle the unit for a few minutes to cool down
C - Unload the compressor cylinders
D - Shut off the fuel gas cock

Correct Answer(s): C

Question 6:

On naturally aspirated and turbocharged engines that are used to drive gas compressors, the fuel gas shutoff and vent valve are actuated by the safety shutdown system.

A - True
B - False

Correct Answer(s): A

Question 7:

Induction motors are simple, rugged and reliable, and have no:

A - Moving parts
B - Limit to the applications for which they may be used
C - Bearings requiring lubrication
D - Rotating windings

Correct Answer(s): D

Question 8:

Pulling vacuum on compressor cylinders is recommended during start-up because it allows air to enter through packing and achieve maximum compression efficiency in a shorter time.

A - True
B - False

Correct Answer(s): B

Question 9:

One advantage of turbocharging an engine used to drive a compressor is that the:

A - Thermal efficiency is improved and fuel consumption is reduced
B - Thermal efficiency is improved but fuel consumption is increased
C - Total heat rejection to the jacket water is reduced approximately 30% less than a naturally aspirated engine
D - Total heat rejection to the jacket water is increased approximately 30% more than a naturally aspirated engine

Correct Answer(s): A

Question 10:

A turbocharger is driven by:

A - A separate motor
B - Belts connected to the engine crankshaft
C - The exhaust gas of the engine
D - Engine lubricating oil pressure

Correct Answer(s): C

Question 1:

Engines for gas compression services are usually equipped with which of the following engine protection shutdowns:

A - Low jacket water temperature
B - High lube oil pressure
C - Overspeed
D - Fuel pressure

Correct Answer(s): C

Question 2:

In most cases, the choice of the appropriate driver for a gas compressor is ultimately determined by the:

A - Type or source of available power
B - Nature of the gas being compressed
C - Horsepower requirements
D - Compression ratio of the compressor

Correct Answer(s): A

Question 3:

A compressor log book should include:

A - Readings such as temperatures and pressures
B - Details of maintenance work
C - Any unusual conditions experiences
D - All of the above

Correct Answer(s): D

Question 4:

Where gas is readily available and a high-speed, direct connection to a centrifugal compressor is desirable, the most practical compressor driver to install is a/an:

A - Gasoline engine
B - Gas turbine
C - Steam turbine
D - Induction motor

Correct Answer(s): B

Question 5:

One advantage of turbocharging an engine used to drive a compressor is that the:

A - Total heat rejection to the jacket water is reduced approximately 30% less than a naturally aspirated engine
B - Thermal efficiency is improved but fuel consumption is increased
C - Thermal efficiency is improved and fuel consumption is reduced
D - Total heat rejection to the jacket water is increased approximately 30% more than a naturally aspirated engine

Correct Answer(s): C

Question 6:

Idling an engine for a few minutes prior to total shutdown avoids:

A - Warping engine exhaust valves
B - Warping engine camshafts
C - Warping engine intake valves
D - Warping engine crankshafts

Correct Answer(s): A

Question 7:

Pulling vacuum on compressor cylinders is recommended during start-up because it allows air to enter through packing and achieve maximum compression efficiency in a shorter time.

A - True
B - False

Correct Answer(s): B

Question 8:

When stopping a compressor unit, turning the magneto unit to the ____ position is not recommended because the unburned gas will enter the ___________ system and ignite.

A - OFF; exhaust
B - ON; exhaust
C - ON; intake
D - OFF; intake

Correct Answer(s): A

Question 9:

When shutting down a compressor unit, after the engine has been slowed, the next thing that should be done is to:

A - Unload the compressor cylinders
B - Shut off the fuel gas cock
C - Idle the unit for a few minutes to cool down
D - Shut off the cooling water supply

Correct Answer(s): A

Question 10:

The most widely used compressor driver in the low power range is the:

A - Gas turbine
B - Synchronous motor
C - Squirrel cage induction motor
D - Steam turbine

Correct Answer(s): C

Question 1:

In a natural gas-powered engine used to run a compressor, the oil temperature is usually controlled by a ___________________ that has the engine _________________ circulating through it.

A - shell and tube heat exchanger; crankcase oil
B - pipe coil heat exchanger; crankcase oil
C - pipe coil heat exchanger; jacket water
D - shell and tube heat exchanger; jacket water

Correct Answer(s): D

Question 2:

When stopping a compressor unit, turning the magneto unit to the ____ position is not recommended because the unburned gas will enter the ___________ system and ignite.

A - OFF; exhaust
B - ON; intake
C - ON; exhaust
D - OFF; intake

Correct Answer(s): A

Question 3:

Where gas is readily available and a high-speed, direct connection to a centrifugal compressor is desirable, the most practical compressor driver to install is a/an:

A - Induction motor
B - Steam turbine
C - Gas turbine
D - Gasoline engine

Date: 2015-12-11; view: 810