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