Power Engineering - 4B2 UPDATED ACTUAL Questions and CORRECT
Answers
Question: A pump is capable of suction lift due to a. its ability to convert kinetic energy into potential
energy b. the speed at which it operates c. its input power d. its size e. atmospheric pressure
Correct Answer: e. atmospheric pressure
Question: Centrifugal pumps do not develop good suction lift because a. atmospheric pressure is usually
too low b. the pumped medium relative density is too high c. their internal component clearances are too
high d. the speed is too low e. they favour pressure rather than volume
Correct Answer: c. their internal component clearances are too high
Question: It is generally accurate to say that a. 9.8 kPa pressure results from every metre of water depth or
height b. a water height or depth of 10.34 metres results in 1 kPa c. 1 kPa will result from a water head of
9.8 metres d. 10.21 kPa will result from 1 metre of static water head e. atmospheric pressure has no bearing
on static water head
Correct Answer: a. 9.8 kPa pressure results from every metre of water depth or height
Question: Preferably, dynamic pumps should be located a. directly under the liquid source when suction
lift is involved b. above the liquid source when suction head is involved c. above the liquid source when
suction lift is involved d. at the liquid source level when suction lift is involved e. below the liquid source
when suction head is involved
Correct Answer: e. below the liquid source when suction head is involved
Question: The vertical distance from the liquid surface up to the pump centre-line plus the vertical distance
from the pump centre-line up to the surface of the liquid in the discharge tank is a. static discharge head b.
static suction head c. suction lift d. total discharge head e. total static head
Correct Answer: e. total static head
Question: The difference between static suction head and static discharge head is a. total static head b.
static discharge head c. static suction head d. equivalent head e. dynamic head
Correct Answer: a. total static head
Question: When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as a.
dynamic head b. equivalent head c. discharge head d. friction head e. total static head
Correct Answer: b. equivalent head
Question: The total static head of a pump a. is the capacity of the pump b. is the difference between the
static suction head and the static discharge head c. is the discharge pressure in metres d. is all the parts of
the pump casing e. is the discharge head of the pump
Correct Answer: b. is the difference between the static suction head and the static discharge head
Question: When a reciprocating pump discharges while its piston or plunger moves in only one direction, it
is termed a a. positive displacement unit b. single acting unit c. dynamic unit d. double acting unit e. duplex
unit
Correct Answer: b. single acting unit
,Question: Centrifugal pumps convert rotating mechanical energy into kinetic energy then a. discharge the
kinetic energy b. back to mechanical energy c. absorb the energy d. into potential energy in the form of
pressure e. into centrifugal force
Correct Answer: d. into potential energy in the form of pressure
Question: A hot water heating system circulator should a. be directly coupled b. have its own vibration-free
base c. be very quiet in operation d. develop an extremely high differential pressure e. not run continuously
Correct Answer: c. be very quiet in operation
Question: The capacity of a centrifugal pump a. varies with discharge pressure b. can be altered by speed
variation only c. indicates that the unit is a positive displacement type d. should be varied by suction valve
manipulation e. is fixed and can only be altered by changing the impeller
Correct Answer: a. varies with discharge pressure
Question: Centrifugal pump power requirements are decreased when a. discharge pressure is decreased b.
the litres moved per minute is decreased c. the casing pressure drops d. the discharge velocity is high e. the
discharge head is at minimum
Correct Answer: b. the litres moved per minute is decreased
Question: A rotary pump a. is a variety of dynamic unit b. never has discharge pulsations c. should be
equipped with a relief valve d. has the highest capacity of any pump e. never requires cylinder lubrication
Correct Answer: c. should be equipped with a relief valve
Question: When starting-up a rotary pump you must be sure that the a. discharge valve is closed b.
discharge valve is open c. pump is filled with air d. pump is at the correct temperature e. pump suction
valve is closed
Correct Answer: b. discharge valve is open
Question: Rotary pumps
Correct Answer: 1. are high pressure pumps 2. must be primed 3. use mechanical seals 4. are positive
displacement pumps a. 1, 2 b. 2, 3 c. 1, 4 d. 1, 3, 4 e. 1, 2, 3, 4: c. 1, 4
Question: A double-acting pump a. has two pistons on the pump end b. will always be driven by the steam
pistons c. has two pistons on the driver end d. will have two slide valves e. is a positive displacement pump
Correct Answer: e. is a positive displacement pump
Question: A volute type pump a. is a positive displacement pump b. has a progressively expanding spiral
casing c. reduces the velocity in the discharge nozzle d. is more costly than diffuser pumps e. is a
regenerative type pump
Correct Answer: b. has a progressively expanding spiral casing
Question: A diffuser pump
Correct Answer: 1. has stationary guide vanes surrounding the impeller 2. has a higher efficiency than a
volute type 3. has high suction lift 4. does not have to be primed a. 1 b. 3 c. 2, 3 d. 1, 2 e. 4: d. 1, 2
Question: Turbine pumps
Correct Answer: 1. are high capacity pumps 2. are high pressure pumps 3. has the liquid gain energy in a
number of impulses a. 1 b. 1, 2 c. 2, 3 d. 1, 2, 3 e. 1, 3: c. 2, 3
, Question: A centrifugal pump consists of a. an impeller surrounded by a casing b. a piston moving to and
fro in a cylinder c. gears rotating in a housing d. sliding vanes e. pulsating disc
Correct Answer: a. an impeller surrounded by a casing
Question: Cavitation of a pump refers to, when
Correct Answer: a. the pump is filled with air b. the pump is filled with vapour c. the oil ring is damaged
d. the suction valve is open e. the pump is steam driven: b. the pump is filled with vapour
Question: Rotary pumps
Correct Answer: 1. have tight clearances on all moving parts 2. deliver high pressure liquid without
pulsations 3. are positive displacement units 4. should not be started with discharge closed a. 1 b. 1, 2 c. 1,
2, 3, 4 d. 1, 3, 4 e. 2, 3: c. 1, 2, 3, 4
Question: If a pump is cavitating what can you do to prevent or reduce the cavitation? a. close the casing
vent valve b. open the vent valve and close the suction valve c. partially close the suction valve d. close the
discharge valve e. raise the suction pressure
Correct Answer: e. raise the suction pressure
Question: A positive displacement stand by-pump will have a. the vent and drain valves open b. the suction
valve closed and the discharge valve open c. the suction valve open and the discharge closed d. the suction
valve open and the discharge valve open e. the suction valve and the discharge valves closed
Correct Answer: d. the suction valve open and the discharge valve open
Question: Pumps handling cryogenic materials operate a. as staged units b. at extremely low temperatures
c. nearly always as dynamic units d. as tandem units e. as high speed units
Correct Answer: b. at extremely low temperatures
Question: A circulating pump is usually a. connected with some type of heat exchanger system b. a once
through device c. mounted to the piping d. a small capacity unit e. a high head unit
Correct Answer: a. connected with some type of heat exchanger system
Question: A multi-stage pump would be used a. when the lift is great b. when a greater volume must be
pumped c. when the head is great d. when the temperature of the water being pumped is high e. whenever
there is sufficient boiler room floor space
Correct Answer: c. when the head is great
Question: Turbine pumps are best suited for a. low capacity low pressure service b. low capacity high
pressure service c. high capacity high pressure service d. high capacity low pressure service e. heavy
viscous fluids
Correct Answer: b. low capacity high pressure service
Question: Pump wear rings are installed on an impeller by set screws, threading or a. shrinking b. welding
c. brazing d. soldering e. forging
Correct Answer: a. shrinking
Question: Wear rings are usually constructed of a. ceramics or aluminum b. graphite or bronze c. bronze or
cast iron d. steel or alloy steel e. wrought iron or pig iron
Correct Answer: c. bronze or cast iron
Answers
Question: A pump is capable of suction lift due to a. its ability to convert kinetic energy into potential
energy b. the speed at which it operates c. its input power d. its size e. atmospheric pressure
Correct Answer: e. atmospheric pressure
Question: Centrifugal pumps do not develop good suction lift because a. atmospheric pressure is usually
too low b. the pumped medium relative density is too high c. their internal component clearances are too
high d. the speed is too low e. they favour pressure rather than volume
Correct Answer: c. their internal component clearances are too high
Question: It is generally accurate to say that a. 9.8 kPa pressure results from every metre of water depth or
height b. a water height or depth of 10.34 metres results in 1 kPa c. 1 kPa will result from a water head of
9.8 metres d. 10.21 kPa will result from 1 metre of static water head e. atmospheric pressure has no bearing
on static water head
Correct Answer: a. 9.8 kPa pressure results from every metre of water depth or height
Question: Preferably, dynamic pumps should be located a. directly under the liquid source when suction
lift is involved b. above the liquid source when suction head is involved c. above the liquid source when
suction lift is involved d. at the liquid source level when suction lift is involved e. below the liquid source
when suction head is involved
Correct Answer: e. below the liquid source when suction head is involved
Question: The vertical distance from the liquid surface up to the pump centre-line plus the vertical distance
from the pump centre-line up to the surface of the liquid in the discharge tank is a. static discharge head b.
static suction head c. suction lift d. total discharge head e. total static head
Correct Answer: e. total static head
Question: The difference between static suction head and static discharge head is a. total static head b.
static discharge head c. static suction head d. equivalent head e. dynamic head
Correct Answer: a. total static head
Question: When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as a.
dynamic head b. equivalent head c. discharge head d. friction head e. total static head
Correct Answer: b. equivalent head
Question: The total static head of a pump a. is the capacity of the pump b. is the difference between the
static suction head and the static discharge head c. is the discharge pressure in metres d. is all the parts of
the pump casing e. is the discharge head of the pump
Correct Answer: b. is the difference between the static suction head and the static discharge head
Question: When a reciprocating pump discharges while its piston or plunger moves in only one direction, it
is termed a a. positive displacement unit b. single acting unit c. dynamic unit d. double acting unit e. duplex
unit
Correct Answer: b. single acting unit
,Question: Centrifugal pumps convert rotating mechanical energy into kinetic energy then a. discharge the
kinetic energy b. back to mechanical energy c. absorb the energy d. into potential energy in the form of
pressure e. into centrifugal force
Correct Answer: d. into potential energy in the form of pressure
Question: A hot water heating system circulator should a. be directly coupled b. have its own vibration-free
base c. be very quiet in operation d. develop an extremely high differential pressure e. not run continuously
Correct Answer: c. be very quiet in operation
Question: The capacity of a centrifugal pump a. varies with discharge pressure b. can be altered by speed
variation only c. indicates that the unit is a positive displacement type d. should be varied by suction valve
manipulation e. is fixed and can only be altered by changing the impeller
Correct Answer: a. varies with discharge pressure
Question: Centrifugal pump power requirements are decreased when a. discharge pressure is decreased b.
the litres moved per minute is decreased c. the casing pressure drops d. the discharge velocity is high e. the
discharge head is at minimum
Correct Answer: b. the litres moved per minute is decreased
Question: A rotary pump a. is a variety of dynamic unit b. never has discharge pulsations c. should be
equipped with a relief valve d. has the highest capacity of any pump e. never requires cylinder lubrication
Correct Answer: c. should be equipped with a relief valve
Question: When starting-up a rotary pump you must be sure that the a. discharge valve is closed b.
discharge valve is open c. pump is filled with air d. pump is at the correct temperature e. pump suction
valve is closed
Correct Answer: b. discharge valve is open
Question: Rotary pumps
Correct Answer: 1. are high pressure pumps 2. must be primed 3. use mechanical seals 4. are positive
displacement pumps a. 1, 2 b. 2, 3 c. 1, 4 d. 1, 3, 4 e. 1, 2, 3, 4: c. 1, 4
Question: A double-acting pump a. has two pistons on the pump end b. will always be driven by the steam
pistons c. has two pistons on the driver end d. will have two slide valves e. is a positive displacement pump
Correct Answer: e. is a positive displacement pump
Question: A volute type pump a. is a positive displacement pump b. has a progressively expanding spiral
casing c. reduces the velocity in the discharge nozzle d. is more costly than diffuser pumps e. is a
regenerative type pump
Correct Answer: b. has a progressively expanding spiral casing
Question: A diffuser pump
Correct Answer: 1. has stationary guide vanes surrounding the impeller 2. has a higher efficiency than a
volute type 3. has high suction lift 4. does not have to be primed a. 1 b. 3 c. 2, 3 d. 1, 2 e. 4: d. 1, 2
Question: Turbine pumps
Correct Answer: 1. are high capacity pumps 2. are high pressure pumps 3. has the liquid gain energy in a
number of impulses a. 1 b. 1, 2 c. 2, 3 d. 1, 2, 3 e. 1, 3: c. 2, 3
, Question: A centrifugal pump consists of a. an impeller surrounded by a casing b. a piston moving to and
fro in a cylinder c. gears rotating in a housing d. sliding vanes e. pulsating disc
Correct Answer: a. an impeller surrounded by a casing
Question: Cavitation of a pump refers to, when
Correct Answer: a. the pump is filled with air b. the pump is filled with vapour c. the oil ring is damaged
d. the suction valve is open e. the pump is steam driven: b. the pump is filled with vapour
Question: Rotary pumps
Correct Answer: 1. have tight clearances on all moving parts 2. deliver high pressure liquid without
pulsations 3. are positive displacement units 4. should not be started with discharge closed a. 1 b. 1, 2 c. 1,
2, 3, 4 d. 1, 3, 4 e. 2, 3: c. 1, 2, 3, 4
Question: If a pump is cavitating what can you do to prevent or reduce the cavitation? a. close the casing
vent valve b. open the vent valve and close the suction valve c. partially close the suction valve d. close the
discharge valve e. raise the suction pressure
Correct Answer: e. raise the suction pressure
Question: A positive displacement stand by-pump will have a. the vent and drain valves open b. the suction
valve closed and the discharge valve open c. the suction valve open and the discharge closed d. the suction
valve open and the discharge valve open e. the suction valve and the discharge valves closed
Correct Answer: d. the suction valve open and the discharge valve open
Question: Pumps handling cryogenic materials operate a. as staged units b. at extremely low temperatures
c. nearly always as dynamic units d. as tandem units e. as high speed units
Correct Answer: b. at extremely low temperatures
Question: A circulating pump is usually a. connected with some type of heat exchanger system b. a once
through device c. mounted to the piping d. a small capacity unit e. a high head unit
Correct Answer: a. connected with some type of heat exchanger system
Question: A multi-stage pump would be used a. when the lift is great b. when a greater volume must be
pumped c. when the head is great d. when the temperature of the water being pumped is high e. whenever
there is sufficient boiler room floor space
Correct Answer: c. when the head is great
Question: Turbine pumps are best suited for a. low capacity low pressure service b. low capacity high
pressure service c. high capacity high pressure service d. high capacity low pressure service e. heavy
viscous fluids
Correct Answer: b. low capacity high pressure service
Question: Pump wear rings are installed on an impeller by set screws, threading or a. shrinking b. welding
c. brazing d. soldering e. forging
Correct Answer: a. shrinking
Question: Wear rings are usually constructed of a. ceramics or aluminum b. graphite or bronze c. bronze or
cast iron d. steel or alloy steel e. wrought iron or pig iron
Correct Answer: c. bronze or cast iron
