ABSA-Power Engineer Class 4- Part B
ALL QUESTIONS And Correct
Answers Graded A+.
The resistance of a liquid to internal deformation or shear is known as: - Answer Viscosity
If an oil must flow at a very low temperature, it must have the following additive: - Answer
Pour point depressant
An anti-friction bearing: - Answer Has rolling friction
The ability of an oil to lift and support heavy loads depends upon: - Answer Hydraulic
pressure
Which type of oil produces higher fluid friction? - Answer High viscosity oil
A shell type bearing: - Answer Is used for heavy loads
A journal bearing: - Answer Supports a shaft
If ambient air temperatures are very low, the preferred lubricant is a: - Answer Solid
A normal anti-friction bearing temperature operating range is: - Answer 65°C to 70°C
Which of the following has the greatest effect on the viscosity of lubrication oil? - Answer
Temperature
Where gear teeth inter-mesh, a lubricant must provide - Answer Shock absorption
The lubricant for an anti-friction bearing: - Answer Could be a semi-solid lubricant
A rotary pump: - Answer Should be equipped with a relief valve
When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as: -
Answer Pressure head
,Sliding vane compressors: - Answer Are positive displacement compressors
A pump is capable of suction lift due to: - Answer Atmospheric pressure
The compressor that would favour volume over pressure would be the: - Answer Centrifugal
The name given to the category of pumps that use gear teeth, vanes, or lobes to move the fluid
being pumped is the _____ type. - Answer Rotary
A diffuser pump: - Answer Is more effective at changing velocity to pressure than a volute
pump
It is generally accurate to say that: _____________ results from every metre of water depth or
height - Answer 9.8 kPa pressure
The capacity of a centrifugal pump should only be reduced by: - Answer Throttling the
discharge valve
Which of the following air compressors gives two compression strokes per crankshaft
revolution? - Answer Single cylinder double acting compressor
Centrifugal pump power requirements are decreased when: - Answer The mass of fluid
delivered is decreased
The difference between static suction head and static discharge head is: - Answer Total static
head
A reciprocating air compressor works on the principle of: - Answer Volume reduction
A low water fuel cutoff on an unattended steam boiler shall be installed so that - Answer It
cannot be rendered inoperative
A low fire start switch: - Answer Acts as a pre-ignition interlock to ensure minimum damper
setting during ignition
When differential pressure is used to measure water level in a boiler steam drum, the
differential pressure is: - Answer Greatest when drum level is low
,A high gas pressure fuel cut-off switch: - Answer Prevents excessive fuel pressure from
creating an unstable flame condition
The discharge pipe from a boiler safety valve is supported independently of the safety valve: -
Answer So the discharge pipe can expand without putting force on the safety valve
The minimum DN size of the blowoff piping of a steam heating boiler is: - Answer 20 mm
When an automatic unattended boiler starts up, the programming control will first: - Answer
Start the forced draft fan
The prime importance of boiler fittings is: - Answer Safety & efficiency
If a safety valve leaks after a try lever test, the operator should: - Answer Operate the try
lever several times to blow away foreign material
Thermocouples are connected in series to: - Answer Generate a higher voltage
The safety valves on a boiler are set to open at 1380 kPa. The boiler MAWP is 1380 kPa. How
much higher can the boiler pressure rise above 1380 kPa, if it is fired at full capacity with the
steam outlet valve closed? - Answer 82.8 kPa
Transparent gauge glasses are lined with mica to: - Answer Protect the glass
If a steam boiler is in service and no water level shows in the gauge glass, the first action would
be to: - Answer determine whether the gauge glass is completely full or completely empty.
In a multiple boiler high pressure steam plant, when starting an entire system from cold -
Answer The entire system warms and pressurizes as one boiler warms, except for the boilers
being left off line.
How often should the low water cut-off of a low pressure steam heating boiler be blown off? -
Answer Daily
To confirm a hot water heating system is full, - Answer the pressure shown on the tridicator
gauge must exceed the altitude indication.
, When preparing to start a steam boiler with a fully modulating firing rate control, set the
manual-automatic switch to _________ and the flame control switch to the __________
position. - Answer manual, low-fire
When a combustion air opening is equipped with dampers, the dampers must be - Answer
interlocked with the burner, and fully open before starting the boiler.
On a boiler fuel system that has a "double block and bleed" arrangement: - Answer The
"bleed" valve is a normally open solenoid valve.
If a cold boiler is warmed up slowly - Answer it will develop less stress due to uneven
thermal expansion.
Which of the following is NOT a way to maintain a positive pressure on a boiler during a wet
layup? - Answer use an oxygen scavenger.
The procedure for cutting a power boiler into a pressurized steam header is described in -
Answer ASME Section VII.
What pressure is applied to a boiler during a hydrostatic test? - Answer 1.5 times the
maximum allowable working pressure.
Which one of these government agencies or regulations covers the use and erection of work
platforms? - Answer Occupational Health and Safety Act and Regulation
Soot should be removed from firetube boiler tubes with: - Answer wire brushes
When two or more sling eyes are used when lifting an object, they should be: - Answer Held
in a shackle
The purpose of annealing boiler tube ends is to: - Answer Soften the tube ends
The final step when replacing a firetube is: - Answer Hydrostatic test
"Laying up" a boiler means: - Answer Preparing the boiler for a period of storage
When the fireside of a boiler is opened up, locations of water leakage may be detected by: -
Answer White dissolved solids left from water evaporation
ALL QUESTIONS And Correct
Answers Graded A+.
The resistance of a liquid to internal deformation or shear is known as: - Answer Viscosity
If an oil must flow at a very low temperature, it must have the following additive: - Answer
Pour point depressant
An anti-friction bearing: - Answer Has rolling friction
The ability of an oil to lift and support heavy loads depends upon: - Answer Hydraulic
pressure
Which type of oil produces higher fluid friction? - Answer High viscosity oil
A shell type bearing: - Answer Is used for heavy loads
A journal bearing: - Answer Supports a shaft
If ambient air temperatures are very low, the preferred lubricant is a: - Answer Solid
A normal anti-friction bearing temperature operating range is: - Answer 65°C to 70°C
Which of the following has the greatest effect on the viscosity of lubrication oil? - Answer
Temperature
Where gear teeth inter-mesh, a lubricant must provide - Answer Shock absorption
The lubricant for an anti-friction bearing: - Answer Could be a semi-solid lubricant
A rotary pump: - Answer Should be equipped with a relief valve
When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as: -
Answer Pressure head
,Sliding vane compressors: - Answer Are positive displacement compressors
A pump is capable of suction lift due to: - Answer Atmospheric pressure
The compressor that would favour volume over pressure would be the: - Answer Centrifugal
The name given to the category of pumps that use gear teeth, vanes, or lobes to move the fluid
being pumped is the _____ type. - Answer Rotary
A diffuser pump: - Answer Is more effective at changing velocity to pressure than a volute
pump
It is generally accurate to say that: _____________ results from every metre of water depth or
height - Answer 9.8 kPa pressure
The capacity of a centrifugal pump should only be reduced by: - Answer Throttling the
discharge valve
Which of the following air compressors gives two compression strokes per crankshaft
revolution? - Answer Single cylinder double acting compressor
Centrifugal pump power requirements are decreased when: - Answer The mass of fluid
delivered is decreased
The difference between static suction head and static discharge head is: - Answer Total static
head
A reciprocating air compressor works on the principle of: - Answer Volume reduction
A low water fuel cutoff on an unattended steam boiler shall be installed so that - Answer It
cannot be rendered inoperative
A low fire start switch: - Answer Acts as a pre-ignition interlock to ensure minimum damper
setting during ignition
When differential pressure is used to measure water level in a boiler steam drum, the
differential pressure is: - Answer Greatest when drum level is low
,A high gas pressure fuel cut-off switch: - Answer Prevents excessive fuel pressure from
creating an unstable flame condition
The discharge pipe from a boiler safety valve is supported independently of the safety valve: -
Answer So the discharge pipe can expand without putting force on the safety valve
The minimum DN size of the blowoff piping of a steam heating boiler is: - Answer 20 mm
When an automatic unattended boiler starts up, the programming control will first: - Answer
Start the forced draft fan
The prime importance of boiler fittings is: - Answer Safety & efficiency
If a safety valve leaks after a try lever test, the operator should: - Answer Operate the try
lever several times to blow away foreign material
Thermocouples are connected in series to: - Answer Generate a higher voltage
The safety valves on a boiler are set to open at 1380 kPa. The boiler MAWP is 1380 kPa. How
much higher can the boiler pressure rise above 1380 kPa, if it is fired at full capacity with the
steam outlet valve closed? - Answer 82.8 kPa
Transparent gauge glasses are lined with mica to: - Answer Protect the glass
If a steam boiler is in service and no water level shows in the gauge glass, the first action would
be to: - Answer determine whether the gauge glass is completely full or completely empty.
In a multiple boiler high pressure steam plant, when starting an entire system from cold -
Answer The entire system warms and pressurizes as one boiler warms, except for the boilers
being left off line.
How often should the low water cut-off of a low pressure steam heating boiler be blown off? -
Answer Daily
To confirm a hot water heating system is full, - Answer the pressure shown on the tridicator
gauge must exceed the altitude indication.
, When preparing to start a steam boiler with a fully modulating firing rate control, set the
manual-automatic switch to _________ and the flame control switch to the __________
position. - Answer manual, low-fire
When a combustion air opening is equipped with dampers, the dampers must be - Answer
interlocked with the burner, and fully open before starting the boiler.
On a boiler fuel system that has a "double block and bleed" arrangement: - Answer The
"bleed" valve is a normally open solenoid valve.
If a cold boiler is warmed up slowly - Answer it will develop less stress due to uneven
thermal expansion.
Which of the following is NOT a way to maintain a positive pressure on a boiler during a wet
layup? - Answer use an oxygen scavenger.
The procedure for cutting a power boiler into a pressurized steam header is described in -
Answer ASME Section VII.
What pressure is applied to a boiler during a hydrostatic test? - Answer 1.5 times the
maximum allowable working pressure.
Which one of these government agencies or regulations covers the use and erection of work
platforms? - Answer Occupational Health and Safety Act and Regulation
Soot should be removed from firetube boiler tubes with: - Answer wire brushes
When two or more sling eyes are used when lifting an object, they should be: - Answer Held
in a shackle
The purpose of annealing boiler tube ends is to: - Answer Soften the tube ends
The final step when replacing a firetube is: - Answer Hydrostatic test
"Laying up" a boiler means: - Answer Preparing the boiler for a period of storage
When the fireside of a boiler is opened up, locations of water leakage may be detected by: -
Answer White dissolved solids left from water evaporation
