Power Engineering 4th Class - A11 all questions and verified answers
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Module
Power Engineering
Institution
Power Engineering
Power Engineering 4th Class - A11 all questions and verified answers
The purpose of a superheater is to:
a. Control the pressure of the steam
b. Increase the temperature of the steam
c. Increase the steam output
d. Produce high pressure steam - ANS b
A membrane water wall:
a. Has wa...
Power Engineering 4th Class - A11 all
questions and verified answers
The purpose of a superheater is to:
a. Control the pressure of the steam
b. Increase the temperature of the steam
c. Increase the steam output
A
d. Produce high pressure steam - ANS b
VI
A membrane water wall:
a. Has waterproof membranes lining the tubes
TU
b. Has firebrick in front of the tubes
c. Has metal plates welded between the tubes
d. Consists of a metal sheeting in front of the tubes - ANS c
IS
A cyclone separator in a boiler steam drum:
a. Discharges water into the scrubbers
OM
b. Is located at the superheater outlet
c. Causes impurities to be thrown from the boiler water
d. Removes moisture from steam, using centrifugal force - ANS d
A high-pressure steam boiler is one in which steam is generated at a pressure greater
NA
than:
a. 76.4 kPa
b. 51.2 kPa
JP
c. 101.3 kPa
d. 100 kPa - ANS d
In a bottom-supported boiler, the steam drum is usually:
a. Placed between the centre line of the unit
b. Supported by piers
c. Supported by the water tubes
d. Supported by an overhead girder arrangement - ANS c
,An advantage of a packaged, low-pressure tubular or watertube boiler is:
a. Safety due to the low potential energy of the water contained within them
b. Its lower initial cost
c. Its less critical water treatment requirement
d. Its ability to meet load changes due to its heat reserve - ANS a
An early shell-type boiler had ___________ as its heating surface:
A
a. Two passes along the shell or drum
b. The total shell side and one end plate or head
VI
c. The lower part of the shell and the rear plate or head
d. Only the lower part of the shell - ANS d
TU
The steam space of a boiler must be large enough to:
a. Accommodate all the steam riser tubes
b. allow the steam to rise from the surface of the water
IS
c. Reduce the cooling effect of water
d. Keep the steam pressure down - ANS b
OM
As per ASME section I and section IV, a steam boiler operating at a pressure of ______
or higher is considered a Power Boiler.
a. 15 psig / 103.1 kPa
b. 14.7 psig / 100 kPa
NA
c. 14.7 psig / 101.3 kPa
d. 15 psig / 100 kPa - ANS d
The furnace walls in a bent-tube watertube boiler are formed by water filled tubes,
called:
JP
a. Waterside walls
b. Fireside walls
c. Waterwalls
d. Furnace walls - ANS c
When an air heater is used in a boiler:
, a. The boiler usually has only a forced draft fan
b. A balanced draft system cannot be used
c. It increases the efficiency of the boiler
d. The induced draft fan supplies combustion air to the air heater - ANS c
An advantage of a vertical tubeless firetube boiler is that it requires:
a. Very little water treatment
b. Less fuel for combustion
c. No fuel handling equipment
A
d. Relatively small floor space - ANS d
VI
Class 1 water treatment, as per ASME section VI, is suitable for:
a. Watertube Heating Boilers
TU
b. Tubular heating boilers
c. Firetube Heating Boilers
d. Cast Iron boilers - ANS d
IS
A watertube boiler is a boiler in which:
a. Combustion gases pass through the tubes
OM
b. Water passes around the tubes
c. Air passes through the tubes
d. Water passes through the tubes - ANS d
Immersion boiler tube bundles:
NA
a. Have negligible electrical resistance
b. Withstand extremely high temperatures and pressures
c. Can be easily removed from the unit for maintenance purposes
d. Conduct current through the boiler water - ANS c
JP
One type of electrode boiler depends on the electrodes being submerged in water in
order to generate steam. What safety device is not required on this type of electric
boiler?
a. Low water cut-off
b. Blow-off valve
c. Gauge glass
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