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Power engineering 5th class final exam questions and answers
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Power engineering 5th class final exam questions and answers
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Power engineering 5th classfinal exam questions and
answers
Cast-iron sectional boilers have flue gas passages which - answer
Increase heat transfer
Steel plate heating boilers have thin steel installed in the - answer
Firetubes to give the gases a swirling motion
The vertical firetube boiler has a cylindrical shell with tubes
connected between the - answer Upper and lower tube sheets
Vertical firetube boilers have an advantage when___________ is
limited. - answer Floor space
The "A" type boiler is constructed with _________ drums. - answer
three
In general construction the Firebox boiler is not unlike
the____________ boiler. - answer locomotive
A modular cast-iron heating boiler - answer Consists of a number of
horizontal sectional cast-iron boilers
The HRT boiler is classified as a _______ pass boiler. - answer two
,The boilers or modules in a multiple heating boiler plant are: -
answer Most typically connected in parallel between the supply and
return header
The switch in the operating control of a steam boiler is closed by: -
answer Falling steam pressure
A thermocouple consists of two dissimilar wires welded together at
one end to form a: - answer Hot junction
A heating boiler must have a permanently attached marker
indicating: - answer Lowest permissible water level
What is the name given to the component that coordinates and
sequences the boiler operation? - answer Programming controller
On a hot water boiler, the highest value on the graduated scale of
the pressure gauge shall not be less than ______ times the pressure
at which the pressure relief valve is set. - answer 1.5
The programmed startup sequence of oil-fired boilers with no pilot
light is as follows: - answer 1. The operating control closes a switch
2. The load relay energizes the ignition transformer, fuel oil shut-off
valve, and motor driving the air fan and fuel pump
3. The spark from the ignition transformer ignites the main burner
4. The flame detector senses the flame and causes the flame relay
to close5. The ignition transformer is then de-energized
The boiler vent valve is used for the purpose of allowing: - answer
Air to escape while filling
, If for any reason, the burner should go out during normal operation,
or the fuel should fail to ignite during startup: - answer The fuel to
the burner must be shut off immediately
The discharge piping from the relief valve should be piped to a safe
point for disposal and can be: - answer Terminated above a floor
drain
The time taken for the automatic pilot valve to close in the event of
a loss of flame detection is about ______ seconds - answer 10
The boiler firebox, gas passages and chimney should be thoroughly
cleaned by wire brushing and: - answer Vacuuming
Leakage of a few drops a minute leakage from the packing gland of
circulating pumps is desirable to prevent drying out of packing and:
- answer Scoring of the shaft
Boiler explosions may be listed under two general classifications: -
answer Furnace explosions and Pressure explosions
If the water level in a steam boiler is found to be below the gauge
glass, the boiler should be: - answer Shut down immediately
When inspecting the fireside of the boiler the surfaces are examined
for bulges or blisters which would indicate: - answer Overheating
Which of the following is done to prevent excessive stresses of
boiler metal due to uneven expansion? - answer Warm the boiler up
as slowly as possible
The dye penetrant, entrapped in a crack, is brought to the surface
by the action of the: - answer Developer
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