Power engineering 5th class Questions and Answers: Tie Rods
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Course
Power engineering
Institution
Power Engineering
Power engineering 5th class Questions and Answers: Tie Rods
Cast-iron sectional boilers have flue gas passages which - ANS Increase heat transfer
Steel plate heating boilers have thin steel installed in the - ANS Firetubes to give the gases a swirling motion
The vertical firetube boile...
Power engineering 5th class Questions
and Answers: Tie Rods
Cast-iron sectional boilers have flue gas passages which - ANS Increase heat transfer
Steel plate heating boilers have thin steel installed in the - ANS Firetubes to give the
gases a swirling motion
A
The vertical firetube boiler has a cylindrical shell with tubes connected between the -
ANS Upper and lower tube sheets
VI
Vertical firetube boilers have an advantage when___________ is limited. - ANS Floor
space
TU
The "A" type boiler is constructed with _________ drums. - ANS three
In general construction the Firebox boiler is not unlike the____________ boiler. - ANS
IS
locomotive
A modular cast-iron heating boiler - ANS Consists of a number of horizontal sectional
OM
cast-iron boilers
The HRT boiler is classified as a _______ pass boiler. - ANS two
The boilers or modules in a multiple heating boiler plant are: - ANS Most typically
NA
connected in parallel between the supply and return header
The switch in the operating control of a steam boiler is closed by: - ANS Falling steam
pressure
JP
A thermocouple consists of two dissimilar wires welded together at one end to form a: -
ANS Hot junction
A heating boiler must have a permanently attached marker indicating: - ANS Lowest
permissible water level
What is the name given to the component that coordinates and sequences the boiler
operation? - ANS 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. - ANS 1.5
The programmed startup sequence of oil-fired boilers with no pilot light is as follows: -
ANS 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
A
4. The flame detector senses the flame and causes the flame relay to close5. The
ignition transformer is then de-energized
VI
The boiler vent valve is used for the purpose of allowing: - ANS Air to escape while
filling
TU
If for any reason, the burner should go out during normal operation, or the fuel should
fail to ignite during startup: - ANS The fuel to the burner must be shut off immediately
IS
The discharge piping from the relief valve should be piped to a safe point for disposal
and can be: - ANS Terminated above a floor drain
OM
The time taken for the automatic pilot valve to close in the event of a loss of flame
detection is about ______ seconds - ANS 10
The boiler firebox, gas passages and chimney should be thoroughly cleaned by wire
brushing and: - ANS Vacuuming
NA
Leakage of a few drops a minute leakage from the packing gland of circulating pumps is
desirable to prevent drying out of packing and: - ANS Scoring of the shaft
Boiler explosions may be listed under two general classifications: - ANS Furnace
JP
explosions and Pressure explosions
If the water level in a steam boiler is found to be below the gauge glass, the boiler
should be: - ANS Shut down immediately
When inspecting the fireside of the boiler the surfaces are examined for bulges or
blisters which would indicate: - ANS Overheating
, Which of the following is done to prevent excessive stresses of boiler metal due to
uneven expansion? - ANS 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: -
ANS Developer
The boiler certificate of inspection: - ANS Should be conspicuously placed adjacent to
the boiler or retained and safeguarded in a manner approved by the inspector
With reference to Power Engineering the letters "SIAP" mean: - ANS Sense, Interpret,
A
Analyze, Perform
VI
Hydrostatic testing of a boiler requires that the pressure be raised to ___________ the
Maximum Allowable Working Pressure stamped on the boiler. - ANS 1.5 times
TU
An intermittent pilot: - ANS Is automatically ignited at the start of each burner
operation and continues to burn throughout the main burner period
Upon activation the two-way pilot valve in the diaphragm gas valve switches so that the:
IS
- ANS Supply port closes and the bleed port opens
Air is composed of mostly: - ANS Nitrogen
OM
The oil is supplied to the burner mechanical atomizing nozzle under high pressure of
about: - ANS 700 kPa (100 psi)
The pump type motorized gas valve uses a hydraulic oil pump to: - ANS Open the gas
NA
valve slowly
Too much excess air will cause: - ANS Large amounts of heat out through the stack
Viscosity is a measure of the ____________________ of the oil. - ANS Internal
JP
resistance to flow
An advantage of a refractory burner is: - ANS The short luminous flame spreads over
a large cross-section of the furnace resulting in high radiant heat transfer
The average heating value of coal (bituminous) is: - ANS 25 600 kJ/kg (11,000 Btu/lb)
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