POWER ENGINEERING 4TH CLASS -
UNIT A2 REVIEW EXAM 2025
QUESTIONS AND ANSWERS
(4-096-1.1) Large areas, such as warehouses, are usually heated by:
Select one:
a. Unit heaters
b. Radiators
c. Convectors
d. Open heaters
e. Space heaters - ANS a
(4-019-3.8) How much heat must be supplied to 200 kg of water at 20°C to make steam at 850
kPa abs and 87% dry?
Select one:
a. 2039.4 kJ
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,b. 407 880 kJ
c. 1774.28 kJ
d. 424 627.98 kJ
e. 484 507.6 kJ - ANS e
(4-018-2.6) Convert -6°C to °F.
Select one:
a. 30.4°F
b. 28.5°F
c. 21.2°F
d. 18.6°F
e. 16.7°F - ANS c
(4-020-3.2) A substance that cannot be decomposed into other substances by chemical means
is:
Select one:
a. a Mixture
b. a Compound
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,c. a Solution
d. an Atom
e. an Element - ANS e
(4-019-3.4) A boiler furnace releases 10 400 kJ of heat for each kg of fuel burned and produces
dry saturated steam at 14 000 kPa abs. from feedwater at 200°C. How many kg of steam will be
produced for each kg of fuel burned if the boiler has an efficiency of 66%?
Select one:
a. 3.546
b. 3.845
c. 4.875
d. 5.754
e. 6.854 - ANS b
(4-019-1.6) Steam containing water particles in suspension is defined as:
Select one:
a. Dry steam
b. Theoretical steam
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, c. Wet steam
d. Sub-cooled steam
e. Superheated steam - ANS c
(4-019-1.3) How much heat must be absorbed by 63 kg of ice at 0°C to convert it to saturated
steam at 100°C. Specific heat of water is 4.2 kJ/kg K. Latent heat of fusion of ice is 335 kJ/kg.
Latent heat of evaporation of steam is 2257 kJ/kg.
Select one:
a. 35 490 kJ
b. 21 775 kJ
c. 53 107 kJ
d. 189 756 kJ
e. 273 097 kJ - ANS d
When is hot oil an ideal heat transfer fluid?
Select one:
a. when high temperature, high pressure process fluids are needed
b. when low temperature process fluids are needed at high pressure
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UNIT A2 REVIEW EXAM 2025
QUESTIONS AND ANSWERS
(4-096-1.1) Large areas, such as warehouses, are usually heated by:
Select one:
a. Unit heaters
b. Radiators
c. Convectors
d. Open heaters
e. Space heaters - ANS a
(4-019-3.8) How much heat must be supplied to 200 kg of water at 20°C to make steam at 850
kPa abs and 87% dry?
Select one:
a. 2039.4 kJ
COPYRIGHT © 2025 FYNDLAY ALL RIGHTS RESERVED 1
,b. 407 880 kJ
c. 1774.28 kJ
d. 424 627.98 kJ
e. 484 507.6 kJ - ANS e
(4-018-2.6) Convert -6°C to °F.
Select one:
a. 30.4°F
b. 28.5°F
c. 21.2°F
d. 18.6°F
e. 16.7°F - ANS c
(4-020-3.2) A substance that cannot be decomposed into other substances by chemical means
is:
Select one:
a. a Mixture
b. a Compound
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,c. a Solution
d. an Atom
e. an Element - ANS e
(4-019-3.4) A boiler furnace releases 10 400 kJ of heat for each kg of fuel burned and produces
dry saturated steam at 14 000 kPa abs. from feedwater at 200°C. How many kg of steam will be
produced for each kg of fuel burned if the boiler has an efficiency of 66%?
Select one:
a. 3.546
b. 3.845
c. 4.875
d. 5.754
e. 6.854 - ANS b
(4-019-1.6) Steam containing water particles in suspension is defined as:
Select one:
a. Dry steam
b. Theoretical steam
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, c. Wet steam
d. Sub-cooled steam
e. Superheated steam - ANS c
(4-019-1.3) How much heat must be absorbed by 63 kg of ice at 0°C to convert it to saturated
steam at 100°C. Specific heat of water is 4.2 kJ/kg K. Latent heat of fusion of ice is 335 kJ/kg.
Latent heat of evaporation of steam is 2257 kJ/kg.
Select one:
a. 35 490 kJ
b. 21 775 kJ
c. 53 107 kJ
d. 189 756 kJ
e. 273 097 kJ - ANS d
When is hot oil an ideal heat transfer fluid?
Select one:
a. when high temperature, high pressure process fluids are needed
b. when low temperature process fluids are needed at high pressure
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