Power Engineering 4th Class - Unit A2
Review 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 - CORRECT ANSWER✔️✔️-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
b. 407 880 kJ
c. 1774.28 kJ
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,d. 424 627.98 kJ
e. 484 507.6 kJ - CORRECT ANSWER✔️✔️-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 - CORRECT ANSWER✔️✔️-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
c. a Solution
d. an Atom
e. an Element - CORRECT ANSWER✔️✔️-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%?
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,Select one:
a. 3.546
b. 3.845
c. 4.875
d. 5.754
e. 6.854 - CORRECT ANSWER✔️✔️-b
(4-019-1.6) Steam containing water particles in suspension is defined as:
Select one:
a. Dry steam
b. Theoretical steam
c. Wet steam
d. Sub-cooled steam
e. Superheated steam - CORRECT ANSWER✔️✔️-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
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, c. 53 107 kJ
d. 189 756 kJ
e. 273 097 kJ - CORRECT ANSWER✔️✔️-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
c. when glycol is too expensive
d. when high temperature process fluids are needed at low pressure - CORRECT ANSWER✔️✔️-
d
(4-018-4.5) When the temperature of an object is increased, its change in length is proportional to
its:
Select one:
a. Initial length and initial temperature.
b. Cross-sectional area and temperature.
c. Volume and temperature increase.
d. Initial length and temperature increase.
e. Initial temperature, but inversely proportional to its length. - CORRECT ANSWER✔️✔️-d
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
Review 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 - CORRECT ANSWER✔️✔️-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
b. 407 880 kJ
c. 1774.28 kJ
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,d. 424 627.98 kJ
e. 484 507.6 kJ - CORRECT ANSWER✔️✔️-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 - CORRECT ANSWER✔️✔️-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
c. a Solution
d. an Atom
e. an Element - CORRECT ANSWER✔️✔️-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%?
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,Select one:
a. 3.546
b. 3.845
c. 4.875
d. 5.754
e. 6.854 - CORRECT ANSWER✔️✔️-b
(4-019-1.6) Steam containing water particles in suspension is defined as:
Select one:
a. Dry steam
b. Theoretical steam
c. Wet steam
d. Sub-cooled steam
e. Superheated steam - CORRECT ANSWER✔️✔️-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
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
, c. 53 107 kJ
d. 189 756 kJ
e. 273 097 kJ - CORRECT ANSWER✔️✔️-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
c. when glycol is too expensive
d. when high temperature process fluids are needed at low pressure - CORRECT ANSWER✔️✔️-
d
(4-018-4.5) When the temperature of an object is increased, its change in length is proportional to
its:
Select one:
a. Initial length and initial temperature.
b. Cross-sectional area and temperature.
c. Volume and temperature increase.
d. Initial length and temperature increase.
e. Initial temperature, but inversely proportional to its length. - CORRECT ANSWER✔️✔️-d
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
