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4th Class Power Engineering Part A Exam (NEW UPDATED VERSION)
LATEST ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED
QUESTIONS AND ANSWERS)- GUARANTEED PASS A+ UPDATED
4TH CLASS POWER ENGINEERING –
PART A
PRACTICE EXAM
1.
Which unit is used to measure pressure?
A. Joule
B. Watt
C. Pascal
D. Newton
Answer: C
Rationale: Pressure is force per unit area and is measured in Pascals (Pa).
2.
What is the formula for density?
A. Mass × Volume
B. Mass ÷ Volume
C. Volume ÷ Mass
D. Weight ÷ Area
Answer: B
Rationale: Density = mass / volume.
2026 2027 GRADED A+
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3.
What happens to pressure when temperature increases in a sealed container?
A. Decreases
B. Remains constant
C. Increases
D. Becomes zero
Answer: C
Rationale: According to Gay-Lussac’s Law, pressure increases with temperature at constant
volume.
4.
Which temperature scale starts at absolute zero?
A. Celsius
B. Fahrenheit
C. Kelvin
D. Rankine
Answer: C
Rationale: Kelvin scale begins at absolute zero.
5.
What is the boiling point of water at atmospheric pressure?
A. 90°C
B. 100°C
C. 110°C
D. 212°C
Answer: B
Rationale: Water boils at 100°C at 101.3 kPa.
6.
Which law states that pressure and volume are inversely proportional?
2026 2027 GRADED A+
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A. Charles’ Law
B. Boyle’s Law
C. Dalton’s Law
D. Avogadro’s Law
Answer: B
Rationale: Boyle’s Law applies at constant temperature.
7.
Which unit measures energy?
A. Newton
B. Pascal
C. Joule
D. Watt
Answer: C
Rationale: Energy is measured in joules.
8.
What is the formula for work?
A. Force ÷ Distance
B. Pressure × Volume
C. Force × Distance
D. Mass × Acceleration
Answer: C
Rationale: Work = Force × Distance.
9.
Which substance has the highest specific heat?
A. Steam
B. Oil
C. Air
D. Water
2026 2027 GRADED A+
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Answer: D
Rationale: Water has a very high specific heat capacity.
10.
What happens to liquid viscosity as temperature increases?
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero
Answer: B
Rationale: Liquids become less viscous when heated.
11.
Which type of heat transfer requires direct contact?
A. Radiation
B. Convection
C. Conduction
D. Evaporation
Answer: C
Rationale: Conduction transfers heat through direct molecular contact.
12.
Which unit measures power?
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: B
Rationale: Power is the rate of doing work, measured in watts.
2026 2027 GRADED A+
4th Class Power Engineering Part A Exam (NEW UPDATED VERSION)
LATEST ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED
QUESTIONS AND ANSWERS)- GUARANTEED PASS A+ UPDATED
4TH CLASS POWER ENGINEERING –
PART A
PRACTICE EXAM
1.
Which unit is used to measure pressure?
A. Joule
B. Watt
C. Pascal
D. Newton
Answer: C
Rationale: Pressure is force per unit area and is measured in Pascals (Pa).
2.
What is the formula for density?
A. Mass × Volume
B. Mass ÷ Volume
C. Volume ÷ Mass
D. Weight ÷ Area
Answer: B
Rationale: Density = mass / volume.
2026 2027 GRADED A+
,2|Page
3.
What happens to pressure when temperature increases in a sealed container?
A. Decreases
B. Remains constant
C. Increases
D. Becomes zero
Answer: C
Rationale: According to Gay-Lussac’s Law, pressure increases with temperature at constant
volume.
4.
Which temperature scale starts at absolute zero?
A. Celsius
B. Fahrenheit
C. Kelvin
D. Rankine
Answer: C
Rationale: Kelvin scale begins at absolute zero.
5.
What is the boiling point of water at atmospheric pressure?
A. 90°C
B. 100°C
C. 110°C
D. 212°C
Answer: B
Rationale: Water boils at 100°C at 101.3 kPa.
6.
Which law states that pressure and volume are inversely proportional?
2026 2027 GRADED A+
,3|Page
A. Charles’ Law
B. Boyle’s Law
C. Dalton’s Law
D. Avogadro’s Law
Answer: B
Rationale: Boyle’s Law applies at constant temperature.
7.
Which unit measures energy?
A. Newton
B. Pascal
C. Joule
D. Watt
Answer: C
Rationale: Energy is measured in joules.
8.
What is the formula for work?
A. Force ÷ Distance
B. Pressure × Volume
C. Force × Distance
D. Mass × Acceleration
Answer: C
Rationale: Work = Force × Distance.
9.
Which substance has the highest specific heat?
A. Steam
B. Oil
C. Air
D. Water
2026 2027 GRADED A+
, 4|Page
Answer: D
Rationale: Water has a very high specific heat capacity.
10.
What happens to liquid viscosity as temperature increases?
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero
Answer: B
Rationale: Liquids become less viscous when heated.
11.
Which type of heat transfer requires direct contact?
A. Radiation
B. Convection
C. Conduction
D. Evaporation
Answer: C
Rationale: Conduction transfers heat through direct molecular contact.
12.
Which unit measures power?
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: B
Rationale: Power is the rate of doing work, measured in watts.
2026 2027 GRADED A+
