Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineeringnew exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.
Q1. The heat and mechanical energies are mutually convertible. This statement was established by
(A) Boyle
(B) Charles
(C) Joule
(D) None of these
Answer:(C) Joule
Q2. The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
(A) 0
(B) 1
(C) γ
(D) ∝
Answer: (B) 1
Q3. When the gas is heated at constant pressure, the heat supplied
(A) Increases the internal energy of the gas
(B) Increases the temperature of the gas
(C) Does some external work during expansion
(D) Both (B) and (C)
Answer: (D) Both (B) and (C)
Q4. First law of thermodynamics deals with
(A) Conservation of heat
(B) Conservation of momentum
(C) Conservation of mass
(D) Conservation of energy
Answer: (D) Conservation of energy
Q5. The entropy of water at 0°C is assumed to be
(A) 1
(B) 0
(C) -1
(D) 10
Answer:(B) 0
Q6. Which of the following gas has a minimum molecular mass?
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Methane
Answer: (C) Hydrogen
Q7. A cycle consisting of two constant pressure and two isentropic processes is known as
(A) Carnot cycle
(B) Stirling cycle
(C) Otto cycle
(D) None of these
Answer: (D) None of these
Q8. Which of the following is correct?
(A) Absolute pressure = Gauge pressure + Atmospheric pressure
(B) Gauge pressure = Absolute pressure + Atmospheric pressure
(C) Atmospheric pressure = Absolute pressure + Gauge pressure
(D) Absolute pressure = Gauge pressure – Atmospheric pressure
Answer: (A) Absolute pressure = Gauge pressure + Atmospheric pressure
Q9. The most probable velocity of the gas molecules is given by
(A) √(KT/m)
(B) √(2KT/m)
(C) √(3KT/m)
(D) √(5KT/m)
Answer: (B) √(2KT/m)
Q10. When the gas is cooled at constant pressure,
(A) Its temperature increases but volume decreases
(B) Its volume increases but temperature decreases
(C) Both temperature and volume increases
(D) Both temperature and volume decreases
Answer: (D) Both temperature and volume decreases
Q11. The principal constituents of a fuel are
(A) Carbon and hydrogen
(B) Oxygen and hydrogen
(C) Sulphur and oxygen
(D) Sulphur and hydrogen
Answer: (A) Carbon and hydrogen
Q12. Kelvin-Planck’s law deals with
(A) Conservation of work
(B) Conservation of heat
(C) Conversion of heat into work
(D) Conversion of work into heat
Answer: (C) Conversion of heat into work
Q13. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
(A) Cut-off is increased
(B) Cut-off is decreased
(C) Cut-off is zero
(D) Cut-off is constant
Answer: (C) Cut-off is zero
Q14. When cut-off ratio is __ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
(A) Zero
(B) 1/5
(C) 4/5
(D) 1
Answer: (A) Zero
Q15. The change of entropy, when heat is absorbed by the gas, is
(A) Positive
(B) Negative
(C) Positive or negative
(D) None of these
Answer: (A) Positive
Q16. The heat and work are mutually convertible. This statement is called __ law of thermodynamics.
(A) Zeroth
(B) First
(C) Second
(D) Third
Answer:(B) First
Q17. One kilowatt is equal to
(A) 1 N-m/s
(B) 100 N-m
(C) 1000 N-m/s
(D) 1 × 106 N-m/s
Answer: (C) 1000 N-m/s
Q18. When a gas is heated at constant volume
(A) Its temperature will increase
(B) Its pressure will increase
(C) Both temperature and pressure will increase
(D) Neither temperature nor pressure will increase
Answer: (C) Both temperature and pressure will increase
Q19. The value of cp/cv for air is
(A) 1
(B) 1.4
(C) 1.45
(D) 2.3
Answer: (B) 1.4
Q20. Producer gas is obtained by
(A) Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
(B) Carbonization of bituminous coal
(C) Passing steam over incandescent coke
(D) Passing air and a large amount of steam over waste coal at about 650°C
Answer: (A) Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
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- Mechanical Engineering Thermodynamics – Set 1
- Mechanical Engineering Thermodynamics – Set 2
- Mechanical Engineering Thermodynamics – Set 3
- Mechanical Engineering Thermodynamics – Set 4
- Mechanical Engineering Thermodynamics – Set 5
- Mechanical Engineering Thermodynamics – Set 6
- Mechanical Engineering Thermodynamics – Set 7
- Mechanical Engineering Thermodynamics – Set 8
- Mechanical Engineering Thermodynamics – Set 9
- Mechanical Engineering Thermodynamics – Set 10
- Mechanical Engineering Thermodynamics – Set 11
- Mechanical Engineering Thermodynamics – Set 12
- Mechanical Engineering Thermodynamics – Set 13
- Mechanical Engineering Thermodynamics – Set 14
- Mechanical Engineering Thermodynamics – Set 15
- Mechanical Engineering Thermodynamics – Set 16
- Mechanical Engineering Thermodynamics – Set 17
- Mechanical Engineering Thermodynamics – Set 18
- Mechanical Engineering Thermodynamics – Set 19
- Mechanical Engineering Thermodynamics – Set 20
- Mechanical Engineering Thermodynamics – Set 21
- Mechanical Engineering Thermodynamics – Set 22