Engineering Thermodynamics Questions And Answers – Set 21

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All questions answers in the last paragraph

Q1. The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

(A) 1 – rγ – 1
(B) 1 + rγ – 1
(C) 1 – (1/ rγ – 1)
(D) 1 + (1/ rγ – 1)

Q2. Mond 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

Q3. Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

(A) cv/ cp =R
(B) cp – cv = R
(C) cv = R/ γ-1
(D) Both (B) and (C)

Q4. According to Regnault’s law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _ with the change in pressure and temperature of the gas.

(A) Change
(B) Do not change
(C) Both (A) and (B)
(D) None of these

Q5. The mass of carbon per kg of flue gas is given by

(A) (11/3) CO2 + (3/7) CO
(B) (3/7) CO2 + (11/3) CO
(C) (7/3) CO2 + (3/11) CO
(D) (3/11) CO2 + (7/3) CO

Q6. Petrol is distilled at

(A) 65° to 220°C
(B) 220° to 345°C
(C) 345° to 470°C
(D) 470° to 550°C

Q7. Which of the following gas has a minimum molecular mass?

(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Methane

Q8. 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

Q9. 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

Q10. Which of the following has the minimum atomic mass?

(A) Oxygen
(B) Sulphur
(C) Nitrogen
(D) Carbon

Q11. One kg of carbon monoxide requires 4/7 kg of oxygen and produces

(A) 11/3 kg of carbon dioxide gas
(B) 7/3 kg of carbon monoxide gas
(C) 11/7 kg of carbon dioxide gas
(D) 8/3 kg of carbon monoxide gas

Q12. The efficiency of Diesel cycle increases with

(A) Decrease in cut-off
(B) Increase in cut-off
(C) Constant cut-off
(D) None of these

Q13. The atomic mass of sulphur is

(A) 12
(B) 14
(C) 16
(D) 32

Q14. The general gas energy equation is (where Q1 – 2 = Heat supplied, dU = Change in internal energy, and W1 – 2 = Work done in heat units)

(A) Q1 – 2 = dU + W1 – 2
(B) Q1 – 2 = dU – W1 – 2
(C) Q1 – 2 = dU/W1 – 2
(D) Q1 – 2 = dU × W1 – 2

Q15. A tri-atomic molecule consists of __ atoms.

(A) One
(B) Two
(C) Three
(D) Four

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