Engineering Thermodynamics Questions And Answers – Set 27

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All questions answers in the last paragraph

Q1. The process is adiabatic, if the value of n in the equation pvn = C, is

(A) Zero
(B) One
(C) γ
(D) ∝

Q2. High air-fuel ratio in gas turbines

(A) Increases power output
(B) Improves thermal efficiency
(C) Reduces exhaust temperature
(D) Do not damage turbine blades

Q3. Which of the following gas has the highest calorific value?

(A) Coal gas
(B) Producer gas
(C) Mond gas
(D) Blast furnace gas

Q4. The __ is obtained when carbonization of coal is carried out at 500° to 700° C.

(A) Soft coal
(B) Hard coal
(C) Pulverized coal
(D) Bituminous coal

Q5. The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)

(A) (T1/T2) – 1
(B) 1 – (T1/T2)
(C) 1 – (T2/T1)
(D) 1 + (T2/T1)

Q6. The standard value of atmospheric pressure taken at sea level is

(A) 1.013 bar
(B) 760 mm of Hg
(C) 1013 × 102 N/m2
(D) All of these

Q7. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

(A) 0.086
(B) 1.086
(C) 1.086
(D) 4.086

Q8. One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

(A) 800 K
(B) 1000 K
(C) 1200 K
(D) 1400 K

Q9. A molecule consisting of one atom is known as

(A) Mono-atomic
(B) Di-atomic
(C) Tri-atomic
(D) Poly-atomic

Q10. The efficiency of Diesel cycle depends upon

(A) Temperature limits
(B) Pressure ratio
(C) Compression ratio
(D) Cut-off ratio and compression ratio

Q11. The molecular mass expressed in gram (i.e. 1 g – mole) of all gases, at N. T. P., occupies a volume of

(A) 0.224 liters
(B) 2.24 liters
(C) 22.4 liters
(D) 224 liters

Q12. One molecule of oxygen consists of __ atoms of oxygen.

(A) 2
(B) 4
(C) 8
(D) 16

Q13. According to Kelvin-Planck’s statement, a perpetual motion of the __ is impossible.

(A) First kind
(B) Second kind
(C) Third kind
(D) None of these

Q14. The unit of energy is S. I. units is

(A) Joule (J)
(B) Joule meter (Jm)
(C) Watt (W)
(D) Joule/meter (J/m)

Q15. One kg of carbon monoxide requires __ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

(A) 4/7
(B) 11/4
(C) 9/7
(D) All of these

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