Practice Test on Thermodynamics mcq – Set 14

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All questions answers in the last paragraph

Q1. Kinetic theory of gases assumes that the collisions between the molecules are

(A) Perfectly elastic
(B) Perfectly inelastic
(C) Partly elastic
(D) Partly inelastic

Q2. A heat exchange process in which the product of pressure and volume remains constant is known as

(A) Heat exchange process
(B) Throttling process
(C) Isentropic process
(D) Hyperbolic process

Q3. Carnot cycle efficiency depends upon

(A) Properties of the medium/substance used
(B) Condition of engine
(C) Working condition
(D) Temperature range of operation

Q4. Which of the following statement is incorrect?

(A) The liquid fuels have higher calorific value than solid fuels
(B) The solid fuels have higher calorific value than liquid fuels
(C) A good fuel should have low ignition point
(D) The liquid fuels consist of hydrocarbons

Q5. Brayton cycle consists’ of following four processes

(A) Two isothermal and two isentropic
(B) Two isentropic and two constant volumes
(C) Two isentropic, one constant volume and one constant pressure
(D) Two isentropic and two constant pressures

Q6. General gas equation is

(A) PV=nRT
(B) PV=mRT
(C) PV = C

Q7. Universal gas constant is defined as equal to product of the molecular weight of the gas and

(A) Specific heat at constant pressure
(B) Specific heat at constant volume
(C) Ratio of two specific heats
(D) Gas constant

Q8. Compressed air coming out from a punctured football

(A) Becomes hotter
(B) Becomes cooler
(C) Remains at the same temperature
(D) May become hotter or cooler depending upon the humidity of the surrounding air

Q9. The compression ratio for petrol engines is

(A) 3 to 6
(B) 5 to 8
(C) 10 to 20
(D) 15 to 30

Q10. The absolute zero temperature is taken as

(A) 237°C
(B) -273°C
(C) -237°C
(D) 273°C

Q11. One Joule (J) is equal to

(A) 1 kN-m
(B) 1 N-m
(C) 10 kN-m/s
(D) 10 N-m/s

Q12. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

(A) Otto cycle
(B) Stirling cycle
(C) Carnot cycle
(D) Diesel cycle

Q13. Water contained in a beaker can be made to boil by passing steam through it

(A) At atmospheric pressure
(B) At a pressure greater than atmospheric pressure
(C) Any pressure
(D) Not possible

Q14. The efficiency of Carnot cycle is maximum for

(A) Gas engine
(B) Petrol engine
(C) Steam engine
(D) Reversible engine

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

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

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