Questions and answers for exam Preparation

MCQs

Laws Of Thermodynamics

Total Questions : 1462 | Page 141 of 147 pages

Question 1401. One barometric pressure or 1 atmospheric pressure is equal to___________________?

1 kgf/cnr2
1.033 kgf/cm2
0 kgf/cm2
1.0197 kgf/cm2
100 kgf/cm2

Discuss Question

Answer: Option B. -> 1.033 kgf/cm2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1402. Water contained in a beaker can be made to boil by passing steam through it__________________?

at atmospheric pressure
at a pressure below the firuosphejric pressure
at a pressure greater than atmospheric pressure
any pressure
not possible

Discuss Question

Answer: Option C. -> at a pressure greater than atmospheric pressure
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1403. The door of a running refrigerator inside a room was left open____________________?
Which of the following statements is correct ?

The room will be cooled to the temperature inside the refrigerator
The room will be cooled very slightly
The room will be gradually warmed up
The temperature of the air in room will remain unaffected
any one of above is possible depending on the capacity

Discuss Question

Answer: Option C. -> The room will be gradually warmed up
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1404. A diathermic wall is one which____________________?

prevents thermal interaction
permits thermal interaction
encourages thermal interaction
discourages thermal interaction
does not exist

Discuss Question

Answer: Option B. -> permits thermal interaction
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1405. Carnot cycle efficiency depends upon________________?

properties of the medium/substance used
condition of engine
working condition
temperature range of operation
effectiveness of insulating material around the engine

Discuss Question

Answer: Option D. -> temperature range of operation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1406. An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be________________?

650°K
600°K
625°K
700°K
750°K

Discuss Question

Answer: Option A. -> 650°K
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1407. According to first law of thermodynamics_______________________?

mass and energy are mutually convertible
Carnot engine is most efficient
heat and work are mutually convertible
mass and light are mutually convertible
heat flows from hot substance to cold substance

Discuss Question

Answer: Option C. -> heat and work are mutually convertible
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1408. If a system after undergoing a series of processes, returns to the initial state then__________________?

process is thermodynamically in equilibrium
process is executed in closed system cycle
its entropy will change due to irreversibility
sum of heat and work transfer will be zero
no work will be done by the system

Discuss Question

Answer: Option D. -> sum of heat and work transfer will be zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1409. Carnot cycle has maximum efficiency for__________________?

reversible engine
irreversible engine
new engine
petrol engine
diesel engine

Discuss Question

Answer: Option A. -> reversible engine
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1410. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is__________________?