Thermodynamics Online Electronics Test 4 - Mechanical Engineering Test 4

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1. Addition of heat at constant pressure to a gas results in _____.
raising its temperature	raising its pressure
raising its volume	raising its temperature and doing ex-ternal work

2. Carnot cycle has maximum efficiency for ______.
reversible engine	irreversible engine
new engine	petrol engine

3. Measurement of temperature is based on ______.
thermodynamic properties	zeroth law of thermodynamics
first law of thermodynamics	second law of thermodynamics

4. Carnot cycle efficiency depends upon _______.
properties of the medium/substance used	condition of engine
working condition	temperature range of operation

5. Carnot cycle efficiency is maximum when _____.
initial temperature is 0°K	final temperature is 0°K
difference between initial and final temperature is 0°K	final temperature is 0°C

6. 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

7. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
temperature	enthalpy
internal energy	entropy

8. If a system after undergoing a series of processes, returns to the initial state then
process is thermodynamically in equi-librium	process is executed in closed system cycle
its entropy will change due to irre-versibility	sum of heat and work transfer will be zero

9. Which of the following represents the perpetual motion of the first kind (PPM-1)?
engine with 100% thermal efficiency	a fully reversible engine
transfer of heat energy from low temperature source to high tempera¬ture source	a machine that continuously creates its own energy

10. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is ______.
feasible	impossible
possible	possible, but with lot of sophistications

11. 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
justified	not possible
may be possible with lot of sophistications	cost will be very high

12. In a Carnot cycle, heat is transferred at ______.
constant pressure	constant volume
constant temperature	constant enthaply

13. A diathermic wall is one which _______.
prevents thermal interaction	permits thermal interaction
encourages thermal interaction	discourages thermal interaction

14. An adiabatic wall is one which ______.
prevents thermal interaction	permits thermal interaction
encourages thermal interaction	discourages thermal interaction

15. 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.

16. Compressed air coming out from a punctured football
becomes hotter	becomes cooler1
remains at the same temperature	may become hotter or cooler depend-ing upon the humidity of the surrounding air

17. 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

18. During throttling process _______.
heat exchange does not take place	no work is done by expanding steam
there is no change of internal energy of steam	all of the above

19. The energy of molecular motion appears as _____.
heat	potential energy
surface tension	friction

20. A sudden fall in the barometer reading is a sign of approaching
fine weather	rains
storm	cold wave