261. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
less than
equal to
more than
✅ The correct answer is option C.
Thermodynamics MCQs
262. Carbonisation of coal consists of
drying and crushing the coal to a fine powder
moulding the finely ground coal under pressure with or without a binding material
heating the wood with a limited supply of air to temperature not less than 280°C
none of the above
✅ The correct answer is option D.
263. The efficiency of Stirling cycle is __________ Carnot cycle.
greater than
less than
equal to
✅ The correct answer is option C.
264. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
cut-off is increased
cut-off is decreased
cut-off is zero
cut-off is constant
✅ The correct answer is option C.
265. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
flow processes
non-flow processes
adiabatic processes
none of these
✅ The correct answer is option A.
266. An isothermal process is governed by
Boyle’s law
Charles’ law
Gay-Lussac law
Avogadro’s law
✅ The correct answer is option A.
267. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as
reversible cycle
irreversible cycle
thermodynamic cycle
none of these
✅ The correct answer is option C.
268. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
workdone
entropy
enthalpy
none of these
✅ The correct answer is option C.
269. The value of 1 mm of Hg is equal to
1.333 N/m2
13.33 N/m2
133.3 N/m2
1333 N/m2
✅ The correct answer is option C.
270. The compression ratio for petrol engines is
3 to 6
5 to 8
15 to 20
20 to 30
✅ The correct answer is option B.