21
A perpetual motion machine is
A)
A thermodynamic machine
B)
A non-thermodynamic machine
C)
A hypothetical machine
D)
A hypothetical machine whose operation would violate the laws of thermodynamics
Answer & Solution
Answer: Option
D
22
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
A)
O2 , N2 , steam, CO2
B)
O2 , N2 , water vapour
C)
SO2 , NH3 , CO2 , moisture
D)
O2 , N2 , H2 , air
Answer & Solution
Answer: Option
D
23
In order that a cycle be reversible, following must be satisfied
A)
Free expansion or friction resisted expansion/compression process should not be encountered
B)
When heat is being absorbed, temperature of hot source and working substance should be same
C)
When beat is being rejected, temperature of cold source and working substance should be same
D)
All of the above
Answer & Solution
Answer: Option
D
24
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
Answer & Solution
Answer: Option
D
25
Which law states that the internal energy of a gas is a function of temperature?
A)
Charles' law
B)
Joule's law
C)
Boyle's law
D)
There is no such law
Answer & Solution
Answer: Option
B
26
The term N.T.P. stands for
A)
Nominal temperature and pressure
B)
Natural temperature and pressure
C)
Normal temperature and pressure
D)
Normal thermodynamic practice
Answer & Solution
Answer: Option
C
27
First law of thermodynamics deals with
A)
Conservation of heat
B)
Conservation of momentum
C)
Conservation of mass
D)
Conservation of energy
Answer & Solution
Answer: Option
D
28
The value of n = 1 in the polytropic process indicates it to be
A)
Reversible process
B)
Isothermal process
C)
Adiabatic process
D)
Irreversible process
Answer & Solution
Answer: Option
B
29
The general gas energy equation is (where $${{\text{Q}}_{1 - 2}}$$ = Heat supplied, dU = Change in internal energy and $${{\text{W}}_{1 - 2}}$$ = Work done in heat units)
A)
$${{\text{Q}}_{1 - 2}} = {\text{dU}} + {{\text{W}}_{1 - 2}}$$
B)
$${{\text{Q}}_{1 - 2}} = {\text{dU}} - {{\text{W}}_{1 - 2}}$$
C)
$${{\text{Q}}_{1 - 2}} = \frac{{{\text{dU}}}}{{{{\text{W}}_{1 - 2}}}}$$
D)
$${{\text{Q}}_{1 - 2}} = {\text{dU}} \times {{\text{W}}_{1 - 2}}$$
Answer & Solution
Answer: Option
A
30
Otto 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
Answer & Solution
Answer: Option
B
