THERMAL SCIENCES FOR CIVIL ENGINEERING
NAME--------------------------------------NUMBER-----------------------------------NOTE:- JUST TICK THE CORRECT ANSWER.DO NOT TICK TWO ANSWERS
(1) A definite area or space where some thermodynamic process takes place is
called.
(a) thermodynamic cycle (b) thermodynamic process (c) thermodynamic system
(d) isolated system
(2) When neither mass nor the energy crosses the boundaries of the system the
system is called
(a) closed system (b) open system (c) isolated system (d) insulated system
(2) When both mass and energy crosses the boundaries of the system the system
is called
(a) closed system (b) open system (c) isolated system (d) insulated system
(2) When only energy crosses the boundaries of the system the system is called
(a) closed system (b) open system (c) isolated system (d) insulated system
(3) Which of the following is the extensive property of a system
(a) pressure (b) volume (c) temperature (d) density
(4) Which of the following is an intensive property of the system
(a) volume (b) energy (c) mass (d) temperature
(5) Which of the following is not the property of the system
(a) pressure (b) temperature(c) specific volume (d) heat
(6) When a group of processes is performed on system in such a manner that
initial and final state of the system is the same then system is said to have
undergone
(a) path (b) process (c) thermodynamic cycle (d) mechanical cycle
(7) When no unbalanced force is present with in a system the system is in
(a) Mechanical equilibrium (b) Thermal equilibrium(c) chemical equilibrium(d) phase equilibrium
(8) When no temperature difference is present with in a system the system is in
(a) Mechanical equilibrium (b) Thermal equilibrium(c) chemical equilibrium(d) phase equilibrium
(9) When there is no chemical reaction taking place with in a system the system
is in
(a) Mechanical equilibrium (b) Thermal equilibrium(c) chemical equilibrium(d) phase equilibrium
(10) Atmospheric pressure is equal to
(a) 1.013 kbar (b) 101.013 kN/m2 (c) 105 bar (d) 1 Mpa
(11) Absolute temperature for 100C is
(a) 283 K (b) 263 K (c) 2730 K (d) 273.10 K
(12) Gage pressure s equal to
(a) Atmospheric pressure + absolute pressure (b) Atmospheric pressure - absolute pressure (c) Absolute
pressure +atmospheric pressure (d) Absolute pressure- atmospheric pressure
(13) First law of thermodynamics deals with
(a) conservation of mass (b) conservation of heat (c) conservation of momentum
(d) Conservation of angular momentum (e) conservation of energy
(14) The perfect gas equation is
(a) PV= RT (b) PV = mRT (c) P= vRT (d) Pv= mRT
(15) The value of gas constant for air is
(a) 287 J/kg-K (b) 287 kJ/kg-K (c) 0.287 J/kg-K (d) 0.0287 kJ/kg-K
(16) The value of universal gas constant is
(a) 8314 kJ/kg-k (b) 8.314 kJ/kg-K (c) 8.314 J/kg-K (d) 831.4J/kg-K
(13) Which of the following relations is correct
(a) Cp-Cv = R (b) Cp+Cv =R (c) Cp/Cv =R (d) Cp*Cv =R
(14) Which of the following relations is correct
(a) Cp*Cv = k (b) Cv/Cp =k (c) Cp/Cv =k (d) Cv*Cp =k
(15) The dryness fraction or quality of steam is given as
(a) x 
h  hf
h fg
(b) x 
v  vf
v g v f
(c ) x 
u uf
ug  u f
(d ) x 
h  hf
hg  h f
(16) A process in which temperature remains constant is called
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(17) A process in which pressure remains constant is called
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(18) A process in which volume remains constant is called
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(19) A process in which entropy remains constant is called
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(20) A process in which enthalpy remains constant is called
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(21) A process in which no heat transfer takes place is called
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(21) Boundary work is zero in
(a) open system (b) closed system (c)isolated system
(224) The flow work is not equal to zero in
(a) open system (b) closed system (c)isolated system
(223) Heat and work are
(a) energy in transition (b) storable energies (c) intensive properties (d) extensive properties
(22) Throttling process is an
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process (e) adiabatic
process (f) isenthalpic process
(23) When a process takes place according to law Pvn= constant, the process is
called
(a) isobaric process (b) isothermal process (c) adiabatic process (d) polytropic process
(24) When a process takes place according to law Pvκ = constant, the process is
called
(a) isobaric process (b) isothermal process (c) adiabatic process (d) polytropic process
(25) When a process takes place according to law Pvκ = constant and is
reversible, the process is called
(a) isobaric process (b) isothermal process (c) adiabatic process (d) polytropic process
(26) Which of the system given below is not an example of open system.
(a) turbine (b) pump(c) compressor (d) nozzle (e) piston and cylinder(f) heat exchanger
THERMAL SCIENCES FOR CIVIL ENGINEERING
NAME--------------------------------------NUMBER-----------------------------------NOTE:- JUST TICK THE CORRECT ANSWER.DO NOT TICK TWO ANSWERS
(1) The heat addition in Otto cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(2) The heat addition in a Diesel cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(3) The heat addition in Brayton cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(4) The heat addition in Rankine cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(5) The heat addition in reverse Rankine process takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(6) The heat rejection in Otto cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(7) The heat rejection in a Diesel cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(8) The heat rejection in Brayton cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(9) The heat rejection in Rankine cycle takes place during
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(10) The heat rejection in reverse Rankine process takes place during
a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(11) The work output in Otto cycle occurs in an expansion process which is an
(a) Isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(12) The work output in Diesel cycle occurs in an expansion process which is an
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(13)The work output in Brayton cycle occurs in an expansion process which is an
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(14)The work output in Rankine cycle occurs in an expansion process which is an
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(15) The work input in reverse Rankine cycle occurs in a compression process
which is an
(a) isentropic process (b) isochoric process (c) isobaric process (d) isothermal process
(e) adiabatic process (f) isenthalpic process
(16) If P1, v1 and P2, v2 are pressure and specific volume at the beginning and at
the end of compression process in Otto cycle then compression ratio r is given by
(a) v1/v2 (b) v2/v1 (c) P2/P1 (d) P1 /P2
(17) If P1, v1 and P2, v2 are pressure and specific volume at the beginning and at
the end of pressure process in Brayton cycle then pressure ratio rp is given by
(a) v1/v2 (b) v2/v1 (c) P2/P1 (d) P1 /P2
(18) If P1, v1 and P2, v2 are pressure and specific volume at the beginning and at
the end of compression process in Diesel cycle then compression ratio r is given
by
(a) v1/v2 (b) v2/v1 (c) P2/P1 (d) P1 /P2
(19) If v1, v2, v3, and v4 are the specific volume at the beginning of four process
of Diesel Cycle then cutoff ratio rc is given as
(a) v1/v2 (b) v2/v1 (c) v2/v3 (d) v3/v2 (e) v3/v4 (f) v4/v3 (g) v1/v4 (h) v4/v1
(20) The efficiency of an Ideal Standard Otto cycle is given as
(a)  1 
1
r
(b)  1 
k 1
1  rck  1 
1

(c)  1  ( k 1)
k 1 

r  k (rc  1) 
r k
p
(21) The efficiency of an Ideal Standard Diesel cycle is given as
1  rck  1 
1
(c)  1  ( k 1)
(a)  1  k 1 (b)  1  k 1 

r
r  k (rc  1) 
r k
1
p
(22) The efficiency of an Ideal Standard Brayton cycle is given as
(a)  1 
1
r
(b)  1 
k 1
1  rck  1 
1

(c)  1  ( k 1)
k 1 

r  k (rc  1) 
r k
p
(24) The working fluid entering the pump in the ideal Rankine cycle is as
(a) saturated liquid (b) compressed liquid (c) mixture of liquid and vapor (d) saturated vapor (e)
superheated vapor
(27) The working fluid entering the compressor in the ideal reverse Rankine
cycle is as
(a) saturated liquid (b) compressed liquid (c) mixture of liquid and vapor (d) saturated vapor (e)
superheated vapor
(28) The law of heat transfer by conduction is called
(a) Fourier`s law (b) Newton`s law of cooling (c) Boyle`s law (d) Charle`s law (e) Stefan Boltzman law
(29) The law of heat transfer by convection is called
(a) Fourier`s law (b) Newton`s law of cooling (c) Boyle`s law (d) Charle`s law (e) Stefan Boltzman law
(30) The law of heat transfer by radiation is called
(a) Fourier`s law (b) Newton`s law of cooling (c) Boyle`s law (d) Charle`s law (e) Stefan Boltzman law
(31) The thermal resistance in conduction for a wall of heat transfer area A,
thermal conductivety K and thickness Δx is given as
(a ) RT 
x
K
A
(b) RT 
(c) RT 
KA
x  A
K  x
(32) The thermal resistance in convection from a wall of heat transfer area A,
thermal conductivety K, heat transfer coefficeint h and thickness Δx is given as
(a ) RT 
1
h
A
(b) RT  hA(c) RT  (d ) RT 
hA
A
h
(33) Which of the relations is Fourier`s law of heat conduction
k * A * T
k * A * x
$
(a)Q 
(b)Q 
(c)Q  h * A * T (d )Q  A(Ts4  Tsur
)
x
T
(34) Which of the relations is Newton`s law of cooling
k * A * T
k * A * x
$
(a)Q 
(b)Q 
(c)Q  h * A * T (d )Q  A(Ts4  Tsur
)
x
T
(35) Which of the relations is Stefan Boltzman law of heat Radiation
k * A * T
k * A * x
$
(a)Q 
(b)Q 
(c)Q  h * A * T (d )Q  A(Ts4  Tsur
)
x
T
(36) The units of coefficeint of thermal conductivity is
(a) W/m-0C (b)W/m2-0C(c)W/0C(d)0C/W
(37) The units of coefficeint of heat transfer coefficeint is
(a) W/m-0C (b)W/m2-0C(c)W/0C(d)0C/W
(38) The units of coefficeint of thermal resistance is
(a) W/m-0C (b)W/m2-0C(c)W/0C(d)0C/W
THERMAL SCIENCES FOR CIVIL ENGINEERING
NAME--------------------------------------NUMBER-----------------------------------NOTE:- JUST TICK THE CORRECT ANSWER.DO NOT TICK TWO ANSWERS
(1) The entropy change during a process is given as
(a) dS = δQ/T (b) dS =δQ*T (c) dS = T/δQ (d) dS = T*δQ
(2) The heat transferred during a process is given as
(a) δQ=T*dS (b)δQ=dT*dS (c) δQ=dT+dS (d) δQ=T/dS
(3) Second law of thermodynamics defines
(a) heat (b) work (c) internal energy (d) entropy
(4) The efficiency of a Carnot Engine working between TH and TL is given as
(a)η = 1- TL /TH (b)) η = 1+ TL /TH (c)) η = 1- TH/TL (d)) η = 1+ TH /TL
(5) The C.O.P of Carnot refrigerator working between TH and TL is given as
(a)C.O.P 
1
TH
1
TL
(b)C.OP 
1
TL
1
TH
(c)C.O.P 
1
1
(d )C.O.P 
T
T
1 L
1 H
TH
TL
(6) The C.O.P of Carnot heat pump working between TH and TL is given as
(a)C.O.P 
1
TH
1
TL
(b)C.OP 
1
TL
1
TH
(c)C.O.P 
1
1
(d )C.O.P 
T
T
1 L
1 H
TH
TL
(7) The efficiency of an engine is given as
(a)  1 
QL
Q
Q
Q
(b)1  H (c)1  L (d )1  H
QH
QL
QH
QL
(8) The C.O.P of refrigerator is given as
(a)C.O.P 
1
QH
1
QL
(b)C.OP 
1
QL
1
QH
(9) The C.O.P of heat pump is given as
(c)C.O.P 
1
1
(d )C.O.P 
Q
Q
1 L
1 H
QH
QL
(a)C.O.P 
1
QH
1
QL
1
(b)C.OP 
QL
1
QH
(c)C.O.P 
1
1
(d )C.O.P 
Q
Q
1 L
1 H
QH
QL
(10) The entropy change in a process is given by
(a )S  C p ln
T2
P
T
P
 R ln 2 (b)S  C p ln 2  R ln 2
T1
P1
T1
P1
(c)S  C p ln
T1
P
T
P
 R ln 1 (d )S  C p ln 1  R ln 1
T2
P2
T2
P2
(11) The entropy change in a process is given by
(a )S  C v ln
T2
v
T
v
 R ln 2 (b)S  C v ln 2  R ln 2
T1
V1
T1
v1
(c)S  C v ln
T1
v
T
v
 R ln 1 (d )S  C v ln 1  R ln 1
T2
V2
T2
v2
(13) The relation between temperature and pressure in an isentropic process is
(a)
T2  P2 
 
T1  P1 
k 1
k
(b)
T2  P1 
 
T1  P2 
k 1
k
(c )
T2  P2 
 
T1  P1 
k
k 1
(d )
T2  P1 
 
T1  P2 
k
k 1
(14) The relation between temperature and volume in an isentropic process is
v 
T
(a) 2   2 
T1  v1 
k 1
k
v 
T
(b) 2   1 
T1  v 2 
k 1
v 
T
(c) 2   2 
T1  v1 
k 1
k
 v  k 1
T
(d ) 2   1 
T1  v 2 
(15) The actual enthalpy change in a turbine is
(a) more than that in an isentropic process (b) less than that in an isentropic process (c) equal to that in
an isentropic process
(16) The actual enthalpy change in a compressor is
(a) more than that in an isentropic process (b) less than that in an isentropic process (c) equal to that in
an isentropic process
(17) The efficeincy of a compressor which compresses a gas from state 1 to sate 2
is given be
(a) c 
h2 s  h1
h  h2 s
h h
h  h2
(b)c  2 1 (c) c  1
(d )c  1
h2  h1
h2 s  h1
h1  h2
h1  h2 s
(18)The efficeincy of a turbine which expands a gas from state 1 to sate 2 is given
be
(a)t 
h2 s  h1
h  h2 s
h h
h  h2
(b)t  2 1 (c)t  1
(d )t  1
h2  h1
h2 s  h1
h1  h2
h1  h2 s
(19)The efficeincy of a compressor which compresses a gas from state 1 to sate 2
is given be
k 1
 P2  k
P 
   1
1   1 
P
 P2 
(a) c   1 
(b) c 
T2
T
1
1 1
T1
T2
k 1
k
P 
1   2 
 P1 
c) c 
T
1 2
T1
k 1
k
k 1
 P1  k
   1
P
d ) c   2 
T1
1
T2
(20)The efficeincy of a turbine which expands a gas from state 1 to sate 2 is given
be
k 1
 P2  k
P 
   1
1   1 
P
 P2 
(a ) t   1 
(b) t 
T2
T
1
1 1
T1
T2
k 1
k
1
c) t 
T2
T1
P 
1   2 
 P1 
1
k 1
k
d ) t 
T1
T2
P 
1   1 
 P2 
k 1
k
(21) The relation between pressure and volume in an isentropic process is
P v 
(a) 2   2 
P1  v1 
k 1
k
P v 
(b) 2   1 
P1  v 2 
k 1
P v 
(c) 2   2 
P1  v1 
k 1
P v 
(d ) 2   1 
P1  v 2 
k
(22) Which one of the following relation is Gibb`s relation
(a) Tds= dh+vdP (b) Tds=dh-vdP (c)Tds=dh-Pdv (d) Tds=dh+Pdv
(22) Which one of the following relation is Gibb`s relation
(a) Tds= du+vdP (b) Tds=du-vdP (c)Tds=du-Pdv (d) Tds=du+Pdv
(23) The efficiency of an engine is given as
(a) 
W
W
QL
Q
QL
Q
(b) H (c)
(d ) H (e) netin ( f ) netout
Wnetin
Wnetout
Wnetout
Wnetin
QL
QH
(24) The C.O.P of a refrigerator is given as
(a) 
W
W
QL
Q
QL
Q
(b) H (c)
(d ) H (e) netin ( f ) netout
Wnetin
Wnetout
Wnetout
Wnetin
QL
QH
(25) The C.O.P of a heat pump is given as
(a) 
W
W
QL
Q
QL
Q
(b) H (c)
(d ) H (e) netin ( f ) netout
Wnetin
Wnetout
Wnetout
Wnetin
QL
QH