1/10
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING- C to D Bridge Course Examination WINTER 2018
Subject Code: C320201 Date: 10-01-2019
Subject Name: Thermodynamics Hydraulics
Time: 10:30 AM TO 12:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Each question is of 1 mark.
4. Use of only simple calculator is permitted. (Scientific/Higher Version not allowed).
5. English version is authentic
No.
Question Text and Option.
1.
The unit of temperature in S.I unit
A.
Centigrade
B.
Celsius
C.
Fahrenheit
D.
Kelvin


A.

B.

C.

D.

2.
Which of the following is the extensive property of a thermodynamics system?
A.
Pressure
B.
Volume
C.
Temperature
D.
Density


A.

B.

C.

D.

3.
A definite area or a space where some thermodynamic process takes place is known
A.
thermodynamic system
B.
thermodynamic cycle
C.
thermodynamic process
D.
thermodynamic law


A.

B.

C.

D.

4.
An open system is one in
A.
Mass transfer across boundary
B.
Energy transfer across boundary
C.
Both transfer across boundary
D.
None of these


A.

B.

C.

D.

5.
Which of the following is an intensive property of a thermodynamic system?
A.
Volume
B.
Mass
C.
Temperature
D.
Energy


A.

B.

C.

D.

6.
Which of the following is not intensive property?
A.
Pressure
B.
Temperature
C.
Density
D.
Heat


A.

B.

2/10
C.

D.

7.
Mixture of steam and water form a
A.
Close system
B.
Open system
C.
Homogeneous system
D.
Heterogeneous system


A.

B.

C.

D.

8.
For closed between system and surrounding.
A.
Only mass transfer is possible
B.
Only energy transfer is possible
C.
Neither mass nor energy transfer is possible
D.
None of these


A.

B.

C.

D.

9.
The basis for measuring thermodynamic property of temperature is given
A.
Zeroth law of thermodynamics
B.
First law of thermodynamics
C.
Second law of thermodynamics
D.
Third law of thermodynamics


A.

B.

C.

D.

10.
Second law of thermodynamics
A.
enthalpy
B.
pressure
C.
volume
D.
entropy


A.

B.

C.

D.

11.
First law of thermodynamics deals with conservation
A.
mass
B.
heat
C.
momentum
D.
energy


A.

B.

C.

D.

12.
The processes occurring in open system which permit the transfer of mass to and from the system are known
A.
flow processes
B.
non-flow processes
C.
adiabatic processes
D.
None of these


A.

B.

C.

D.

13.
The unit of entropy
A.
J/kg
B.
J/K
C.
J
D.
J/kgs


A.
J/kg
B.
J/K
C.
J
D.
J/kgs
14.
Enthalpy is equal
A.
U+PV
B.
U-PV
C.
S+PV
D.
S-PV


3/10
A.
U+PV
B.
U-PV
C.
S+PV
D.
S-PV
15.
A perpetual motion machine
A.
a thermodynamic machine
B.
a hypothetical machine whose operation would violate the laws of thermodynamics
C.
a hypothetical machine
D.
an inefficient machine.


A.

B.

C.

D.

16.
One watt is equal
A.
1 N/min
B.
10 N/s
C.
1 Nm/s
D.
100 N/s


A.
1 N/min
B.
10 N/s
C.
1 Nm/s
D.
100 N/s
17.
The heat and mechanical energies are mutually convertible. This statement was established
A.
Joule
B.
Boyle
C.
Charles
D.
None of these


A.

B.

C.

D.

18.
Work done in a free expansion process
A.
zero
B.
minimum
C.
maximum
D.
Positive


A.

B.

C.

D.

19.
The process is adiabatic, if the value of n in the equation PVn= is
A.
0
B.
1
C.
γ
D.
∝

PVn= n
A.
0
B.
1
C.
γ
D.
∝
20.
The ratio of Cp and Cv for air
A.
1.8
B.
2.3
C.
1
D.
1.4

Cp Cv
A.
1.8
B.
2.3
C.
1
D.
1.4
21.
Relation between Cp and Cv is given
A.
Cp Cv
B.
Cv= γ
C.
Cp Cv
D.
Cp γ =Cv R

Cp Cv
A.
Cp Cv
B.
Cv= γ
C.
Cp Cv
D.
Cp γ =Cv R
22.
Select the correct statement as per Charles' law
A.
p.v constant, if T is kept constant
B.
v/T constant, if p is kept constant
4/10
C.
p/T constant, if v is kept constant
D.
T/p constant, if v is kept constant


A.
p.v T
B.
v/T p
C.
p/T v
D.
T/p v
23.
The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is
A.
specific heat at constant volume
B.
specific heat at constant pressure
C.
kilo Joule
D.
None of these


A.

B.

C.

D.

24.
If in the equation pvn the value of n then the process is
A.
constant volume process
B.
adiabatic process
C.
constant pressure process
D.
isothermal process

pvn C n
A.

B.

C.

D.

25.
An isentropic process on T-S diagram is represented by
A.
Horizontal line
B.
Vertical line
C.
Inclined line
D.
Curved line

T-S
A.

B.

C.

D.

26.
For any gas
A.
Cp<Cv
B.
Cp+Cv
C.
Cp=Cv
D.
Cp>Cv


A.
Cp<Cv
B.
Cp+Cv
C.
Cp=Cv
D.
Cp>Cv
27.
For ideal gas, in throttling process
A.
Volume remains constant
B.
Temperature remains constant
C.
Pressure remains constant
D.
all of these


A.

B.

C.

D.

28.
According to Gay-Lussac (P=absolute pressure ,V=volume ,T=absolute temperature)
A.

B.
V/T
C.
P/T
D.
T/P


A.

B.
V/T
C.
P/T
D.
T/P
29.
The air standard efficiency of an Otto cycle is given (where r Compression ratio, and γ Ratio of specific heats)
A.
1 rγ 1
B.
1 rγ 1
C.
1 y− 1
D.
1 y− 1
5/10

r γ
A.
1 rγ 1
B.
1 rγ 1
C.
1 y− 1
D.
1 y− 1
30.
Reversed Joule cycle is known
A.
Carnot cycle
B.
Bell-Coleman cycle
C.
Rankine cycle
D.
Stirling cycle


A.

B.

C.

D.

31.
Diesel cycle consists of_____processes.
A.
two constant volume and two isentropic
B.
two constant pressure and two isentropic
C.
two constant volume and two isothermal
D.
one constant pressure, one constant volume and two isentropic


A.

B.

C.

D.

32.
The constant volume cycle is
A.
Carnot cycle
B.
Otto cycle
C.
Diesel cycle
D.
Joule cycle


A.

B.

C.

D.

33.
The compression ratio for diesel engines
A.
3 to 6
B.
5 to 8
C.
16 to 23
D.
20 to 30


A.
3 6
B.
5 8
C.
16 23
D.
20 30
34.
For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the
A.
Dual cycle, Diesel cycle, Otto cycle
B.
Otto cycle, Diesel cycle, Dual cycle
C.
Dual cycle, Otto cycle, Diesel cycle
D.
Diesel cycle, Otto cycle, Dual cycle


A.

B.

C.

D.

35.
The compression ratio for petrol engines
A.
8 to 12
B.
3 to 6
C.
10 to 20
D.
15 to 30


A.
8 12
B.
3 6
C.
10 20
D.
15 30
36.
Otto cycle consists
A.
two constant volume and two isentropic processes
B.
two constant pressure and two isentropic processes
6/10
C.
two constant volume and two isothermal processes
D.
one constant pressure, one constant volume and two isentropic processes


A.

B.

C.

D.

37.
The expansion ratio is the ratio (where V1= Volume at the beginning of expansion, and V2= Volume at the end of expansion)
A.
V1V2
B.
V2V1
C.

D.


V1 V2
A.
V1V2
B.

C.
V1+V2V1
D.

38.
Carnot cycle consists of
A.
two constant volume and two isentropic processes
B.
two isothermal and two isentropic processes
C.
two constant pressure and two isentropic processes
D.
one constant volume, one constant pressure and two isentropic processes


A.

B.

C.

D.

39.
For the same compression ratio, the efficiency of diesel cycle Otto cycle.
A.
greater than
B.
less than
C.
equal to
D.
None of these


A.

B.

C.

D.

40.
The unit of pressure in S.I
A.
Kg/cm2
B.
Pascal
C.
Bar
D.
None of these


A.
Kg/cm2
B.

C.

D.

41.
The property by virtue of which a liquid opposes relative motion between its different layers is called
A.
Surface tension
B.
Coefficient of viscosity
C.
Viscosity
D.
Osmosis


A.

B.

C.

D.

42.
When a body floating in a liquid, is displaced slightly, it oscillates
A.
C.G. of body
B.
Center of pressure
7/10
C.
Center of buoyancy
D.
Metacentre


A.

B.

C.

D.

43.
A fluid which obeys the Newton's law of viscosity is termed
A.
Real fluid
B.
Ideal fluid
C.
Newtonian fluid
D.
Non-Newtonian fluid


A.

B.

C.

D.

44.
Molecules of fluids get attracted due
A.
surface tension
B.
capillarity action
C.
adhesion
D.
cohesion


A.

B.

C.

D.

45.
In an immersed body, centre of pressure
A.
At the centre of gravity
B.
Above the centre of gravity
C.
Below the centre of gravity
D.
Could be above or below e.g. depending on density of body and liquid


A.

B.

C.

D.

46.
The flow in a pipe is neither laminar nor turbulent when Reynold number
A.
Less than 2000
B.
Between 2000 and 2800
C.
More than 2800
D.
None of these


A.
2000
B.
2000 2800
C.
2800
D.

47.
Fluid is a substance
A.
Cannot be subjected to shear forces
B.
Always expands until it fills any container
C.
Has the same shear stress at a point regardless of its motion
D.
Cannot remain at rest under action of any shear force


A.

B.

C.

D.

48.
Stoke is the unit
A.
Kinematic viscosity in C. G. S. units
B.
Kinematic viscosity in M. K. S. units
C.
Dynamic viscosity in M. K. S. units
D.
Dynamic viscosity in S. I. units


A.

B.

8/10
C.

D.

49.
The pressure measured with the help of a pressure gauge is
A.
Atmospheric pressure
B.
Gauge pressure
C.
Absolute pressure
D.
Mean pressure


A.

B.

C.

D.

50.
Capillary action is due to
A.
Surface tension
B.
Cohesion of the liquid
C.
Adhesion of the liquid molecules and the molecules on the surface of a solid
D.
All of these


A.

B.

C.

D.

51.
A flow through a long pipe at constant rate is
A.
Steady uniform flow
B.
Steady non-uniform flow
C.
Unsteady uniform flow
D.
Unsteady non-uniform flow


A.

B.

C.

D.

52.
The continuity equation is connected
A.
Open channel/pipe flow
B.
Compressibility of fluids
C.
Conservation of mass
D.
Steady/unsteady flow


A.

B.

C.

D.

53.
According to Bernoulli's equation
A.
Z p/w v²/2g constant
B.
Z p/w v²/2g constant
C.
Z p/w v²/2g constant
D.
Z p/w v²/2g constant


A.
Z p/w v²/2g
B.
Z p/w v²/2g
C.
Z p/w v²/2g
D.
Z p/w v²/2g
54.
The resultant upward pressure of the fluid on an immersed body is
A.
Up-thrust
B.
Buoyancy
C.
Centre of pressure
D.
All are correct


A.

B.

C.

D.

55.
The unit of viscosity
A.
Meters² per sec
B.
kg-sec/meter
C.
Newton-sec per meter²
D.
Newton-sec per meter


A.

B.

C.

D.

56.
Uniform flow is motion whose
A.
Velocity is zero
B.
Velocity varies with head
C.
Velocity is independent of time
D.
Velocity is same at every point at a given instant of time
9/10


A.

B.

C.

D.

57.
Motion of a liquid in a volute casing of a centrifugal pump is an example
A.
Rotational flow
B.
Radial flow
C.
Forced spiral vortex flow
D.
Spiral vortex flow


A.

B.

C.

D.

58.
High specific speed of a pump implies it
A.
Centrifugal pump
B.
Mixed flow pump
C.
Axial flow pump
D.
Any one of the these


A.

B.

C.

D.

59.
The flow rate in gear
A.
Increases with increase in pressure
B.
Decreases with increase in pressure
C.
More or less remains constant with increase in pressure
D.
Unpredictable


A.

B.

C.

D.

60.
In a centrifugal pump, the liquid enters the
A.
At the top
B.
At the bottom
C.
At the centre
D.
From sides


A.

B.

C.

D.

61.
Which of the following statement is correct?
A.
The centrifugal pump is suitable for large discharge and smaller heads
B.
The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump
C.
The efficiency of centrifugal pump is less as compared to reciprocating pump
D.
All of the above


A.

B.

C.

D.

62.
Which of the following is NOT a type of positive displacement pumps?
A.
Reciprocating pump
B.
Rotary displacement pump
C.
Centrifugal pump
D.
None of these


A.

B.

C.

D.

63.
Rotary displacement pumps are suitable for handling
10/10
A.
oils
B.
gritty liquids
C.
both oils as well as gritty liquids
D.
None of these


A.

B.

C.

D.

64.
In a centrifugal pump, the regulating valve is provided on
A.
Casing
B.
Delivery pipe
C.
Suction pipe
D.
Impeller


A.

B.

C.

D.

65.
The unit of discharge
A.
m/s
B.
m/s2
C.
m3/s
D.
m2/s


A.
m/s
B.
m/s2
C.
m3/s
D.
m2/s
66.
Medium specific speed of a pump implies it
A.
Centrifugal pump
B.
Mixed flow pump
C.
Axial flow pump
D.
None of these


A.

B.

C.

D.

67.
Which of the following pump is suitable for small discharge and high heads?
A.
Centrifugal pump
B.
Axial flow pump
C.
Mixed flow pump
D.
Reciprocating pump


A.

B.

C.

D.

68.
Multistage centrifugal pumps are used to
A.
High discharge
B.
High head
C.
Pumping of viscous fluids
D.
High efficiency.


A.

B.

C.

D.

69.
Low specific speed of a pump implies it
A.
Centrifugal pump
B.
Mixed flow pump
C.
Axial flow pump
D.
None of these


A.

B.

C.

D.

70.
How many strokes does a single piston pump need to discharge oil?
A.
One stroke
B.
Two strokes
C.
Three strokes
D.
None of these


A.

B.

C.

D.