Page 1
Engineering Service (P) Exam,2019
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
T.B.C. : VBY-S-MCH Test Booklet Series
Serial No.
007795?
TEST BOOKLET
MECHANICAL ENGINEERING
Time Allowed : Three Hours
Maximum Marks : 300
INSTRUCTIONS
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK
THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
Please note that it is the candidate's responsibility to encode and fill in the Roll Number
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render
the Answer Sheet liable for rejection.
You have to enter your Roll Number on the Test Booklet in
the Box provided alongside. DO NOT write anything else on
the Test Booklet.
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers).
You will select the response which you want to mark on the Answer Sheet. In case you feel that
there is more than one correct response, mark the response which you consider the best. In any
case, choose ONLY ONE response for each item.
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in
the Answer Sheet.
All items carry equal marks.
Before you proceed to mark in the Answer Sheet the response to various items in the Test
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you
with your Admission Certificate.
After you have completed filling in all your responses on the Answer Sheet and the examination
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted
to take away with you the Test Booklet.
Sheets for rough work are appended in the Test Booklet at the end.
Penalty for wrong answers :
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.
There are four alternatives for the answer to every question. For each question for which a
wrong answer has been given by the candidate, one-third (0.33) of the marks assigned to
that question will be deducted as penalty.
If a candidate gives more than one answer, it will be treated as a wrong answer even if one of
the given answers happens to be correct and there will be same penalty as above to that
question.
If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty
for that question.
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
Page 2
Engineering Service (P) Exam,2019
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
T.B.C. : VBY-S-MCH Test Booklet Series
Serial No.
007795?
TEST BOOKLET
MECHANICAL ENGINEERING
Time Allowed : Three Hours
Maximum Marks : 300
INSTRUCTIONS
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK
THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
Please note that it is the candidate's responsibility to encode and fill in the Roll Number
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render
the Answer Sheet liable for rejection.
You have to enter your Roll Number on the Test Booklet in
the Box provided alongside. DO NOT write anything else on
the Test Booklet.
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers).
You will select the response which you want to mark on the Answer Sheet. In case you feel that
there is more than one correct response, mark the response which you consider the best. In any
case, choose ONLY ONE response for each item.
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in
the Answer Sheet.
All items carry equal marks.
Before you proceed to mark in the Answer Sheet the response to various items in the Test
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you
with your Admission Certificate.
After you have completed filling in all your responses on the Answer Sheet and the examination
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted
to take away with you the Test Booklet.
Sheets for rough work are appended in the Test Booklet at the end.
Penalty for wrong answers :
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.
There are four alternatives for the answer to every question. For each question for which a
wrong answer has been given by the candidate, one-third (0.33) of the marks assigned to
that question will be deducted as penalty.
If a candidate gives more than one answer, it will be treated as a wrong answer even if one of
the given answers happens to be correct and there will be same penalty as above to that
question.
If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty
for that question.
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
1. Water is discharged from a tank 4.
A nozzle at the end of an 80 mm hosepipe
maintained at a constant head of 5 m produces a jet 40 mm in diameter.
above the exit of a straight pipe 100 m When it is discharging the water
long and 15 cm in diameter. If the 1200 Lpm, the force on the joint at the
friction coefficient for the pipe is 0.01, base of the nozzle will be
the rate of flow will be nearly
0.04 m3 /s
005 M3 /s
0.06 m3 /s
0.07 m3 /s
180 N
200 N
220 N
240 N
2. A plate weighing 150 N and measuring
0.8 m x 0.8 m just slides down an
inclined plane over an oil film of F2 mm
thickness for an inclination of 30° and
velocity of 0.2 m/s. Then the viscosity of
the oil used is
5. A vertical water pipe, 1.5 m long, tapers
from 75 mm diameter at the bottom to
150 mm diameter at the top and the
rate of flow is 50 L/s upwards. If
the pressure at the bottom end is
150 kN/m2, the pressure at the top will
be nearly
(a) 0.3 N s/m 2
(a)
1952 . kN/m 2
(b) 0.4 N s/m 2
1914 kN/m2
0.5 N s/m 2
(c)
187.6 kN/m2
(d) 0.7 N s/m
2 (d)
183.8 kN/m2
3. A spherical balloon of 1.5 m diameter is
completely immersed in water and
chained to the bottom. If the chain has
a tension of 10 kN, the weight of the
balloon will be nearly
6. The stream function for a flow field is
w = 3x2 y + (2 + t)y2. The velocity at a
point P for position vector r = i + 2j- 3k
at time t = 2 will be
(a) 9.11 kN
(a) 19i - 12j
(b) 8.22 kN
21i-12j
644 kN
(c) 19i +22 j
(d) 7.33 kN (d) 21i+22j
VBY-S-MCH/ 50A 2
Page 3
Engineering Service (P) Exam,2019
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
T.B.C. : VBY-S-MCH Test Booklet Series
Serial No.
007795?
TEST BOOKLET
MECHANICAL ENGINEERING
Time Allowed : Three Hours
Maximum Marks : 300
INSTRUCTIONS
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK
THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
Please note that it is the candidate's responsibility to encode and fill in the Roll Number
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render
the Answer Sheet liable for rejection.
You have to enter your Roll Number on the Test Booklet in
the Box provided alongside. DO NOT write anything else on
the Test Booklet.
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers).
You will select the response which you want to mark on the Answer Sheet. In case you feel that
there is more than one correct response, mark the response which you consider the best. In any
case, choose ONLY ONE response for each item.
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in
the Answer Sheet.
All items carry equal marks.
Before you proceed to mark in the Answer Sheet the response to various items in the Test
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you
with your Admission Certificate.
After you have completed filling in all your responses on the Answer Sheet and the examination
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted
to take away with you the Test Booklet.
Sheets for rough work are appended in the Test Booklet at the end.
Penalty for wrong answers :
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.
There are four alternatives for the answer to every question. For each question for which a
wrong answer has been given by the candidate, one-third (0.33) of the marks assigned to
that question will be deducted as penalty.
If a candidate gives more than one answer, it will be treated as a wrong answer even if one of
the given answers happens to be correct and there will be same penalty as above to that
question.
If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty
for that question.
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
1. Water is discharged from a tank 4.
A nozzle at the end of an 80 mm hosepipe
maintained at a constant head of 5 m produces a jet 40 mm in diameter.
above the exit of a straight pipe 100 m When it is discharging the water
long and 15 cm in diameter. If the 1200 Lpm, the force on the joint at the
friction coefficient for the pipe is 0.01, base of the nozzle will be
the rate of flow will be nearly
0.04 m3 /s
005 M3 /s
0.06 m3 /s
0.07 m3 /s
180 N
200 N
220 N
240 N
2. A plate weighing 150 N and measuring
0.8 m x 0.8 m just slides down an
inclined plane over an oil film of F2 mm
thickness for an inclination of 30° and
velocity of 0.2 m/s. Then the viscosity of
the oil used is
5. A vertical water pipe, 1.5 m long, tapers
from 75 mm diameter at the bottom to
150 mm diameter at the top and the
rate of flow is 50 L/s upwards. If
the pressure at the bottom end is
150 kN/m2, the pressure at the top will
be nearly
(a) 0.3 N s/m 2
(a)
1952 . kN/m 2
(b) 0.4 N s/m 2
1914 kN/m2
0.5 N s/m 2
(c)
187.6 kN/m2
(d) 0.7 N s/m
2 (d)
183.8 kN/m2
3. A spherical balloon of 1.5 m diameter is
completely immersed in water and
chained to the bottom. If the chain has
a tension of 10 kN, the weight of the
balloon will be nearly
6. The stream function for a flow field is
w = 3x2 y + (2 + t)y2. The velocity at a
point P for position vector r = i + 2j- 3k
at time t = 2 will be
(a) 9.11 kN
(a) 19i - 12j
(b) 8.22 kN
21i-12j
644 kN
(c) 19i +22 j
(d) 7.33 kN (d) 21i+22j
VBY-S-MCH/ 50A 2
an incompressible flow
an unsteady and incompressible
flow
an unsteady and compressible flow
8300 m
8240 m
8110 m
8000 m
7. In a laminar flow through pipe, the point
of maximum instability exists at a
distance of y from the wall which is
of pipe radius R
of pipe radius R
of pipe radius R
of pipe radius R
,,
8. v = — -= - for a turbulent flow
ax ay
signifies
conservation of bulk momentum
transport
increase in u' in x-direction
followed by increase in it in
negative y-direction
turbulence is anisotropic
turbulence is isotropic
9. A flow field satisfying V • - I; = 0 as the
continuity equation represents always
(a) a steady compressible flow
10. An oil of viscosity 8 poise flows between
two parallel fixed plates, which are kept
at a distance of 30 mm apart. If the
drop of pressure for a length of 1 m is
0.3 x 104 N/m 2 and width of the plates
is 500 mm, the rate of oil flow between
the plates will be
4.2 x 10-3 m3/s
54 x10 3 m3/s
6.6 x 10-3 m3/s
7.8 x 10
-3
m3/s
11. In case of transmission of hydraulic
power by a pipeline to a turbine in a
hydroelectric power station, the
maximum power transmission efficiency
through the pipeline is
76%
67%
54%
42%
12. A pipe, having a length 200 m and
200 mm diameter with friction factor
0.015, is to be replaced by a 400 mm
diameter pipe of friction factor 0.012 to
convey the same quantity of flow. The
equivalent length of the new pipe for the
same head loss will be
VBY-S-MCH/ 50A
3 [ P.T.O.
Page 4
Engineering Service (P) Exam,2019
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
T.B.C. : VBY-S-MCH Test Booklet Series
Serial No.
007795?
TEST BOOKLET
MECHANICAL ENGINEERING
Time Allowed : Three Hours
Maximum Marks : 300
INSTRUCTIONS
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK
THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
Please note that it is the candidate's responsibility to encode and fill in the Roll Number
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render
the Answer Sheet liable for rejection.
You have to enter your Roll Number on the Test Booklet in
the Box provided alongside. DO NOT write anything else on
the Test Booklet.
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers).
You will select the response which you want to mark on the Answer Sheet. In case you feel that
there is more than one correct response, mark the response which you consider the best. In any
case, choose ONLY ONE response for each item.
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in
the Answer Sheet.
All items carry equal marks.
Before you proceed to mark in the Answer Sheet the response to various items in the Test
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you
with your Admission Certificate.
After you have completed filling in all your responses on the Answer Sheet and the examination
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted
to take away with you the Test Booklet.
Sheets for rough work are appended in the Test Booklet at the end.
Penalty for wrong answers :
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.
There are four alternatives for the answer to every question. For each question for which a
wrong answer has been given by the candidate, one-third (0.33) of the marks assigned to
that question will be deducted as penalty.
If a candidate gives more than one answer, it will be treated as a wrong answer even if one of
the given answers happens to be correct and there will be same penalty as above to that
question.
If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty
for that question.
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
1. Water is discharged from a tank 4.
A nozzle at the end of an 80 mm hosepipe
maintained at a constant head of 5 m produces a jet 40 mm in diameter.
above the exit of a straight pipe 100 m When it is discharging the water
long and 15 cm in diameter. If the 1200 Lpm, the force on the joint at the
friction coefficient for the pipe is 0.01, base of the nozzle will be
the rate of flow will be nearly
0.04 m3 /s
005 M3 /s
0.06 m3 /s
0.07 m3 /s
180 N
200 N
220 N
240 N
2. A plate weighing 150 N and measuring
0.8 m x 0.8 m just slides down an
inclined plane over an oil film of F2 mm
thickness for an inclination of 30° and
velocity of 0.2 m/s. Then the viscosity of
the oil used is
5. A vertical water pipe, 1.5 m long, tapers
from 75 mm diameter at the bottom to
150 mm diameter at the top and the
rate of flow is 50 L/s upwards. If
the pressure at the bottom end is
150 kN/m2, the pressure at the top will
be nearly
(a) 0.3 N s/m 2
(a)
1952 . kN/m 2
(b) 0.4 N s/m 2
1914 kN/m2
0.5 N s/m 2
(c)
187.6 kN/m2
(d) 0.7 N s/m
2 (d)
183.8 kN/m2
3. A spherical balloon of 1.5 m diameter is
completely immersed in water and
chained to the bottom. If the chain has
a tension of 10 kN, the weight of the
balloon will be nearly
6. The stream function for a flow field is
w = 3x2 y + (2 + t)y2. The velocity at a
point P for position vector r = i + 2j- 3k
at time t = 2 will be
(a) 9.11 kN
(a) 19i - 12j
(b) 8.22 kN
21i-12j
644 kN
(c) 19i +22 j
(d) 7.33 kN (d) 21i+22j
VBY-S-MCH/ 50A 2
an incompressible flow
an unsteady and incompressible
flow
an unsteady and compressible flow
8300 m
8240 m
8110 m
8000 m
7. In a laminar flow through pipe, the point
of maximum instability exists at a
distance of y from the wall which is
of pipe radius R
of pipe radius R
of pipe radius R
of pipe radius R
,,
8. v = — -= - for a turbulent flow
ax ay
signifies
conservation of bulk momentum
transport
increase in u' in x-direction
followed by increase in it in
negative y-direction
turbulence is anisotropic
turbulence is isotropic
9. A flow field satisfying V • - I; = 0 as the
continuity equation represents always
(a) a steady compressible flow
10. An oil of viscosity 8 poise flows between
two parallel fixed plates, which are kept
at a distance of 30 mm apart. If the
drop of pressure for a length of 1 m is
0.3 x 104 N/m 2 and width of the plates
is 500 mm, the rate of oil flow between
the plates will be
4.2 x 10-3 m3/s
54 x10 3 m3/s
6.6 x 10-3 m3/s
7.8 x 10
-3
m3/s
11. In case of transmission of hydraulic
power by a pipeline to a turbine in a
hydroelectric power station, the
maximum power transmission efficiency
through the pipeline is
76%
67%
54%
42%
12. A pipe, having a length 200 m and
200 mm diameter with friction factor
0.015, is to be replaced by a 400 mm
diameter pipe of friction factor 0.012 to
convey the same quantity of flow. The
equivalent length of the new pipe for the
same head loss will be
VBY-S-MCH/ 50A
3 [ P.T.O.
13.
Certain quantities cannot be located on
the graph by a point but are given by
the area under the curve corresponding
to the process. These quantities in
concepts of thermodynamics are called
as
cyclic functions
point functions
path functions
real functions
14.
When 25 kg of water at 95 °C is mixed
with 35 kg of water at 35 °C, the
pressure being taken as constant at
surrounding temperature of 15 °C,
and Cp of water is 4-2 kJ/kg K, the
decrease in available energy due to
mixing will be nearly
(a) 270.5 kJ
( 1
4 277-6 kJ
281-8 kJ
288-7 kJ
15. A frictionless piston cylinder device
contains 5 kg of steam at 400 kPa and
200 °C. The heat is now transferred to
the steam until the temperature reaches
250 °C. If the piston is not attached to
a shaft, its mass is constant, and
by taking the values of specific
volume v 1 as 0-53434 m3 /kg and v2 as
0.59520 m3/kg, the work done by the
steam during this process is
121.7 kJ
137-5 kJ
153-3 kJ
189.1 kJ
16.
A diesel engine has a compression ratio
of 14 and cutoff takes place at 6% of the
stroke. The air standard efficiency will
be
74-5%
60-5%
(C) 52.5%
(d) 44.5%
17.
A gas mixture consists of 3 kg of 02 , 5 kg
of N2 and 12 kg of CH4. The mass
fraction and mole fraction of 02 are
0-25 and 0-125
0-15 and 0-092
0-25 and 0.092
0-15 and 0-125
18. An insulated pipe of 50 mm outside
diameter with c = 0 8 is laid in a room
at 30 °C. If the surface temperature is
250 °C and the convective heat transfer
coefficient is 10 W/m 2 K, the total heat
loss per unit length of the pipe will be
896-6 W/m
818-8 W/m
786-4 W/m
742-2 W/m
VBY-S-MCH/50A 4
Page 5
Engineering Service (P) Exam,2019
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
T.B.C. : VBY-S-MCH Test Booklet Series
Serial No.
007795?
TEST BOOKLET
MECHANICAL ENGINEERING
Time Allowed : Three Hours
Maximum Marks : 300
INSTRUCTIONS
IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK
THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES
OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
Please note that it is the candidate's responsibility to encode and fill in the Roll Number
and Test Booklet Series A, B, C or D carefully and without any omission or discrepancy at
the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render
the Answer Sheet liable for rejection.
You have to enter your Roll Number on the Test Booklet in
the Box provided alongside. DO NOT write anything else on
the Test Booklet.
This Test Booklet contains 150 items (questions). Each item comprises four responses (answers).
You will select the response which you want to mark on the Answer Sheet. In case you feel that
there is more than one correct response, mark the response which you consider the best. In any
case, choose ONLY ONE response for each item.
You have to mark your responses ONLY on the separate Answer Sheet provided. See directions in
the Answer Sheet.
All items carry equal marks.
Before you proceed to mark in the Answer Sheet the response to various items in the Test
Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you
with your Admission Certificate.
After you have completed filling in all your responses on the Answer Sheet and the examination
has concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted
to take away with you the Test Booklet.
Sheets for rough work are appended in the Test Booklet at the end.
Penalty for wrong answers :
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.
There are four alternatives for the answer to every question. For each question for which a
wrong answer has been given by the candidate, one-third (0.33) of the marks assigned to
that question will be deducted as penalty.
If a candidate gives more than one answer, it will be treated as a wrong answer even if one of
the given answers happens to be correct and there will be same penalty as above to that
question.
If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty
for that question.
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO
1. Water is discharged from a tank 4.
A nozzle at the end of an 80 mm hosepipe
maintained at a constant head of 5 m produces a jet 40 mm in diameter.
above the exit of a straight pipe 100 m When it is discharging the water
long and 15 cm in diameter. If the 1200 Lpm, the force on the joint at the
friction coefficient for the pipe is 0.01, base of the nozzle will be
the rate of flow will be nearly
0.04 m3 /s
005 M3 /s
0.06 m3 /s
0.07 m3 /s
180 N
200 N
220 N
240 N
2. A plate weighing 150 N and measuring
0.8 m x 0.8 m just slides down an
inclined plane over an oil film of F2 mm
thickness for an inclination of 30° and
velocity of 0.2 m/s. Then the viscosity of
the oil used is
5. A vertical water pipe, 1.5 m long, tapers
from 75 mm diameter at the bottom to
150 mm diameter at the top and the
rate of flow is 50 L/s upwards. If
the pressure at the bottom end is
150 kN/m2, the pressure at the top will
be nearly
(a) 0.3 N s/m 2
(a)
1952 . kN/m 2
(b) 0.4 N s/m 2
1914 kN/m2
0.5 N s/m 2
(c)
187.6 kN/m2
(d) 0.7 N s/m
2 (d)
183.8 kN/m2
3. A spherical balloon of 1.5 m diameter is
completely immersed in water and
chained to the bottom. If the chain has
a tension of 10 kN, the weight of the
balloon will be nearly
6. The stream function for a flow field is
w = 3x2 y + (2 + t)y2. The velocity at a
point P for position vector r = i + 2j- 3k
at time t = 2 will be
(a) 9.11 kN
(a) 19i - 12j
(b) 8.22 kN
21i-12j
644 kN
(c) 19i +22 j
(d) 7.33 kN (d) 21i+22j
VBY-S-MCH/ 50A 2
an incompressible flow
an unsteady and incompressible
flow
an unsteady and compressible flow
8300 m
8240 m
8110 m
8000 m
7. In a laminar flow through pipe, the point
of maximum instability exists at a
distance of y from the wall which is
of pipe radius R
of pipe radius R
of pipe radius R
of pipe radius R
,,
8. v = — -= - for a turbulent flow
ax ay
signifies
conservation of bulk momentum
transport
increase in u' in x-direction
followed by increase in it in
negative y-direction
turbulence is anisotropic
turbulence is isotropic
9. A flow field satisfying V • - I; = 0 as the
continuity equation represents always
(a) a steady compressible flow
10. An oil of viscosity 8 poise flows between
two parallel fixed plates, which are kept
at a distance of 30 mm apart. If the
drop of pressure for a length of 1 m is
0.3 x 104 N/m 2 and width of the plates
is 500 mm, the rate of oil flow between
the plates will be
4.2 x 10-3 m3/s
54 x10 3 m3/s
6.6 x 10-3 m3/s
7.8 x 10
-3
m3/s
11. In case of transmission of hydraulic
power by a pipeline to a turbine in a
hydroelectric power station, the
maximum power transmission efficiency
through the pipeline is
76%
67%
54%
42%
12. A pipe, having a length 200 m and
200 mm diameter with friction factor
0.015, is to be replaced by a 400 mm
diameter pipe of friction factor 0.012 to
convey the same quantity of flow. The
equivalent length of the new pipe for the
same head loss will be
VBY-S-MCH/ 50A
3 [ P.T.O.
13.
Certain quantities cannot be located on
the graph by a point but are given by
the area under the curve corresponding
to the process. These quantities in
concepts of thermodynamics are called
as
cyclic functions
point functions
path functions
real functions
14.
When 25 kg of water at 95 °C is mixed
with 35 kg of water at 35 °C, the
pressure being taken as constant at
surrounding temperature of 15 °C,
and Cp of water is 4-2 kJ/kg K, the
decrease in available energy due to
mixing will be nearly
(a) 270.5 kJ
( 1
4 277-6 kJ
281-8 kJ
288-7 kJ
15. A frictionless piston cylinder device
contains 5 kg of steam at 400 kPa and
200 °C. The heat is now transferred to
the steam until the temperature reaches
250 °C. If the piston is not attached to
a shaft, its mass is constant, and
by taking the values of specific
volume v 1 as 0-53434 m3 /kg and v2 as
0.59520 m3/kg, the work done by the
steam during this process is
121.7 kJ
137-5 kJ
153-3 kJ
189.1 kJ
16.
A diesel engine has a compression ratio
of 14 and cutoff takes place at 6% of the
stroke. The air standard efficiency will
be
74-5%
60-5%
(C) 52.5%
(d) 44.5%
17.
A gas mixture consists of 3 kg of 02 , 5 kg
of N2 and 12 kg of CH4. The mass
fraction and mole fraction of 02 are
0-25 and 0-125
0-15 and 0-092
0-25 and 0.092
0-15 and 0-125
18. An insulated pipe of 50 mm outside
diameter with c = 0 8 is laid in a room
at 30 °C. If the surface temperature is
250 °C and the convective heat transfer
coefficient is 10 W/m 2 K, the total heat
loss per unit length of the pipe will be
896-6 W/m
818-8 W/m
786-4 W/m
742-2 W/m
VBY-S-MCH/50A 4
19. A wire of 8 mm diameter at a
temperature of 60 °C is to be insulated
by a material having k = 174 W/m K.
The heat transfer coefficient on the
outside ha = 8 W /m 2 K and ambient
temperature Ta = 25 °C. The maximum
thickness of insulation for maximum
heat loss will be
(a) 15.25 mm
04
16.50 mm
(0
17-75 mm
(d) 18.25 mm
20. In liquid metals, thermal boundary layer
develops much faster than velocity
boundary layer due to
lower value of Nusselt number
higher value of Prandtl number
lower value of Prandtl number
higher value of Nusselt number
21. The temperature of a body of area 01 m2
is 900 K. The wavelength for maximum
monochromatic emissive power will be
nearly
2-3 p.m
3.2 pm
4-1 pm
5-0 gm
22. Consider the following statements :
For the laminar condensation on a
vertical plate, the Nusselt theory says
that
inertia force in the film is negligible
compared to viscosity and weight
heat flow is mainly by conduction
through the liquid film, convection
in liquid film as well as in vapour is
neglected
velocity of vapour is very high
Which of the above statements are
correct?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
23. In transition boiling, heat flux decreases
due to which of the following?
Low value of film heat transfer
coefficient at the surface during
100°C to 120°C surface
temperature
Major portion of heater surface is
covered by vapour film which has
smaller thermal conductivity as
compared to liquid
Nucleate boiling occurs very fast
Select the correct answer using the code
given below.
1 only
2 only
3 only
1, 2 and 3
VBY-S-MCH/ 50A
5 1 P.T.O.
Read More