Exam Details
| Subject | mechanical engineering | |
| Paper | ||
| Exam / Course | ||
| Department | ||
| Organization | indian space research organisation | |
| Position | ||
| Exam Date | 2010 | |
| City, State | , |
Question Paper
. 2010.; MECHANICAL ENGINEERING -II SET-A
1.
If thermal conductivity of a material of wall varies as the temperature at the center of
2.
The spectral emissive power E 1 for a diffusely emitting surface is E 0 for A 3j1m E1 =150 W/m2 J01Z for 3 A 12J01Z E1 =300W/m2 Jfffl for 12 A 25Jfffl; E 0 for A 25Jfffl. The total emissive power of the surface over the entire spectrum is
the wall will be is
Depends on other factors More than that in case ofconstant thermal
conductivity
Less than that in case ofconstant thermal None ofthe above
conductivity
2500 W/m2 4000 W/m2 5250 W/m2
3.
A wire is plastically deformed bent by supplying a force of 40 N over a distance of 0.8 m. (The force moves in the direction in which the distance is measured). If the wire has a mass of 0.2 kg and a specific heat of 0.5 kJ/kg.oC estimate the maximum increase in the average temperature of the wire
4.
Two rods one of length L and the other of length 2L are made of the same material and have the same diameter. The two ends of the longer diameter. The two ends of the longer rod are maintained at 100°C. One end of the shorter rod is maintained at 100° C while the other end is insulated. Both the rods are exposed to the same environment at 40°C. The temperature at the insulated end of the shorter rod is measured to be 55 C. The temperature at the midpoint of the longer rod would be
40°C 50°C 55°C 100°C
5.
A sphere, a cube and a disc all of the same material, quality and volume are heated to 900 K and left in air. Which of these will have the lowest rate of cooling
Cube Disc Sphere All will have the same rate of cooling
6.
Air with initial condition of pl,vl expands to final condition of 3vl. The process is
Hyperbolic Adiabatic Polytropic with n Polytropic with n
7.
Sun's surface at 5800 K emits radiation at a wavelength of 0.5Jl.A furnace at 300° C will emit through a small opening, radiation at a wavelength of
5).1. 0.5).1. 2.5).1. 0.25J.!.
8.
Polytropic index n is given by
IOP,
PI P2 . 2 I
lot:J .lot:] lot:]
Mechanical-II SET-A
..
INDIAN SPACE RESEARCH ORGANISATION Page: 20F 10
MECHANICAL ENGINEERING -II SET-A
9. TheheatflowratethroughparallelwallsofthicknessLb L2andL3andhavingsurface areas A1,A2 and A3 thermal conductivities kl ,k2 and k3 respectively and first and last walls maintained at temperatures tl and t2 will be
10. Which of the following property of air does not increase with rise in temperature? . .. . Thermal Th 1dOffi
SpeCI IC gravIty mematIc VISCOSIty . erma 1 USIVIty
can UCtlVIty
11. Choose the correct figure representing gas to gas heat transfer in parallel flow heat exchanger?
12. The value of Prandtl number for air is about
0.1 0.3 0.7 10.5
13. A body cools from 90° C to 800 C in 5 minutes. Under the same external conditions to cool from 80° C to 70° C the body will take
5 minutes 4 minutes 2.5 minutes More than 5 minutes
14. When the temperature of a solid surface changes from 227° Cto 1227°C, its total emissive power changes from to E,. The ratio will be
3 9 81 Cannot be determined on the basis ofinformation provided
15. Characteristic gas constant of a gas is equal to
IEJIl
INDIAN SPACe ReSEARCH ORGANISATION
10
MECHANICAL ENGINEERING -IT SET-A
16. The matrix
is its own adjoint. The value of x will be
5 3
17. The temperature ofsun can be measured using a
Standard. Radiation Platinum resistance Mercury
thermometer pyrometer thermometer thermometer
18. A car moving with uniform acceleration covers 450 m in a 5 second interval, and covers 700 m in the next 5 second interval. The acceleration of the car is
50 m/s2 25 mls2 10 mls2
19. A particle starts from rest with a constant acceleration
v
••••• ••".
am/sec2 and after some time it decelerates at a uniform
2
rate of f3 m/sec till it comes to rest. If the total time taken
between two rests positions is the maximum velocity
acquired by the particle would be
a+f3
t
f3Jt
22 a+f3 a-f3
20. Two metallic blocks having masses in the ratio 3 are made to slide down a friction less
inclined plane starting initially from rest position. When these blocks reach the bottom of the
inclined plane, they will have their kinetic energies in the ratio
2:3 3:5 3:2 7:4
21. A particle is projected at an angle 8 to the horizontal and it attains a maximum height H. The
time taken by the projectile to reach the highest point, of its path is
JH .J2HsinB
.J.2H
g g smB
22. The tension in the cable supporting a lift moving upwards is twice the tension when the lift
moves downwards. What is the acceleration of the lift?
g/4 g/3 g/2 g
23. For the apparent weight of a body at equator to become zero, the earth should rotate with an
angular velocity of
2 g
V; i
r
..
. 2010. MECHANICAL ENGINEERING -II SET-A
24. A cantilever beam AB of length Land uniform flexural rigidity EI has a bracket A C attached to its free end shown in Fig. Vertical load is applied to the free end C of the bracket. In order that the deflection of point A to be zero the ratio a/L should be
1 12
.!. 2 3 4 3
25. Given that PE the crippling load given by Euler Pc the load at failure due to direct compression PR= the load in accordance with the Rankine's criterion of failure Then PR is given by
(PE +Pc
None ofthe above
2
26. Bending moment M and torque is applied on a solid circular shaft. Ifthe maximum bending
stress equals to maximum shear stress developed, them M is equal to
T
2T 4T
2
27. For solid shaft subjected to a torque of 18000 Nm having a permissible shear stress of 60N/mnl,
the diameter of shaft is
115mm 121mm 149mm l08mm
28. Shear force is
Rate of change ofloading Sum ofbending moments
Rate of change ofbending moment None ofthe above
29. Maximum deflection in cantilever due to pure bending moment M at its end is
Me/2El M12/3El Me/4El M12/6EI
30. Maximum shear stress in Mohr's circle is equal to
Radius ofcircle Diameter ofcircle Center of circle from y-axis Chord ofcircle
MECHANICAL ENGINEERING -II SET-A
31. Hardness of steel depends on
Amount ofcarbon it contains The shape and distribution ofthe carbides in iron
Method offabrication Contents ofalloying elements
32. The modulus of cos a sin a is
.a a
•2 a 1 2a
2cos(c) sm cos
22 2 2
33.
Hardnes of martensite is about 65 RC 48 RC 57 RC 80
34.
Materials after cold working are subjected to following process to relieve stresses
Hot working Tempering Normalizing Annealing
35.
In drop forging the forging is done by
Dropping the workpiece at high velocity
Dropping the hammer at high velocity
Dropping the die with hammer at high velocity
Dropping a weight on hammer to produce requisite impact
36.
Which of the machine tools can be used for boring
1.
Lathe
2.
Drilling machine
3.
Vertical milling machine
4.
Horizontal milling machine
2 and 4 1 and 2
37.
The vernier reading should not be taken at its face value before an actual check has been taken for
Temperature(a) Zero error Its calibration Flatness ofmeasuring jaws equalization
38. High carbon steel carries carbon percentage of
0.1 to 0.3% 0.3 to 0.6% 0.6 to 0.8% 0.8 to 1.5%
39. In order to measure/detect materials by non-destructive testing the method generally used is
Acoustic emission Infrared radiometer
Liquid crystallography Therrnochemic point
40. Shock resisting steels should have
Low wear resistance High wear resistance
Toughness Poor hardenability
Mechanical -II SET-A
-..
2010' MECHANICAL ENGINEERING -II SET-A
..
41. A screw having coeffiCient of friction equal to or greater than the tangent of the load angle is
known as
Machine screw Selflocking screw Set-screws Ball-bearing type screws
42. A bolt is designed with a large factor of safety, on the basis of
Direct tensile stress Direct compressive stress
Direct bending stress Direct shear stress
43. For two springshavil1g same stiffness are in series, the equivalent stiffness would be
k k
k 2k
4 2
44. A material is classified as brittle, if the elongation in a gauge length of 59 mm, is less than
45. In an extra humid atmosphere which one of the following motor would you select?
Open type Semi-protected Drip proof Totally enclosed fan cooled
46. In fillet weld throat is
Perpendicular distance from the root to the hypotenuse
The smaller side oftriangle ofthe fillet
The larger side of triangle of the fillet
None of the above
47. Sensitiveness of a governor is
The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed.
The ratio of the maximum speed to minimum speed within the operating range
The ratio ofthe difference between the maximum and mean speed to that ofminimum to mean speed
The range of variation ofengine speed
48. The value of c which makes the angle 45° between a=i cj and b i j is
1
1 .J2 .J2 0
49. For traction applications, the type of motor best suited is
Induction motor Synchronous motor DC shunt motor DC series motor
50. In simple harmonic motion the acceleration is proportional to
Displacement Linear velocity
Angular velocity Rate of change of angular velocity
MECHANICAL ENGINEERING -II SET-A
51. A vibro meter
Indicates vibration aplitude Indicates vibration frequency
Indicates mature of vibrations Only indicates second and above harmonics
52. At node of the shaft
The vibrations are minimum The vibrations are maximum
The vibrations are average The vibrations are zero
53. Match list I with list II and select the correct answer using the codes. given below the lists. List I (Match property) List II (Related to)
A. Malleabillity 1. Wire drawing
B. Hardness 2. Impact loads
C. Resilience 3. Cold rolling
D. Isotropy 4. Indentation
5. Direction
ABC D
42 13
34 25
54 23
32 15
54. The cutting speed of the tool in a mechanical shaper is
Maximum at the beginning of the cutting stroke
Maximum at the end of the cutting stroke
Maximum at the middle ofthe cutting stroke
Minimum at the middle ofthe cutting stroke
55. Which is not correct statement about the function of flux in brazing
To avoid thermal distortion and cracking
To dissolve surface oxide coatings which have formed prior to brazing
To prevent oxides from forming during the brazing operation on both the base metal and the brazing material
To facilitate the wetting process by reducing the viscosity of the melt
56. Investment casting is used for
Shapes which are made by difficulty using complex patterns in sand casting
Mass production
Shapes which are very complex and intricate and can't be cast by any other method
There is nothing like investment casting
57. Internal and external threads can be produced on tapered surfaces conveniently by
Universal milling machine Plano miller
Planetary milling machine lathe
....
..
INDIAN SPACE RESEARCH ORGANISATION
. ..... 8 OF 10
2010 MECHANICAL ENGINEERING -II SET-A
l.
58. Optical square is
Engineer's square having stock and blade set at 90°
A constant deviation prism having the angle ofdeviation between the incident ray and reflected ray, equal to 90°
A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to 45°
Used to produce interference fringes
59 A master gauge is
A new gauge
An international reference standard
A standard gauge for checking accuracy of gauges used on shop floors
A gauge used by experienced technicians
60. Dimension of the h 0.02 ole is 50 -0.00 mm an +0.02 d shaft is 50 +0.00 mm . The minimum clearance
is
0.02 mID 0.00 nun -0.02 mm 0.01 mm
61. Two cutters are mounted on the arbor so that two faces are machined simultaneously in
Gang milling Straddle milling Pendulum milling Profile milling
62. The main alloying elements in high speed steel in order of increasing proportion are
Vanadium, chromium, tungsten Tungsten, titanium, vanadium
Chromium, titanium, vanadium Tungsten, chromium, titanium
63. Surface roughness on a drawing is represented by
Triangles Circles Squares Rectangles
64. A husband and wife appear in an interview for two vacancies for same post. The probability of
1 .1
husband getting selected is -while the probability of wife getting selected is Then the
57
probability that anyone of them getting selected is
11121 34 00 35
65. Cylindrical parts are held on planer by
V-blocks and arrestors Angle plates
V-block, T-bolts and clamps T-bolt and clamps
66. Expressing a dimension as 25.3 ±0.05 mm is the case of
Unilateral tolerance Bilateral tolerance
Limiting dimensions All ofthe above
_2010, MECHANICAL ENGINEERING -II SET-A
67. In comparison to an open-loop system a closed loop system is
More stable More accurate More complex All ofthe above
68. The Moody diagram is shown in Fig. The friction factor for turbulent flow in a smooth pipe is given by curve
A B
E C
69. A piping system consists of three pipes arran'ged in series, the lengths of the pipes are 1200m, 750 m and 600 m and diameters 750 mm, 600 mm, 450 mm respectively. Transform the system to an equivalent 450 mm diameter pipe
671.3m 771.3m 871.3m 971.3m
70. Friction drag is generally larger than the pressure drag in
Flow past a Flow past a thin sheet Flow past an Flow past a cylilnder
sphere airfoil
71. If D is the diameter ofimpeller at inlet, W is the width of impeller at inlet and Vf is the velocity of flow at inlet, then discharge through a centrifugal pump is equal to
trDVf DVfw JrDVfw Jd)w
72. Cavitation parameter is defined by
p -p. P-Py P-P p-p
aon
atm
pV2 pV2y
pV2/2
22
73. The maximum thickness of boundary layer in a pipe of radius R is
0.1 R 0.22 R 0.5 R R
74. At a point A in a pipe lilne carrying water, the diameter is 1 the pressure 98 KPa and the
velocity 1m/s. At a point 2 m higher than the diameter is O.5m and the pressure 20 KPa.
The direction offlow would be
A to B B to A Cannot be ascertained from data None ofthese
Page:
INDIAN SPACE RESEARCH ORGANISATION
·10 OF 10
MECHANICAL ENGINEERING -II SET-A
75. In the given figure pressure p ,in kPa, is
37 48.0 45.2 51.3
76. A small plastic boat loaded with pieces of steel rods is floating in a bathtub. If the cargo is dumped into the water allowing the boat to float empty, the water level in the tub will
Rise Fall Not change Rise then fall
77. Four cars, with a mass of 1500 kg each, are loaded on a 6 m wide, 12 m long small car ferry. How far, in em will it sink in the water?
15.2 11.5 10.2 8.3 .
78. Water enters a turbine at 900kPa with negligible velocity. What maximum speed, in mis, can it reach before it enters the turbine rotor?
42 47 45 52
79. Given that: Specific gravity of mercury 13.6; Intensity of pressure 40kPa Express the intensity of pressure (gauge) in various units
0.4 bar, 4.077 m ofwater, 0.299 m of
0.3 bar, 3.077 m of water, 0.15 m ofmercury
mercury
0.5 bar, 5.077 m ofwater, 0.339 m of
None ofthe above mercury
3x B e2x
80. The differential equation satisfying y e is d 2y dy d2y dy
dx2 dx dx2 dx
d
2 d2
d ydy
+6y
dx dx dx2dx
m
1.
If thermal conductivity of a material of wall varies as the temperature at the center of
2.
The spectral emissive power E 1 for a diffusely emitting surface is E 0 for A 3j1m E1 =150 W/m2 J01Z for 3 A 12J01Z E1 =300W/m2 Jfffl for 12 A 25Jfffl; E 0 for A 25Jfffl. The total emissive power of the surface over the entire spectrum is
the wall will be is
Depends on other factors More than that in case ofconstant thermal
conductivity
Less than that in case ofconstant thermal None ofthe above
conductivity
2500 W/m2 4000 W/m2 5250 W/m2
3.
A wire is plastically deformed bent by supplying a force of 40 N over a distance of 0.8 m. (The force moves in the direction in which the distance is measured). If the wire has a mass of 0.2 kg and a specific heat of 0.5 kJ/kg.oC estimate the maximum increase in the average temperature of the wire
4.
Two rods one of length L and the other of length 2L are made of the same material and have the same diameter. The two ends of the longer diameter. The two ends of the longer rod are maintained at 100°C. One end of the shorter rod is maintained at 100° C while the other end is insulated. Both the rods are exposed to the same environment at 40°C. The temperature at the insulated end of the shorter rod is measured to be 55 C. The temperature at the midpoint of the longer rod would be
40°C 50°C 55°C 100°C
5.
A sphere, a cube and a disc all of the same material, quality and volume are heated to 900 K and left in air. Which of these will have the lowest rate of cooling
Cube Disc Sphere All will have the same rate of cooling
6.
Air with initial condition of pl,vl expands to final condition of 3vl. The process is
Hyperbolic Adiabatic Polytropic with n Polytropic with n
7.
Sun's surface at 5800 K emits radiation at a wavelength of 0.5Jl.A furnace at 300° C will emit through a small opening, radiation at a wavelength of
5).1. 0.5).1. 2.5).1. 0.25J.!.
8.
Polytropic index n is given by
IOP,
PI P2 . 2 I
lot:J .lot:] lot:]
Mechanical-II SET-A
..
INDIAN SPACE RESEARCH ORGANISATION Page: 20F 10
MECHANICAL ENGINEERING -II SET-A
9. TheheatflowratethroughparallelwallsofthicknessLb L2andL3andhavingsurface areas A1,A2 and A3 thermal conductivities kl ,k2 and k3 respectively and first and last walls maintained at temperatures tl and t2 will be
10. Which of the following property of air does not increase with rise in temperature? . .. . Thermal Th 1dOffi
SpeCI IC gravIty mematIc VISCOSIty . erma 1 USIVIty
can UCtlVIty
11. Choose the correct figure representing gas to gas heat transfer in parallel flow heat exchanger?
12. The value of Prandtl number for air is about
0.1 0.3 0.7 10.5
13. A body cools from 90° C to 800 C in 5 minutes. Under the same external conditions to cool from 80° C to 70° C the body will take
5 minutes 4 minutes 2.5 minutes More than 5 minutes
14. When the temperature of a solid surface changes from 227° Cto 1227°C, its total emissive power changes from to E,. The ratio will be
3 9 81 Cannot be determined on the basis ofinformation provided
15. Characteristic gas constant of a gas is equal to
IEJIl
INDIAN SPACe ReSEARCH ORGANISATION
10
MECHANICAL ENGINEERING -IT SET-A
16. The matrix
is its own adjoint. The value of x will be
5 3
17. The temperature ofsun can be measured using a
Standard. Radiation Platinum resistance Mercury
thermometer pyrometer thermometer thermometer
18. A car moving with uniform acceleration covers 450 m in a 5 second interval, and covers 700 m in the next 5 second interval. The acceleration of the car is
50 m/s2 25 mls2 10 mls2
19. A particle starts from rest with a constant acceleration
v
••••• ••".
am/sec2 and after some time it decelerates at a uniform
2
rate of f3 m/sec till it comes to rest. If the total time taken
between two rests positions is the maximum velocity
acquired by the particle would be
a+f3
t
f3Jt
22 a+f3 a-f3
20. Two metallic blocks having masses in the ratio 3 are made to slide down a friction less
inclined plane starting initially from rest position. When these blocks reach the bottom of the
inclined plane, they will have their kinetic energies in the ratio
2:3 3:5 3:2 7:4
21. A particle is projected at an angle 8 to the horizontal and it attains a maximum height H. The
time taken by the projectile to reach the highest point, of its path is
JH .J2HsinB
.J.2H
g g smB
22. The tension in the cable supporting a lift moving upwards is twice the tension when the lift
moves downwards. What is the acceleration of the lift?
g/4 g/3 g/2 g
23. For the apparent weight of a body at equator to become zero, the earth should rotate with an
angular velocity of
2 g
V; i
r
..
. 2010. MECHANICAL ENGINEERING -II SET-A
24. A cantilever beam AB of length Land uniform flexural rigidity EI has a bracket A C attached to its free end shown in Fig. Vertical load is applied to the free end C of the bracket. In order that the deflection of point A to be zero the ratio a/L should be
1 12
.!. 2 3 4 3
25. Given that PE the crippling load given by Euler Pc the load at failure due to direct compression PR= the load in accordance with the Rankine's criterion of failure Then PR is given by
(PE +Pc
None ofthe above
2
26. Bending moment M and torque is applied on a solid circular shaft. Ifthe maximum bending
stress equals to maximum shear stress developed, them M is equal to
T
2T 4T
2
27. For solid shaft subjected to a torque of 18000 Nm having a permissible shear stress of 60N/mnl,
the diameter of shaft is
115mm 121mm 149mm l08mm
28. Shear force is
Rate of change ofloading Sum ofbending moments
Rate of change ofbending moment None ofthe above
29. Maximum deflection in cantilever due to pure bending moment M at its end is
Me/2El M12/3El Me/4El M12/6EI
30. Maximum shear stress in Mohr's circle is equal to
Radius ofcircle Diameter ofcircle Center of circle from y-axis Chord ofcircle
MECHANICAL ENGINEERING -II SET-A
31. Hardness of steel depends on
Amount ofcarbon it contains The shape and distribution ofthe carbides in iron
Method offabrication Contents ofalloying elements
32. The modulus of cos a sin a is
.a a
•2 a 1 2a
2cos(c) sm cos
22 2 2
33.
Hardnes of martensite is about 65 RC 48 RC 57 RC 80
34.
Materials after cold working are subjected to following process to relieve stresses
Hot working Tempering Normalizing Annealing
35.
In drop forging the forging is done by
Dropping the workpiece at high velocity
Dropping the hammer at high velocity
Dropping the die with hammer at high velocity
Dropping a weight on hammer to produce requisite impact
36.
Which of the machine tools can be used for boring
1.
Lathe
2.
Drilling machine
3.
Vertical milling machine
4.
Horizontal milling machine
2 and 4 1 and 2
37.
The vernier reading should not be taken at its face value before an actual check has been taken for
Temperature(a) Zero error Its calibration Flatness ofmeasuring jaws equalization
38. High carbon steel carries carbon percentage of
0.1 to 0.3% 0.3 to 0.6% 0.6 to 0.8% 0.8 to 1.5%
39. In order to measure/detect materials by non-destructive testing the method generally used is
Acoustic emission Infrared radiometer
Liquid crystallography Therrnochemic point
40. Shock resisting steels should have
Low wear resistance High wear resistance
Toughness Poor hardenability
Mechanical -II SET-A
-..
2010' MECHANICAL ENGINEERING -II SET-A
..
41. A screw having coeffiCient of friction equal to or greater than the tangent of the load angle is
known as
Machine screw Selflocking screw Set-screws Ball-bearing type screws
42. A bolt is designed with a large factor of safety, on the basis of
Direct tensile stress Direct compressive stress
Direct bending stress Direct shear stress
43. For two springshavil1g same stiffness are in series, the equivalent stiffness would be
k k
k 2k
4 2
44. A material is classified as brittle, if the elongation in a gauge length of 59 mm, is less than
45. In an extra humid atmosphere which one of the following motor would you select?
Open type Semi-protected Drip proof Totally enclosed fan cooled
46. In fillet weld throat is
Perpendicular distance from the root to the hypotenuse
The smaller side oftriangle ofthe fillet
The larger side of triangle of the fillet
None of the above
47. Sensitiveness of a governor is
The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed.
The ratio of the maximum speed to minimum speed within the operating range
The ratio ofthe difference between the maximum and mean speed to that ofminimum to mean speed
The range of variation ofengine speed
48. The value of c which makes the angle 45° between a=i cj and b i j is
1
1 .J2 .J2 0
49. For traction applications, the type of motor best suited is
Induction motor Synchronous motor DC shunt motor DC series motor
50. In simple harmonic motion the acceleration is proportional to
Displacement Linear velocity
Angular velocity Rate of change of angular velocity
MECHANICAL ENGINEERING -II SET-A
51. A vibro meter
Indicates vibration aplitude Indicates vibration frequency
Indicates mature of vibrations Only indicates second and above harmonics
52. At node of the shaft
The vibrations are minimum The vibrations are maximum
The vibrations are average The vibrations are zero
53. Match list I with list II and select the correct answer using the codes. given below the lists. List I (Match property) List II (Related to)
A. Malleabillity 1. Wire drawing
B. Hardness 2. Impact loads
C. Resilience 3. Cold rolling
D. Isotropy 4. Indentation
5. Direction
ABC D
42 13
34 25
54 23
32 15
54. The cutting speed of the tool in a mechanical shaper is
Maximum at the beginning of the cutting stroke
Maximum at the end of the cutting stroke
Maximum at the middle ofthe cutting stroke
Minimum at the middle ofthe cutting stroke
55. Which is not correct statement about the function of flux in brazing
To avoid thermal distortion and cracking
To dissolve surface oxide coatings which have formed prior to brazing
To prevent oxides from forming during the brazing operation on both the base metal and the brazing material
To facilitate the wetting process by reducing the viscosity of the melt
56. Investment casting is used for
Shapes which are made by difficulty using complex patterns in sand casting
Mass production
Shapes which are very complex and intricate and can't be cast by any other method
There is nothing like investment casting
57. Internal and external threads can be produced on tapered surfaces conveniently by
Universal milling machine Plano miller
Planetary milling machine lathe
....
..
INDIAN SPACE RESEARCH ORGANISATION
. ..... 8 OF 10
2010 MECHANICAL ENGINEERING -II SET-A
l.
58. Optical square is
Engineer's square having stock and blade set at 90°
A constant deviation prism having the angle ofdeviation between the incident ray and reflected ray, equal to 90°
A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to 45°
Used to produce interference fringes
59 A master gauge is
A new gauge
An international reference standard
A standard gauge for checking accuracy of gauges used on shop floors
A gauge used by experienced technicians
60. Dimension of the h 0.02 ole is 50 -0.00 mm an +0.02 d shaft is 50 +0.00 mm . The minimum clearance
is
0.02 mID 0.00 nun -0.02 mm 0.01 mm
61. Two cutters are mounted on the arbor so that two faces are machined simultaneously in
Gang milling Straddle milling Pendulum milling Profile milling
62. The main alloying elements in high speed steel in order of increasing proportion are
Vanadium, chromium, tungsten Tungsten, titanium, vanadium
Chromium, titanium, vanadium Tungsten, chromium, titanium
63. Surface roughness on a drawing is represented by
Triangles Circles Squares Rectangles
64. A husband and wife appear in an interview for two vacancies for same post. The probability of
1 .1
husband getting selected is -while the probability of wife getting selected is Then the
57
probability that anyone of them getting selected is
11121 34 00 35
65. Cylindrical parts are held on planer by
V-blocks and arrestors Angle plates
V-block, T-bolts and clamps T-bolt and clamps
66. Expressing a dimension as 25.3 ±0.05 mm is the case of
Unilateral tolerance Bilateral tolerance
Limiting dimensions All ofthe above
_2010, MECHANICAL ENGINEERING -II SET-A
67. In comparison to an open-loop system a closed loop system is
More stable More accurate More complex All ofthe above
68. The Moody diagram is shown in Fig. The friction factor for turbulent flow in a smooth pipe is given by curve
A B
E C
69. A piping system consists of three pipes arran'ged in series, the lengths of the pipes are 1200m, 750 m and 600 m and diameters 750 mm, 600 mm, 450 mm respectively. Transform the system to an equivalent 450 mm diameter pipe
671.3m 771.3m 871.3m 971.3m
70. Friction drag is generally larger than the pressure drag in
Flow past a Flow past a thin sheet Flow past an Flow past a cylilnder
sphere airfoil
71. If D is the diameter ofimpeller at inlet, W is the width of impeller at inlet and Vf is the velocity of flow at inlet, then discharge through a centrifugal pump is equal to
trDVf DVfw JrDVfw Jd)w
72. Cavitation parameter is defined by
p -p. P-Py P-P p-p
aon
atm
pV2 pV2y
pV2/2
22
73. The maximum thickness of boundary layer in a pipe of radius R is
0.1 R 0.22 R 0.5 R R
74. At a point A in a pipe lilne carrying water, the diameter is 1 the pressure 98 KPa and the
velocity 1m/s. At a point 2 m higher than the diameter is O.5m and the pressure 20 KPa.
The direction offlow would be
A to B B to A Cannot be ascertained from data None ofthese
Page:
INDIAN SPACE RESEARCH ORGANISATION
·10 OF 10
MECHANICAL ENGINEERING -II SET-A
75. In the given figure pressure p ,in kPa, is
37 48.0 45.2 51.3
76. A small plastic boat loaded with pieces of steel rods is floating in a bathtub. If the cargo is dumped into the water allowing the boat to float empty, the water level in the tub will
Rise Fall Not change Rise then fall
77. Four cars, with a mass of 1500 kg each, are loaded on a 6 m wide, 12 m long small car ferry. How far, in em will it sink in the water?
15.2 11.5 10.2 8.3 .
78. Water enters a turbine at 900kPa with negligible velocity. What maximum speed, in mis, can it reach before it enters the turbine rotor?
42 47 45 52
79. Given that: Specific gravity of mercury 13.6; Intensity of pressure 40kPa Express the intensity of pressure (gauge) in various units
0.4 bar, 4.077 m ofwater, 0.299 m of
0.3 bar, 3.077 m of water, 0.15 m ofmercury
mercury
0.5 bar, 5.077 m ofwater, 0.339 m of
None ofthe above mercury
3x B e2x
80. The differential equation satisfying y e is d 2y dy d2y dy
dx2 dx dx2 dx
d
2 d2
d ydy
+6y
dx dx dx2dx
m