ISRO Past Year Paper (Mechanical) - December 2017 - ISRO, GATE & IES/ESE Mechanical Previous Year Solved Papers - Mechanical Engineering

 Page 1


ISRO Scientist or Engineer Mechanical Dec 2017
               
              
               
 
  
.
Page 2


ISRO Scientist or Engineer Mechanical Dec 2017
               
              
               
 
  
.
Mechanical
Instructions
For the following questions answer them individually
Question 1
The most applicable failure theory for metals like Aluminium is
A    Maximum principal stress theory
B    Maximum principal strain theory
C    Total strain energy theory
D    Maximum distortion energy theory
Answer: D
Question 2
Which one of the following is FALSE?
A    Number of Taps generally used for hand tappingis 3
B    Piispanen’s model in machiningis usedto estimate shear strain
C    Chip hammering during machiningis due to improperchip control
D    Cemented carbide tools are generally poor in compression
Answer: D
Question 3
A statistical process control chart which shows the number of defects found in a subgroup of fixed size is
A    C-chart
B    R-chart
C    Control chert
D    Gantt chart
Answer: A
Question 4
Complex irregular three dimensional surfaces can be located using the following method
A    Sighting
B    Nesting
C    Integral locators
D    Buttons
Answer: B
  
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Page 3


ISRO Scientist or Engineer Mechanical Dec 2017
               
              
               
 
  
.
Mechanical
Instructions
For the following questions answer them individually
Question 1
The most applicable failure theory for metals like Aluminium is
A    Maximum principal stress theory
B    Maximum principal strain theory
C    Total strain energy theory
D    Maximum distortion energy theory
Answer: D
Question 2
Which one of the following is FALSE?
A    Number of Taps generally used for hand tappingis 3
B    Piispanen’s model in machiningis usedto estimate shear strain
C    Chip hammering during machiningis due to improperchip control
D    Cemented carbide tools are generally poor in compression
Answer: D
Question 3
A statistical process control chart which shows the number of defects found in a subgroup of fixed size is
A    C-chart
B    R-chart
C    Control chert
D    Gantt chart
Answer: A
Question 4
Complex irregular three dimensional surfaces can be located using the following method
A    Sighting
B    Nesting
C    Integral locators
D    Buttons
Answer: B
  
.
Question 5
The force in member BC of steel truss structure shown in figure below is (Cross section of each member is A, Length of each
member is ‘l')
A    P1 + 2P2
B    2P1 + P2
C    2 * (P1 + P2)
D    (P1 + P2)/2
Answer: C
Question 6
Buckling loads (Pi) of 4 columns of equal length and cross section, but with different end conditions are shown below. Which ofthe
following is TRUE?
A    
B    
C    
D    
Answer: B
p < 1 p < 2 p < 3 p 4
p < 3 p < 1 p < 4 p 2
p < 1 p < 4 p < 2 p 3
p < 3 p < 4 p < 1 p 2
  
.
Page 4


ISRO Scientist or Engineer Mechanical Dec 2017
               
              
               
 
  
.
Mechanical
Instructions
For the following questions answer them individually
Question 1
The most applicable failure theory for metals like Aluminium is
A    Maximum principal stress theory
B    Maximum principal strain theory
C    Total strain energy theory
D    Maximum distortion energy theory
Answer: D
Question 2
Which one of the following is FALSE?
A    Number of Taps generally used for hand tappingis 3
B    Piispanen’s model in machiningis usedto estimate shear strain
C    Chip hammering during machiningis due to improperchip control
D    Cemented carbide tools are generally poor in compression
Answer: D
Question 3
A statistical process control chart which shows the number of defects found in a subgroup of fixed size is
A    C-chart
B    R-chart
C    Control chert
D    Gantt chart
Answer: A
Question 4
Complex irregular three dimensional surfaces can be located using the following method
A    Sighting
B    Nesting
C    Integral locators
D    Buttons
Answer: B
  
.
Question 5
The force in member BC of steel truss structure shown in figure below is (Cross section of each member is A, Length of each
member is ‘l')
A    P1 + 2P2
B    2P1 + P2
C    2 * (P1 + P2)
D    (P1 + P2)/2
Answer: C
Question 6
Buckling loads (Pi) of 4 columns of equal length and cross section, but with different end conditions are shown below. Which ofthe
following is TRUE?
A    
B    
C    
D    
Answer: B
p < 1 p < 2 p < 3 p 4
p < 3 p < 1 p < 4 p 2
p < 1 p < 4 p < 2 p 3
p < 3 p < 4 p < 1 p 2
  
.
Question 7
The bar AB weighs 10 kg per meter and is supported by cable AC and a pin at B. Reaction at B is ( take g = 10 m/s )
A    200 N, vertical
B    200 N, at  to horizontal
C    100 N vertical
D    100 N at  to horizontal
Answer: B
Question 8
Arrange the metals Aluminium, Copper, Iron & Silver in increasing order of thermal conductivity
A    Iron, Aluminium, Copper, Silver
B    Aluminium, Iron, Copper, Silver
C    Copper, Iron, Silver, Aluminium
D    Iron, Copper, Aluminium, Silver
Answer: A
Question 9
Modulus of resilience for the below material is
2
3 0
°
6 0
°
  
.
Page 5


ISRO Scientist or Engineer Mechanical Dec 2017
               
              
               
 
  
.
Mechanical
Instructions
For the following questions answer them individually
Question 1
The most applicable failure theory for metals like Aluminium is
A    Maximum principal stress theory
B    Maximum principal strain theory
C    Total strain energy theory
D    Maximum distortion energy theory
Answer: D
Question 2
Which one of the following is FALSE?
A    Number of Taps generally used for hand tappingis 3
B    Piispanen’s model in machiningis usedto estimate shear strain
C    Chip hammering during machiningis due to improperchip control
D    Cemented carbide tools are generally poor in compression
Answer: D
Question 3
A statistical process control chart which shows the number of defects found in a subgroup of fixed size is
A    C-chart
B    R-chart
C    Control chert
D    Gantt chart
Answer: A
Question 4
Complex irregular three dimensional surfaces can be located using the following method
A    Sighting
B    Nesting
C    Integral locators
D    Buttons
Answer: B
  
.
Question 5
The force in member BC of steel truss structure shown in figure below is (Cross section of each member is A, Length of each
member is ‘l')
A    P1 + 2P2
B    2P1 + P2
C    2 * (P1 + P2)
D    (P1 + P2)/2
Answer: C
Question 6
Buckling loads (Pi) of 4 columns of equal length and cross section, but with different end conditions are shown below. Which ofthe
following is TRUE?
A    
B    
C    
D    
Answer: B
p < 1 p < 2 p < 3 p 4
p < 3 p < 1 p < 4 p 2
p < 1 p < 4 p < 2 p 3
p < 3 p < 4 p < 1 p 2
  
.
Question 7
The bar AB weighs 10 kg per meter and is supported by cable AC and a pin at B. Reaction at B is ( take g = 10 m/s )
A    200 N, vertical
B    200 N, at  to horizontal
C    100 N vertical
D    100 N at  to horizontal
Answer: B
Question 8
Arrange the metals Aluminium, Copper, Iron & Silver in increasing order of thermal conductivity
A    Iron, Aluminium, Copper, Silver
B    Aluminium, Iron, Copper, Silver
C    Copper, Iron, Silver, Aluminium
D    Iron, Copper, Aluminium, Silver
Answer: A
Question 9
Modulus of resilience for the below material is
2
3 0
°
6 0
°
  
.
A    
200 kN/m
B    100 kN/m
C    606.25 kN/m
D    12.29 MN/m
Answer: B
Question 10
Which of the following is FALSE?
A    Heat flow by conduction is directly proportional to the area and temperature gradient
B    Heat flow by convection is directly proportional to the area and temperature difference
C    Heat flow by radiation is directly proportional to the cube of absolute temperature of the radiating body
D    Emissivity of perfect black body is unity
Answer: C
Question 11
Two dimensionally equal blocks made of material M1 and M2 are placed on flat horizontal surface as shown in figure below. Young’s
modulus of the materials are El & E2 resp. A
uniform pressure ‘p’ is applied over the blocks through a thick plate (AB) symmetrically placed over the blocks. For E1 > E2, consider
the statements below.
(p) Stress in both blocks are same
(q) Strain in both blocks are same
(r) Plate AB tilts and point B moves downward
(s) Plate AB tilts and point A moves downward
Which of the above sentencesare correct?
A    p, q & r
B    q & r
C    p & s
D    p & r
Answer: D
Question 12
In tolerancing of a part, unless otherwise specified, individual features of size must
A    
not violate size limits of MMCat anycross section
2
2
2
2
  
.