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ISRO Mechanical Exam: Machine Design Quiz
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Question 1
A 4 meter long solid circular cylindrical shaft transmits 1600 kW at 500 rpm. The endurance limit of the material is 210 MPa and a factor of safety of 3 is to be used with respect to fatigue failure. Use G = 77.5 GPa. The design diameter ‘D’ of the shaft in metre is
Question 2
Consider the following statements in respect of flexible couplings
1). the flanges of flexible coupling are usually made of grey cast iron FG200.
2). In the analysis of flexible coupling, it is assumed that the power is transmitted by the shear resistance of the pins.
3). Rubber bushes with brass lining are provided to absorb misalignment between the two shaft.
Which of these statements are correct?
1). the flanges of flexible coupling are usually made of grey cast iron FG200.
2). In the analysis of flexible coupling, it is assumed that the power is transmitted by the shear resistance of the pins.
3). Rubber bushes with brass lining are provided to absorb misalignment between the two shaft.
Which of these statements are correct?
Question 3
Fatigue strength of a rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral force. What is the reason?
Question 4
A spring with 25 active coils cannot be accommodated within a given space. Hence 5 coils of the spring are cut. What is the stiffness of the new spring____?
Question 5
Match List-I (part to be Joined) with List-II (Type of Joint) and select the correct answer using the code given below the lists:
List-I
A). Two rods having relative axial motion
B). Strap end of the connecting rod
C). Piston rod and cross head
D). Links of four-bar chain
List-II
1). Pin joint
2). Knuckle Joint
3). Gib and Cotter Joint
4). Cotter Joint
List-I
A). Two rods having relative axial motion
B). Strap end of the connecting rod
C). Piston rod and cross head
D). Links of four-bar chain
List-II
1). Pin joint
2). Knuckle Joint
3). Gib and Cotter Joint
4). Cotter Joint
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