Code No: R2031032 R20 SET - 1
II B. Tech I Semester Regular Examinations, Dec/Jan – 2022-23
III
DESIGN OF MACHINE MEMBERS - I
(Mechanical Engineering)
Time: 3 hours Max. Marks: 70
Answer any FIVE Questions ONE Question from Each unit
All Questions Carry Equal Marks
*****
UNIT-I
1. a) Discuss various general considerations in Machine Design. [7M]
b) Define (i)) Basic Size, ((ii)Allowance, (iii)) Tolerance and (iv)Mean
( [7M]
deviation
(OR)
2. a) What is factor of safety? Discuss abou
aboutt various factors involving [7M]
in factor of safety.
b) A mild steel shaft of 50 mm diameter is subjected to a bending [7M]
moment of 2000 N N-m
m and a torque T. If the yield point of the
steel in tension is 200 MPa, find the maximum value of this
torque withoutt causing yielding of the shaft according to i) the
maximum principal stress and ii) the maximum shear stress.
UNIT-II
3. a) What is stress concentration factor? Discuss the causes of stress [6M]
concentration.
b) A non-rotating
rotating shaft supportin
supporting a load of 2.5 kN is shown in [8M]
Figure.. The shaft is made of brittle material, with an ultimate
tensile strength of 300 N/mm2. The factor of safety is 3 and
theoretical stress concentration factor is 1.61. Determine the
dimensions of the shaft.
Figure
(OR)
4. a) Explain the modified Goodman diagram for bending stresses. [6M]
b) A machine component is subjected to two
two-dimensional
dimensional stresses. [8M]
The tensile stress in the X direction varies from 40 to 100
N/mm2 while the tensile stress in the Y directi
direction
on varies from 10
to 80 N/mm2. The frequency of variation of these stresses is
equal. The corrected endurance limit of the component is 270
N/mm2. The ultimate tensile strength of the material of the
component is 660 N/mm2. Determine the factor of safety used u
by the designer.
1 of 3
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, Code No: R2031032 R20 SET - 1
UNIT-III
5. a) A steel plate subjected to a force of 5 kN and fixed to a channel [10M]
by means of three ididentical bolts is shown in Figure.. The bolts
are made from plain carbon steel 45C8 (Syt = 380 N/mm2) and
the factor
tor of safety is 3. Specify the size of bolts. (Syt=yield
strength)
Figure
b) hat is bolted joint? List out the advantages and disadvantages
What [4M]
of bolted joints.
(OR)
6. a) A bracket is attached to a horizontal column by means of three [7M]
identical
ntical rivets as shown in Figure
Figure.. The maximum permissible
shear stress for the rivets is 60 N/mm2. (i)Which rivet is
subjected to maximum shear force? (ii) What is the magnitude of
maximum force? (iii) Determine the diameter of rivet.
Figure
b) Itt is required to design a square key for fixing a gear on a shaft [7M]
of 25 mm diameter. The shaft is transmitting 15 kW power at
720 rpm to the gear. The key is made of steel 50C4 (Syt = 460
N/mm2) and the factor of safety is 3. For key material, the yield
strength
rength in compression can be assumed to be equal to the yield
strength in tension. Determine the dimensions of the key.
UNIT-IV
7. a) Discuss about equivalent torsional moment and equivalent [7M]
bending moment.
b) A propeller shaft is required to transmit 50 kW power at 600 [7M]
rpm. It is a hollow shaft, having an inside diameter 0.8 times of
the outside diameter. It is made of steel (Syt = 380 N/mm2) and
the factor of safety is 4. Calculate the inside and outside
diameters of the shaft. Assume (Ssy = 0.5Syt)
(OR)
2 of 3
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II B. Tech I Semester Regular Examinations, Dec/Jan – 2022-23
III
DESIGN OF MACHINE MEMBERS - I
(Mechanical Engineering)
Time: 3 hours Max. Marks: 70
Answer any FIVE Questions ONE Question from Each unit
All Questions Carry Equal Marks
*****
UNIT-I
1. a) Discuss various general considerations in Machine Design. [7M]
b) Define (i)) Basic Size, ((ii)Allowance, (iii)) Tolerance and (iv)Mean
( [7M]
deviation
(OR)
2. a) What is factor of safety? Discuss abou
aboutt various factors involving [7M]
in factor of safety.
b) A mild steel shaft of 50 mm diameter is subjected to a bending [7M]
moment of 2000 N N-m
m and a torque T. If the yield point of the
steel in tension is 200 MPa, find the maximum value of this
torque withoutt causing yielding of the shaft according to i) the
maximum principal stress and ii) the maximum shear stress.
UNIT-II
3. a) What is stress concentration factor? Discuss the causes of stress [6M]
concentration.
b) A non-rotating
rotating shaft supportin
supporting a load of 2.5 kN is shown in [8M]
Figure.. The shaft is made of brittle material, with an ultimate
tensile strength of 300 N/mm2. The factor of safety is 3 and
theoretical stress concentration factor is 1.61. Determine the
dimensions of the shaft.
Figure
(OR)
4. a) Explain the modified Goodman diagram for bending stresses. [6M]
b) A machine component is subjected to two
two-dimensional
dimensional stresses. [8M]
The tensile stress in the X direction varies from 40 to 100
N/mm2 while the tensile stress in the Y directi
direction
on varies from 10
to 80 N/mm2. The frequency of variation of these stresses is
equal. The corrected endurance limit of the component is 270
N/mm2. The ultimate tensile strength of the material of the
component is 660 N/mm2. Determine the factor of safety used u
by the designer.
1 of 3
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, Code No: R2031032 R20 SET - 1
UNIT-III
5. a) A steel plate subjected to a force of 5 kN and fixed to a channel [10M]
by means of three ididentical bolts is shown in Figure.. The bolts
are made from plain carbon steel 45C8 (Syt = 380 N/mm2) and
the factor
tor of safety is 3. Specify the size of bolts. (Syt=yield
strength)
Figure
b) hat is bolted joint? List out the advantages and disadvantages
What [4M]
of bolted joints.
(OR)
6. a) A bracket is attached to a horizontal column by means of three [7M]
identical
ntical rivets as shown in Figure
Figure.. The maximum permissible
shear stress for the rivets is 60 N/mm2. (i)Which rivet is
subjected to maximum shear force? (ii) What is the magnitude of
maximum force? (iii) Determine the diameter of rivet.
Figure
b) Itt is required to design a square key for fixing a gear on a shaft [7M]
of 25 mm diameter. The shaft is transmitting 15 kW power at
720 rpm to the gear. The key is made of steel 50C4 (Syt = 460
N/mm2) and the factor of safety is 3. For key material, the yield
strength
rength in compression can be assumed to be equal to the yield
strength in tension. Determine the dimensions of the key.
UNIT-IV
7. a) Discuss about equivalent torsional moment and equivalent [7M]
bending moment.
b) A propeller shaft is required to transmit 50 kW power at 600 [7M]
rpm. It is a hollow shaft, having an inside diameter 0.8 times of
the outside diameter. It is made of steel (Syt = 380 N/mm2) and
the factor of safety is 4. Calculate the inside and outside
diameters of the shaft. Assume (Ssy = 0.5Syt)
(OR)
2 of 3
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