# A loaded semi-infinite flat plat is having an elliptical hole (A/B = 2) in the middle as shown in the figure. The stress concentration factors at points either X or Y is

1.  1

2.  3

3.  5

4.  7

4

7

Explanation :
No Explanation available for this question

# A transmission shaft subjected to bending loads must be designed on the basis of

1.  Maximum normal stress theory

2.  Maximum shear stress theory

3.  Maximum normal stress and maximum shear stress theories

4.  Fatigue strength

4

Maximum normal stress theory

Explanation :
No Explanation available for this question

# Determine the minimum value of the basic dynamic load rating for selecting ball bearing to 5000 hrs of operations with not more than 10 % failures. The radial load is 1800 N during 90 % of the time and 7200 N during the remaining 10 %. The sheet is rotated at 150 rev/min

1.  12.45 kN

2.  25 kN

3.  13.45 kN

4.  14.25 kN

4

12.45 kN

Explanation :
No Explanation available for this question

# In a belt-drive if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

1.  Increase the key length

2.  Increase the key depth

3.  Increase the key width

4.  Decrease the key length

4

Increase the key width

Explanation :
No Explanation available for this question

# In the assembly of pulley, key and shaft

1.  Pulley is made the weakest

2.  Key is made the weakest

3.  Key is made the strongest

4.  All the three are designed for equal strength

4

Explanation :
No Explanation available for this question

# A circular shaft can transmit a torque of 5 kNm. If the torque is reduced to 4 kNm, then the maximum value of bending moment that can be applied to the shaft is

1.  1 kNm

2.  2 kNm

3.  3 kNm

4.  4 kNm

4

3 kNm

Explanation :
No Explanation available for this question

# The shock absorbing capacity of a bolt can be increased by

1.  Tightening it properly

2.  Increasing shank diameter

3.  Grinding the shank

4.  Using washer

4

Grinding the shank

Explanation :
No Explanation available for this question

# To resist breaking of the plate in front of the rivet, we make the distance from the centre of the rivet to the edge of the plate at least

1.  1.5 d

2.  2.5 d

3.  2 d

4.  3 d

4

1.5 d

Explanation :
No Explanation available for this question

# The longitudinal joint in a boiler shell is usually

1.  Butt joint

2.  Lap joint

3.  Butt joint with two covers plates

4.  Butt joint with single cover plate

4

Butt joint with two covers plates

Explanation :
No Explanation available for this question

1.  550

2.  600

3.  200

4.  580

4