A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

A

45 to 60%

B

63 to 70%

C

70 to 83%

D

80 to 90%

For unequal width of butt straps, the thicknesses of butt straps are

A

0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

B

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside

C

0.75 t for both the straps on the inside and outside

D

0.625 t for both the straps on the inside and outside

Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². If width of plate=80mm and diameter of rivets 10mm, then pitch will be?

A

65mm

B

60mm

C

50mm

D

70mm

Ratio of chemical A and B in boiler Y is 3 : 2 and Boiler X has ratio of chemical A to chemical B as 1 : 7, 16 litres of mixture is removed transferred from boiler X to boiler Y. What is the total capacity of boiler Y if capacity of boiler X is 144 litres and difference between chemical A and B in boiler Y after transfer is 25 litres? Assume that after transferring 16 litres from boiler X, boiler Y is running at full capacity

A

145 litres

B

150 litres

C

175 litres

D

201 litres

E

185 litres

According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

A

d

B

1.5 d

C

2 d

D

2.5 d

Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the pitch of the rivets.

A

None of the listed

B

210mm

C

105mm

D

52.5mm

According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

A

45 to 60%

B

63 to 70%

C

70 to 83%

D

80 to 90%

The rivets in outer row of longitudinal boiler shell butt joint are subjected to double shear.

A

True

B

False

In a riveted joint, when the number of rivets decreases from the inner most row to outer most row, the joint is said to be

A

Chain riveted

B

Zig-zag riveted

C

Diamond riveted

D

None of these

Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the tensile strength of rivets along B-B.

A

84.8kN

B

468.8kN

C

384kN

D

None of the listed

A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

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