Home
Current Affairs January 2024

What is the correct answer?

4

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?

A. There are four rivets per pitch length, all in double shear

B. There are four rivets per pitch length, out of which two are in single shear and two are in double shear

C. There are five rivets per pitch length, all in double shear

D. There are five rivets per pitch length, out of which four are in double shear and one is in single shear

Correct Answer :

D. There are five rivets per pitch length, out of which four are in double shear and one is in single shear


Related Questions

What is the correct answer?

4

The building up of worn and undersized parts, subjected to repeated loads by electroplating is

A. Best method

B. Extremely hazardous

C. Has no effect as regards fatigue strength

D. Cheapest method

What is the correct answer?

4

Multiple threads are used to secure

A. Low efficiency

B. High efficiency

C. High load lifting capacity

D. High mechanical advantage

What is the correct answer?

4

When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

A. F/bh

B. 3F/2bh

C. 2F/bh

D. 4F/bh

What is the correct answer?

4

If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

A. 124 d

B. 138 d

C. 151 d

D. 168 d

What is the correct answer?

4

The spring mostly used in gramophones is

A. Helical spring

B. Conical spring

C. Flat spiral spring

D. Volute spring

What is the correct answer?

4

The centre distance between two meshing involute gears is equal to

A. (Sum of base circle radii)/cosφ

B. (Difference of base circle radii)/cosφ

C. (Sum of pitch circle radii)/cosφ

D. (Difference of pitch circle radii)/cosφ

What is the correct answer?

4

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A. d

B. 1.5 d

C. 2.5 d

D. 2 d

What is the correct answer?

4

At low temperatures (say 75°C) the notched bar impact value of steel

A. Increases markedly

B. Decreases markedly

C. Remain same

D. Depends on heat treatment carried out

What is the correct answer?

4

Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

A. (k₁ k₂)/ (k₁ + k₂)

B. (k₁ - k₂)/ (k₁ + k₂)

C. (k₁ + k₂)/ (k₁ k₂)

D. (k₁ - k₂)/ (k₁ k₂)

What is the correct answer?

4

In a journal bearing, the load on the bearing is __________ to the axis of the journal.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

What is the correct answer?

4

For steel, the ultimate strength in shear as compared to ultimate strength in tension is

A. 1/2

B. 1/3

C. 1/4

D. 2/3

What is the correct answer?

4

When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

A. Compression

B. Tension

C. Shear

D. Combined loads

What is the correct answer?

4

Screws used for power transmission should have

A. Very fine threads

B. High efficiency

C. Low efficiency

D. Strong teeth

What is the correct answer?

4

The permissible stress for carbon steel under static loading is generally taken as

A. 2000-3000 kg/m²

B. 3000-4000 kg/cm²

C. 4000-4500 kg/cm²

D. 7500-10,000 kg/cm²

What is the correct answer?

4

The number of slots in a 25 mm castle nut is

A. 8

B. 4

C. 2

D. 6

What is the correct answer?

4

Stress concentration is caused due to

A. Variations in load acting on a member

B. Variations in properties of materials in a member

C. Abrupt change of cross-section

D. All of these

What is the correct answer?

4

Wire ropes as compared to cotton ropes

A. Are lighter in weight

B. Offer silent operation

C. Can withstand shock loads

D. All of these

What is the correct answer?

4

When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

A. Brown colour

B. Yellow colour

C. White colour

D. Grey colour

What is the correct answer?

4

Which is positive drive?

A. Flat belt drive

B. V-belt drive

C. Crossed belt drive

D. Timing belt

What is the correct answer?

4

A type of brake commonly used in motor cars is a

A. Shoe brake

B. Band and block brake

C. Band brake

D. Internal expanding brake

What is the correct answer?

4

The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

A. One-fourth

B. One-third

C. One-half

D. Double

What is the correct answer?

4

Auto frettage is the method of

A. Joining thick cylinders

B. Calculating stresses in thick cylinders

C. Pre-stressing thick cylinders

D. Increasing the life of thick cylinders

What is the correct answer?

4

The number of slots in a 25 mm castle nut is

A. 8

B. 6

C. 4

D. 2

What is the correct answer?

4

The notch angle of the Izod impact test specimen is

A. 10°

B. 20°

C. 30°

D. 45°

What is the correct answer?

4

The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

A. Reducing stress concentration

B. Ease of manufacture

C. Safety

D. Fullering and caulking

What is the correct answer?

4

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

A. Increase the key length

B. Increase the key depth

C. Increase the key width

D. Decrease the key length

What is the correct answer?

4

According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

A. (π/4) d² × τ × n

B. 1.875 × (π/4) d² × τ × n

C. 2 × (π/4) d² × τ × n

D. 3 × (π/4) d² × τ × n

What is the correct answer?

4

Lewis form factor for 14 ½° composite and full depth involute system is (where T = Number of teeth)

A. 0.124 - (0.684/T)

B. 0.154 - (0.912/T)

C. 0.175 - (0.841/T)

D. None of these

What is the correct answer?

4

The draw of cotter should not be more than

A. 3 mm

B. 6 mm

C. 8 mm

D. 12 mm

What is the correct answer?

4

The helix angle for double helical gears may be made up to

A. 45°

B. 60°

C. 75°

D. 90°