The effect of twisting moment and shear force on the bolt group cause ____ whereas bending moment and shear force cause ________

Which of the following stresses are associated with the tightening of a nut on a bolt? P. Tensile stress due to the streching of bolt Q. Bending stress due to the bending of bolt R. Torsional shear stress due to frictional resistance between the nut and the bolt Select the correct answer using the codes given below.

A

P and Q

B

P and R

C

Only p

D

R and Q

Which of the following stresses are associated with the tightening of a nut on a bolt? P. Crushing and shear stress in threads Q. Bending stress due to the bending of bolt R. Torsional shear stress due to frictional resistance between the nut and the bolt Select the correct answer using the codes given below:

A

P and Q

B

P and R

C

Only P

D

Only R

When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

A

$$\frac{1}{2}\sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$

B

$$\sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$

C

$$\frac{1}{2}\left( {{\text{M}} + \sqrt {{{\text{M}}^2} + {{\text{T}}^2}} } \right)$$

D

$${\text{M}} + \sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$

A wall bracket is attached to the wall by means of 2 identical bolts, one at A and one at B. The force of 20kN acts at a distance of 400mm. Bolt A lies at a distance of 50mm from axis of tilt and bolt B 500mm. Allowable shear stress in the bolts is 100N/mm² and tensile is 40N/mm². Find the radius of Mohr circle which can be made from the shear stress and tensile stress acting on bolts.(Consider bolt under max stress and area of bolt is A)

A

10000/A N/mm²

B

6378.5/A N/mm²

C

10755.7/A N/mm²

D

None of the listed

A shaft of diameter D is subjected to a twisting moment (T) and a bending moment (M). If the maximum bending stress is equal to maximum shear stress developed, then M is equal to

A

$$\frac{{\text{T}}}{2}$$

B

T

C

2T

D

4T

A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

A

2000 N-m

B

2050 N-m

C

2100 N-m

D

2136 N-m

Consider the following statements regarding typical analysis of bolt failure : 1. 15% failure of bolt occur at the fillet under the head. 2. 50% failure of bolt occur at the end of threads on the shank. 3. 80% failure of bolt occur in the threads that are in contact with the nut. Which of the above statements is/are correct ?

A

1 only

B

3 only

C

2 and 3 only

D

1, 2 and 3

Nominal bearing strength of bolt is 2.5kbdtfu where kb depends on (i) end distance, (ii)pitch distance, (iii)ultimate tensile stress of bolt, (iv)shank area of bolt, (v)yield stress of bolt, (vi)diameter of hole

A

i, ii, iv, v

B

i, ii, iii, vi

C

ii, iii, iv, v

D

iii, iv, v, vi

A reinforced concrete beam is subjected to 5 kNm bending moment due to dead load and 25 kNm bending moment due to live load. What should be the design bending moment for limit state of collapse?

A

30.0 kN.m

B

34.5 kN.m

C

45.0 kN.m

D

50.0 kN.m

A wall bracket is attached to the wall by means of 2 identical bolts, one at A and one at B. The force of 20kN acts at a distance of 400mm. Bolt A lies at a distance of 50mm from axis of tilt and bolt B 500mm. Allowable shear stress in the bolts is 100N/mm² and tensile is 40N/mm². Which bolt is used a criterion for designing?

A

B

C

A or B

D

None of the listed

The effect of twisting moment and shear force on the bolt group cause whereas bending moment and shear force cause ____

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