Important Question Mechnical Engineering

Q1. The bending moment diagram for a simply supported beam with a load at the mind –span is a

1. parabola
2. hyperbola
3. rectangle
4. triangle

Answer: D

Q2. A beam is of rectangular section, the distribution of shearing stress across a section is

1. Parabolic
2. Rectangular

Q3. Point of contraflexure is where

1. B. M. is maximum
2. S.F. is maximum

Q4. The point of contraflexure occurs in :

1. Cantileve beams
2. Simply supported beams

Q5. In a beam when shear force changes sign, the bending moment will be :

1. Zero
2. Maximum

Q6. A cable with uniformly distributed load per horizontal metre run will take the following shape :

1. Straight line
2. Parabola

Q7. If load at the free end of the cantilever beam is gradually increased failure will occur at :

1. In the middle of beam
2. At the fixed end

Q8. The ratio of the polar moment of inertia to the radius of the shaft is known as

1. Shaft stiffness
2. Flexural rigidity
3. Torsional rigidity
4. Torsional section modulus

Answer: D

Q9. In theory of simple bending of beams, which one of the following assumptions is incorrect ?

1. Elastic modulus in tension and compression are same for the beam materials .
2. Plane sections remain plane before and after bending

Q10. The flexural rigidity of a beam is

1. EI
2. E/I