Practice Test: Question Set - 03
1. The yield moment of a cross section is defined as the moment that will just produce the yield stress in
- (A) The outer
most fibre of the section
- (B) The inner
most fibre of the section
- (C) The
neutral fibre of the section
- (D) The fibre everywhere
2. If Ix and Iy are the moments of inertia of a section about X and Y axes, the polar moment of inertia of the section, is
- (A) (IX + IY)/2
- (B) (IX - IY)/2
- (C) IX + IY
- (D) (IX/IY)
3. A simply supported beam carries varying load from zero at one end and w at the other end. If the length of the beam is a, the maximum bending moment will be
- (A) wa/27
- (B) wa2/27
- (C) w2a/√27
- (D) wa2/9√3
4. The forces acting on the bar as shown in the given figure introduce
- (A) Compressive
stress
- (B) Tensile
stress
- (C) Shear stress
- (D) None of
these
5. If E, N, K and 1/m are modulus of elasticity, modulus of rigidity. Bulk modulus and Poisson ratio of the material, the following relationship holds good
- (A) E = 3K
(1 - 2/m)
- (B) E = 2N
(1 + 1/m)
- (C) (3/2)K (1 - 2/m) = N (1 + 1/m)
- (D) All the
above
6. Gradually applied static loads do not change with time their
- (A) Magnitude
- (B) Direction
- (C) Point
of application
- (D) All the
above
7. The tangential component of stress on an plane inclined θ° to the direction of the force, may be obtained by multiplying the normal stress by
- (A) sin θ
- (B) cos θ
- (C) tan θ
- (D) sin2θ
8. A body is said to be in equilibrium if
- (A) It
moves horizontally
- (B) It
moves vertically
- (C) It rotates
about its C.G.
- (D) None of
these
9. Pick up the incorrect statement from the following: The torsional resistance of a shaft is directly proportional to
- (A) Modulus
of rigidity
- (B) Angle of
twist
- (C) Reciprocal
of the length of the shaft
- (D) Moment
of inertia of the shaft section
10. The forces acting normally on the cross section of a bar shown in the given figure introduce
- (A) Compressive
stress
- (B) Tensile
stress
- (C) Shear stress
- (D) None of
these
11. A material is said to be perfectly elastic if
- (A) It regains
its original shape on removal of the load
- (B) It regains
its original shape partially on removal of the load
- (C) It does not
regain its original shape at all
- (D) None of
these
12. A shaft rotating N.R.M. under a torque T, transmits a power
- (A) TπN/30 Newton meters/sec
- (B) TπN/30 Newton meters/min
- (C) TπN/60 Newton meters/min
- (D) TπN/60 Newton meters/sec
13. If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:
- (A) Q = S + F
- (B) Q = S - F
- (C) Q = F - S
- (D) Q = S × F
14. The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity EI, is
- (A) WL2/2EI
- (B) WL2/3EI
- (C) WL3/2EI
- (D) WL3/3EI
15. Pick up the correct statement from the following:
- (A) For a
uniformly distributed load, the shear force varies linearly
- (B) For a
uniformly distributed load, B.M. curve is a parabola
- (C) For a load
varying linearly, the shear force curve is a parabola
- (D) All the
above
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