MCQs Mechanical Engineering

1. On the application of a given load the length of a wire is stated to increase by 1mm. If the same force is now applied to a wire of same material but of the length and radius twice the first, the extension produced would be
(a)0.25mm
(b)0.5mm
(c )2.0mm
(d)4.0mm
Ans. B
2. The bulk modulus of elasticity
(a) does not increase with the pressure
(b) increases with the pressure
(c ) is large when fluid is more compressible
(d) is independent of pressure and viscosity
Ans. A
3. To express stress-strain relations for a linearaly elastic, homogeneous , isotropic material , minimum number of material constants needed are
(a) Two
(b) Three
(c ) Four
(d) One 
Ans. C
4. A tension member with a cross-sectional area of 30mn² resists a load of 60kN. What is the normal stress induced on the plane of maximum shear stress ?
(a) 2 kN/mm²
(b) 1 kN/mm²
(c ) 4 kN/mm²
(d)3 kN/mm²
Ans. A
5. One end of a metallic rod is fixed rigidly and its temperature is raised. It will experience
(a) zero stress
(b) tensile stress
(c ) compressive stress 
(d) None of the above 
Ans. B
6. Select the proper sequence for the following :
(a) Proportional limit
(b) Elastic limit 
(c ) Yield point 
(d) Fracture /failure point
Ans. A
7. Select the correct answer out of the following alternatives  about ‘Cyclic Stresses’
(a) That a material can tolerate are much greater than stresses produced under static loading
(b) Can lead to fatigue if the stress level is above the endurance limit
(c ) Can lead to fatigue if the stress level is below the endurance limit
(d) Are not introduced in the axle of a running train
Ans. C
8. If Mohr’s circle for a state of stress becomes a point, the state of stress is
(a) Pure shear state of stress
(b) Uniaxial state of stress
(c) Identical principal stresses 
(d) None of the above 
Ans. C
9. Mohr’s circle may be used to determine following stress on a inclined plane
(a)  Normal stress
(b)Principle stress
(c) Tangential stress
(d)  All of the above
Ans. D
10. There is a two dimensional fluid element which depicts the properties of a rigid body while rotating , during the rotation a point is taken inside the element having pressure of one unit. Find out the radius of Mohr’s circle at the given instance of time.
(a)  0.5 unit 
(b) 0 unit
(c) 1 unit
(d) 2 unit 
Ans. B
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