Important Paper Mechnical Engineering Chapterwise English

Q2. 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

1. 0.25mm
2. 0.5mm

Q3. The bulk modulus of elasticity

1. does not increase with the pressure
2. increases with the pressure

Q4. To express stress-strain relations for a linearaly elastic, homogeneous , isotropic material , minimum number of material constants needed are

1. Two
2. Three

Q5. 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 ?

1. 2 kN/mm²
2. 1 kN/mm²

Q6. One end of a metallic rod is fixed rigidly and its temperature is raised. It will experience

1. zero stress
2. tensile stress

Q7. Select the proper sequence for the following :

1. Proportional limit
2. Elastic limit

Q8. Select the correct answer out of the following alternatives about ‘Cyclic Stresses’

1. That a material can tolerate are much greater than stresses produced under static loading
2. Can lead to fatigue if the stress level is above the endurance limit

Q9. If Mohr’s circle for a state of stress becomes a point, the state of stress is

1. Pure shear state of stress
2. Uniaxial state of stress
3. Identical principal stresses
4. None of the above

Answer: C

Q10. Mohr’s circle may be used to determine following stress on a inclined plane

1. Normal stress
2. Principle stress
3. Tangential stress
4. All of the above

Answer: D