# A test specimen is stressed slightly beyond the yield point and then unloaded. Its yield strength will

1.  Decrease

2.   Increase

3.  remains same

4.   becomes equal to ultimate tensile strength

4

Increase

Explanation :
No Explanation available for this question

# A ball A of mass m fills under gravity from a height h and strikes another ball B of mass m which is supported at rest on a spring of stiffness k. Assume perfectly elastic impact. Immediately after the impact

1.  The velocity of ball A is 1/2√2gh

2.  The velocity of ball A is zero

3.  The velocity of both balls is -1/2√2gh

4.  none of the above

4

The velocity of ball A is zero

Explanation :
No Explanation available for this question

# A key connecting a flange coupling to a shaft is likely to fail in

1.   Shear

2.  Tension

3.  Torsion

4.   Bending

4

Shear

Explanation :
No Explanation available for this question

# A frere bar of length 1 uniformly heated from 0°C to a temperature t°C. a is the coefficient of linear expansion and E is the modulus of elasticity. The stress in the bar is

1.  α tE

2.  α tE/2

3.  zero

4.  None of the above

4

zero

Explanation :
No Explanation available for this question

# The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to

1.  Shear force and bending moment

2.    Axial force

3.  Torsion

4.   Torsion and bending moment

4

Shear force and bending moment

Explanation :
No Explanation available for this question

# A wheel of mass m and radius r is in accelerated rolling motion without slip under a steady axle torque T. If the coefficient of kinetic friction is µ, Ihe friction force (nun liic ground on the wheel is

1.  µ mg

2.  T/r

3.  Zero

4.  None of the above

4

µ mg

Explanation :
No Explanation available for this question

# In spur gears, the circle on which the involute is generated is called the

1.  Pitch circle

2.    Clearance circle

3.  Base circle

4

Pitch circle

Explanation :
No Explanation available for this question

# Among the following, the pair of vectors orthogonal to each other is

1.   [3, 4, 7], [3, 4, 7]

2.  [1, 0, 0], [1, 1, 0]

3.  [1, 0, 2], [0, 5, 0]

4.  [1, 1, 1], [-1, -1, -1]

4

[1, 0, 2], [0, 5, 0]

Explanation :
No Explanation available for this question

# The specific heat of an ideal gas depend on its

1.  Temperature

2.  Pressure

3.  Volume

4.  Molecular weight and structure

4

Temperature

Explanation :
No Explanation available for this question

# The function f(x) = x3 - 6x2 + 9x + 25 has

1.  a maxima at x = 1 and a minima at x = 3

2.  a maxima at x = 3 and a minima at x = 1

3.  no maxima, but a minima at x = 3

4.  a maxima at x = 1, but no minima

4