# A flywheel connected to a punching machine has to supply energy of 400 Nm while running at a mean angular speed of 20 rad/s. If the total fluctuation speed o f 20 rad/s. If the total fluctuation of speed is not to exceed ±2%, the mass moment of inertia of the flywheel in kfm2 is

1.  25

2.  50

3.  100

4.  125

4

25

Explanation :
No Explanation available for this question

# If two nodes are observed at a frequency of 1800 rpm during whirling of a simply supported long slender rotating shaft, the first critical speed of the shaft in rpm is

1.  200

2.  450

3.  600

4.  900

4

200

Explanation :
No Explanation available for this question

# A single degree of freedom system having mass 1kg and stiffness 10kN/m initially at rest is subjected to an impulse force of magnitude 5 kN for 10-4 seconds. The amplitude in mm of the resulting free vibration is

1.  0.5

2.   1.0

3.  5.0

4.  10.0

4

5.0

Explanation :
No Explanation available for this question

# Instantaneous centre of a body rolling with sliding on a stationary curved surface lies

1.  At the point of contact

2.  On the common normal tangent at the point of contact

3.  On the common tangent at the point of contact

4.  At the centre of curvature of the stationary surface

4

On the common normal tangent at the point of contact

Explanation :
No Explanation available for this question

# If F= 1KN, magnitude of the vertical reaction force developed at the point B in KN is

1.  0.63

2.  0.32

3.  1.26

4.  1.46

4

0.63

Explanation :
No Explanation available for this question

# The maximum force F in KN that can be applied at C such that the axial stress in any of the truss members DOES NOT exceed 100 MPsa is

1.   8.17

2.  11.15

3.  14.14

4.  22.30

4

11.15

Explanation :
No Explanation available for this question

# A linearly elastic and perfectly plastic material is loaded slightly above the proportional limit. This will lead to

1.  Fracture

2.  Small deformation

3.   Large deformation

4.  Cracking

4

Large deformation

Explanation :
No Explanation available for this question

# Structural constituents of equilibrium cooling of plain carbon steel (0.4%C) at room temperatures are

1.  Austinite and ferrite

2.  Ferrite and pearlite

3.   Cementite and pearlite

4.  Ferrite and martensite

4

Ferrite and pearlite

Explanation :
No Explanation available for this question

# A steel with higher hardenability primarily enables the following to be achieved

1.  Higher hardness at the surface

2.  Greater depth of hardening

3.  Lower depth of hardening

4.  Reduced soucking time

4

Greater depth of hardening

Explanation :
No Explanation available for this question

# Hardness of piece of brass can be increased by

1.  Pack carburizing

2.  Induction hardening

3.  Cold working

4.  Nitriding

4