42.

78.

74.

75.

76.

77.

78.

१9.

If the balancing mass of a locomotive wheel is 15 kg acting at a radiua of 0.7 m when the
wheel has dead weight of 110 kg, the limiting rotational speed of the wheel in rad/sec to avoid
lifting from rails is close to :

കു 71 B) 6.6
യ 97 (1) 84
The crystal structure of austenite is :
(५) Body centered cubic (B) Face centered cubic
(C) Hexagonal closed packed (D) Body centered tetragonal

The maximum enexgy that can be absorbed per unit volume without ereating 'a permanent
distortion in a material is known as : _

(ക Modulus of resilience (0) Modulus of toughness

(ര Modulus of rupture (D) Modulus of rigidity

A stainless 81001 rod of 10 mm diameter id being reduced to 9 mm by turning on a lathe. If
the spindle rotates at 360 rpm and the tool travel rate is 175 mm/min, the niaterial removal
rate in mm%¥min is close to

(A) 6 (B) 8
(C) 4 (D) 9
The welding processes which uses non-consumable electrode 15 :
(A) Gas metal arc welding (B) Submerged arc welding
(C) Gas tungsten arc welding (D) Flux coated arc welding
Internal gear cutting operation can be performed by :
(4) Milling (8) Hobbing
(€) Shaping with pinion cutter (D) Shaping with rack cutter

For a damped vibrating system, when the critical damping coefficient is less than the
damping coefficient, the system is said to be :

(ക) Under-damped (ए) Over-damped

(C) Critically-damped (D) Undamped

If two nodes are observed at a frequency of 1200 rpm during whirling of a simply supported
long slender rotating shaft, the first critical speed of the shaft in rpm is.

(ക 1800 1 400
(¢ 600 യ) 2400

A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is
increased by 1%, with the internal pressure remaining the same, the percentage change in
the hoop stress is.

(4) 1 (B) 1.28

© 3 © ೩

028/2016 12 A