PGCET Mechanical Question Paper - 2018 with Answer Key

PGCET Mechanical Question Paper - 2018 with Answer Key

126) Circular scale of the micrometer is marked on

Answer is:

anvil

127) For turning alloy steel at cutting speeds of 64 m/min and 100 m/min, the respective tool lives are 20 min and 12 min. The tool life for cutting speed of 144 m/min is

Answer is:

7.9 min

128) Arc welding is performed with welding current of 400 A, voltage of 20 V and weld speed of 10 m/min. If heat transfer efficiency from the arc to weld pool is 90%, heat input per unit length (kJ/mm) is;

Answer is:

43.2

129) The percentage change in cutting speed required to reduce tool life by 50% when value of tool life exponent n=0.125 is;

Answer is:

9

130) A round billet made of brass is to be extruded (extrusion constant = 250 Mpa) at 800 degree centigrade. The billet diameter is 100 mm and the diameter of the extrusion is 20 mm. The extrusion force required (in MN) is;

Answer is:

6.32