261. A cast iron designated by FG 300 is
(A) Grey cast iron with carbon content of 3%
(B) Grey cast iron with ultimate compressive strength of 300 N/mm2
(C) Grey cast iron with tensile yield strength of 300 N/mm2
Answer: - Grey cast iron with ultimate tensile strength of 300 N/mm2
262. A bushed pin-type of flange coupling is used
(A) When the shafts are not in exact alignment
(B) For intersecting shafts
(C) For small shafts rotating at slow speeds
(D) For parallel shaft
Answer: - When the shafts are not in exact alignment
263. In involute gears the pressure angle is
(A) Dependent on the size of teeth
(B) Dependent on the size of gears
(C) Always constant
(D) Always variable
Answer: - Always constant
264. In welding joint, it is preferable to design groove joint in such a way that it would be subject to
(A) Tension only
(B) Compression only
(C) Tension or Compression only
(D) Tension and compression simultaneously
Answer: - Tension or Compression only
265. The run way speed of turbine is the speed
(A) At which the turbine will run freely without any load and at full flow
(B) Corresponding to maximum overload
(C) At which there would be no danger to the turbine runner
(D) At full load
Answer: - At which the turbine will run freely without any load and at full flow
266. The “Jominy test” is used to find
(A) Young’s modulus
(B) hardenability
(C) yield strength
(D) thermal conductivity
Answer: - hardenability
The hardenability of a metal alloy is the depth to which a material is hardened after putting it through a heat treatment process. The unit of hardenability is length. It is an indication of how deep into the material a certain hardness can be achieved.
From Wikipedia
267. The part of a gating system which regulates the rate of pouring of molten metal is
(A) pouring basin
(B) runner
(C) choke
(D) ingate
Answer: - choke
268. Creep of belt can be controlled by
(A) Decreasing belt length
(B) Reducing stress in belt
(C) Increasing center distance
(D) Reducing belt velocity
Answer: - Reducing stress in belt
269. The piston pin bearings in heavy duty diesel engines are
(A) Needle roller bearings
(B) Tapped roller bearings
(C) Spherical roller bearings
(D) Cylindrical roller bearings
Answer: - Needle roller bearings
270. A bar of copper and steel form a composite system which is heated through a temperature of 40° C. The stress induced in the copper bar is
(A) Tensile
(B) Compressive
(C) Both tensile and compressive
(D) Shear
Answer: - Compressive
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