61. Which of the following is used for bearing liner?
(A) Gun metal
(B) Bronze
(C) Brass
(D) Babbit metal
Answer: - Babbit metal
Babbitt, also called Babbitt metal or bearing metal, is any of several alloys used for the bearing surface in a plain bearing.
(Text credit: - Wikipedia)
62. Normalizing operation is carried out in
(A) Furnace
(B) Air
(C) Water
(D) Oil
Answer: - Air
Normalizing is a thermal process often associated with forgings. In addition, by normalizing process you can reduce internal stresses induced by such operations as forging, casting, machining, forming or welding.
63. Least shrinkage allowance is provided in the case of following
(A) Brass
(B) Aluminium
(C) Cast iron
(D) Steel
Answer: - Brass
Solid shrinkage is the reduction in volume during the cooling of the cast metal. Shrinkage allowance considers only the solid shrinkage. The liquid shrinkage is accounted for by risers.
(Text credit: - Wikipedia)
64. A 20 tonne press implies that the
(A) Weight of press is 20 tonnes
(B) Press can handle works weighing up to 20 tonnes
(C) It can exert pressure upto 20 tonnes
(D) Its foundation should be designed for 20 tonnes
Answer: - It can exert pressure upto 20 tonnes
65. Cutting and forming operations can be done in a single operation on
(A) Simple die
(B) Progressive die
(C) Compound die
(D) Combination die
Answer: - Combination die
66. Upsetting or cold heading is
(A) Rolling process
(B) Extruding process
(C) Bending process
(D) Forging process
Answer: - Forging process
67. No lubricant is required when cutting threads in
(A) Tungsten carbides
(B) Mild steel
(C) Titanium
(D) Brass or cast iron
Answer: - Brass or cast iron
68. In transformer steel, the element which provides the required property is
(A) Manganese
(B) Silicon
(C) Nickel
(D) Chromium
Answer: - Silicon
69. Self-ignition temperature of diesel as compared to petrol is
(A) Higher
(B) Lower
(C) Same
(D) Vary considerable
Answer: - Lower
Self ignition temperature of petrol is 247–280°C. Self ignition temperature of diesel is around 210°C.
70. Which of the following effects is more dangerous for a ship ?
(A) Rolling
(B) Waving
(C) Pitching
(D) Steering
Answer: - Pitching
A yaw motion is a side-to side movement of the bow and stern of the ship. The transverse/Y axis, lateral axis, or pitch axis is an imaginary line running horizontally across the ship and through the centre of gravity. A pitch motion is an up-or-down movement of the bow and stern of the ship.
(Text & photo credit: - Wikipedia)
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