51
The fermentor used for the production of ethyl alcohol from molasses is made of
A)
Wood
B)
Concrete
C)
Copper bearing steel
D)
Procelain
Answer & Solution
Answer: Option
C
52
The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
A)
Tempering
B)
Normalising
C)
Annealing
D)
None of these
Answer & Solution
Answer: Option
B
53
The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.
A)
Non-crystalline solid
B)
Crystalline
C)
Rubberry
D)
Non-crystalline organic polymeric
Answer & Solution
Answer: Option
D
54
Cast iron compared to steel is better in
A)
Ductility
B)
Fluidity & castability
C)
Strength
D)
Malleability
Answer & Solution
Answer: Option
B
55
H2 SO4 (< 50% concentration) is corrosive to
A)
Aluminium, mild steel, stainless steel, concrete & tin
B)
Copper, cast iron & high silicon iron (14% Si)
C)
Rubber (butyl and hard), silicone rubber & teflon
D)
Glass, graphite, porcelain & stoneware
Answer & Solution
Answer: Option
A
56
Constantan is an alloy of
A)
Cu (55%) & Sn (45%)
B)
Cu (55%) & Ni (45%)
C)
Pt (95%) & Rh (10%)
D)
Fe (80%) & Ni (20%)
Answer & Solution
Answer: Option
B
57
Constituents of stellite are
A)
Zinc, copper and nickel
B)
Cobalt, chromium and tungsten
C)
Zinc, aluminium and nickel
D)
Nickel, cobalt and vanadium
Answer & Solution
Answer: Option
B
58
Polythene (low or high density) containers are not corroded by
A)
Sulphuric acid (10%) at room temperature
B)
Nitric acid (95%) at room temperature
C)
Sulphur trioxide at 60°C
D)
Any of these
Answer & Solution
Answer: Option
A
59
An alloy of iron containing 4% carbon is called
A)
High carbon steel
B)
Wrought iron
C)
Mild steel
D)
None of these
Answer & Solution
Answer: Option
D
60
German silver used for decorative purposes contains maximum percentage of
A)
Silver
B)
Copper
C)
Zinc
D)
Nickel
Answer & Solution
Answer: Option
B
