- (A) Speed of the fan
- (B) Damper
- (C) Variation in the pitch of fan blades
- (D) All
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- (A) Regenerator
- (B) Metallic recuperator
- (C) Ceramic recuperator
- (D) None of these
- (A) Arc
- (B) Resistance
- (C) Low frequency induction
- (D) High frequency induction
- (A) 5
- (B) 20
- (C) 50
- (D) 80
- (A) 2000
- (B) 3000
- (C) 4500
- (D) 6000
- (A) Same
- (B) Less
- (C) More
- (D) Either more or less; depends on the flue gas density
- (A) Waste heat recovery from flue gas
- (B) Minimising heat losses from furnace walls
- (C) Maintaining proper draught
- (D) All
- (A) Stainless steel is nothing but chromium coated steel
- (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal
- (C) Plastic deformation of a material is its temporary distortion under the action of applied stress
- (D) Rusting of iron is not electrochemical in nature
- (A) Hardening makes the steel more brittle
- (B) High alloy steels contain more than 50% alloying element
- (C) 18/8 stainless steel is a magnetic steel
- (D) Both
- (A) Alloys are harder than their component elements
- (B) Presence of silicon in steel decreases its electrical resistance
- (C) Karbate is an acid resistant material of construction
- (D) Nichrome, a steel alloyed with 10% Ni and 20% Cr can be used upto a temperature of 1100°C
