Computer Based Test Quiz Chemical Engineering - Set 12 Chemical Engg. Quiz Quiz Questions - Set 12 01. Ceramic tips for the cutting tool are prepared from __________ powder. (A) Carbon (B) Silicon carbide (C) Aluminium oxide (D) Tungsten 02. Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with (A) Vanadium & chromium (B) Silicon (C) Tungsten (D) Manganese 03. Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure. (A) 18 (B) 16 (C) 14 (D) 12 04. Paint spray gun works on the principle of (A) Bernoulli's theorem (B) Boyle's law (C) Newton's law of viscosity (D) None of these 05. What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply? (A) It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water (B) Economiser tube life increases due to handling of low temperature water (C) Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases (D) Scale formation rate on economiser tubes increases 06. A floating body oscillates about its __________ when it is displaced slightly. (A) Centre of gravity (B) Metacentre (C) Centre of buoyancy (D) Centre of pressure 07. Springs are not made of (A) Phosphor bronze (B) Nickel steel (C) Monel (D) Carbon steel (c ≤ 0.5%) 08. Freezing of 35% oleum during its shipment in winter is avoided by the addition of small amount of (A) Hydrochloric acid (B) Methyl alcohol (C) Formic acid (D) Nitric acid 09. A __________ type pressure sensing element is commonly used in aneroid barometer. (A) Capsule (B) Bellow (C) Spiral tube (D) Flat diaphragm 10. The factor of safety for brittle materials (having elongation less than 5%) is based on the __________ stress. (A) Yield (B) Proof (C) Ultimate (D) None of these 11. Materials used for making permanent magnets containing iron and nickel are made by __________ technique. (A) Powder metallurgy (B) Casting (C) Forging (D) None of these 12. 'Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction. (A) 0.5 (B) 5 (C) 25 (D) 50 13. The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is (A) Conduction (B) Convection (C) Both 'a' & 'b' (D) Radiation 14. Grain hardness is measured by the __________ hardness testing method. (A) Knoop (B) Rockwell F (C) Shore scleroscope (D) Vickers 15. Castability of aluminium is increased by the addition of __________ in it. (A) Silicon (B) Manganese (C) Bismuth (D) Lead Submit Test Next Quiz Tests: Set 01 Set 02 Set 03 Set 04 Set 05 Set 06 Set 07 Set 08 Set 09 Set 10 Set 11 Set 12 Set 13