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You Are On Multi Choice Question Bank SET 722
36101. __________ steel is widely used for the manufacture of motor car crankshafts.
(A): Silicon (B): Nickel (C): Chrome (D): High speed
36102. Galvanising (i.e., zinc coating) of steel sheets is done to
(A): prevent its rusting by contact with corrosive atmosphere. (B): protect the base metal by cathodic protection. (C): both & . (D): neither nor .
36103. Which of the following is not a nickel based alloy ?
(A): Inconel (B): Hastelloys (C): Nimonics (D): Babbit metal
36104. Coke oven walls are lined with __________ bricks.
(A): silica (B): tar-dolomite (C): low thermal conductivity (D): fire clay
36105. Iron rust is
(A): ferrous oxide. (B): hydrated ferric oxide. (C): powdered iron. (D): ferric sulphide.
36106. Urea autoclave is made of
(A): cast iron (B): refractory blocks (C): stainless steel (D): lead lined steel
36107. Mild steel is
(A): a low carbon steel (0.05 to 0.3% carbon). (B): highly resistant to corrosion (as much as stainless steel). (C): a high carbon steel (0.5 to 1.5% carbon). (D): very poor in strength & ductility.
36108. Dilute sulphuric acid is transported in __________ pipes.
(A): mild steel (B): lead (C): copper (D): special alloys
36109. __________ alloys have the highest specific strength of all the structural materials out of the following.
(A): Magnetic steel (B): Titanium (C): Chromium (D): Magnesium
36110. 100% H2SO4 at 30°C can't be stored in a vessel made/lined with
(A): cast iron and high silicon iron. (B): mild steel and stainless steel. (C): aluminium, tin and rubber. (D): teflon, glass and porcelain.
36111. Carbon content in plain carbon steel is __________ percent.
(A): 0.1 to 0.15 (B): 0.35 to 0.45 (C): 0.65 to 0.80 (D): 0.85 to 1.2
36112. Duralumin is an alloy of
(A): aluminium, copper and manganese. (B): aluminium, nickel and silicon. (C): aluminium and nickel. (D): none of these.
36113. Advantages of helical gear rather than spur gear in transmission is
(A): Low cost (B): Less and thrust (C): Economy (D): Low noise
36114. Concentrated HCl at 30°C can be stored in a vessel made of
(A): PTFE and porcelain. (B): cast iron and aluminium. (C): stainless steel and high silicon cast iron. (D): none of these.
36115. In carburetor the transfer port comes into operation
(A): At maximum engine speed (B): During slow speed operation (C): When engine is idling (D): After engine is turned off
36116. A magnetic material becomes __________ above the Curie temperature.
(A): ferromagnetic (B): diamagnetic (C): paramagnetic (D): none of these
36117. Which of the following is not a non-ferrous alloy ?
(A): Meehanite (B): Magnalium (C): Gun metal (D): Muntz metal
36118. The bearing clearance is never measured with
(A): Vernier caliper (B): Feeler gauge (C): Plastic gauge (D): Micrometer
36119. Water gas generator is made of
(A): carbon steel-brick lined (B): stainless steel-lead lined (C): cast iron (D): high carbon steel-procelain lined
36120. The digester of a Gobar gas plant is a
(A): mild steel drum (B): stainless steel vessel (C): masonry well (D): cast iron vessel
36121. The ability of a material to offer resistance to scratching or indentation is a measure of its
(A): brittleness (B): toughness (C): hardness (D): resilience
36122. Brine (15% concentration) can be stored in a vessel made of
(A): monel (B): karbate (C): cast iron (D): none of these
36123. Generally __________ are subjected to galvanising (i.e., zinc coating).
(A): non-ferrous metals (B): non-metals (C): low carbon steels (D): stainless steel
36124. A material no longer behaves elastically beyond
(A): plastic limit (B): limiting load (C): elastic limit (D): breaking load
36125. When the steel is subjected to normalising, its __________ decreases.
(A): yield point (B): ductility (C): ultimate tensile strength (UTS) (D): none of these
36126. The most commonly used resin for making reinforced plastic is
(A): unsaturated polyester (B): polypropylene (C): polyurathane (D): nylon-6
36127. Most suitable material for high pressure vessel operating at 500 atm. and 500° C is
(A): molybdenum stainless steel. (B): 18/8 stainless steel. (C): mild steel. (D): high silicon iron (14% Si).
36128. The car air conditioning system the three major enemies are
(A): Gasoline,oil and electricity (B): Moisture,dirt and air (C): Cold weather,high altitude and humidity (D): Hot weather,low altitude and humidity
36129. The function of over drive is
(A): To step up gear ratio (B): To step down gear ratio (C): To increase torque (D): To reduce speed
36130. Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of
(A): brass (B): copper (C): high carbon steel (D): aluminium
36131. Which of the following contains maximum percentage of carbon ?
(A): Boiler plate steel (B): Rail steel (C): Saws for cutting steel (D): Railway spring steel
36132. The ratio of height and width of the tire is known as
(A): Aspect ratio (B): Tire type (C): Rim diameter (D): All of the above
36133. Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
(A): high strength to weight ratio. (B): low temperature strength properties. (C): its ability to be cast, rolled, forged & stamped. (D): high strength and corrosion & oxidation-resistance at elevated temperature.
36134. Babbit metal used for making bearings should have
(A): high-co-efficient of friction between journal and bearing. (B): ability to retain lubricant on its surface. (C): low co-efficient of friction between journal and bearing. (D): both & .
36135. Vessels made of __________ can be used to store dry chlorine.
(A): thermoplastic materials (B): nickel (C): steel or iron (D): none of these
36136. For spinning viscose rayon, the extrusion spinnerettes are made of
(A): platinum or gold alloys (B): high carbon steel (C): aluminium (D): nickel
36137. Alpha iron is stable __________ °C.
(A): above 1403 (B): upto 910 (C): above 1800 (D): between 910 & 1403
36138. Babbit metal (used for making bearings) comprises of
(A): mainly tin (85%) and lead. (B): saw dust and iron dust mixture. (C): zinc and aluminium. (D): copper and aluminium.
36139. Hydrochloric acid is stored in a __________ steel vessel.
(A): lead lined (B): rubber lined (C): glass lined (D): stainless
36140. Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is
(A): used for making axle & shafts of aeroplanes, automobiles and locomotives. (B): having poor fatigue resistance. (C): having poor toughness. (D): not helpful in producing cleaner steel due to oxidising action of vanadium.
36141. The parking brake are generally operated by
(A): Electrically (B): Mechanically (C): Hydraulically (D): Air pressure
36142. Electronic structure of a material is generally studied by
(A): metallurgical microscope (B): electron diffraction (C): spectroscopic techniques (D): X-ray
36143. Which of the following has the poorest wel-dability ?
(A): Low carbon steel (B): Mild steel (C): Wrought iron (D): High-carbon steel
36144. Creep is not exhibited at low temperature by
(A): rubber (B): acrylics (C): lead (D): plastics
36145. Nickel and molybdenum are the basic constituents of
(A): hastealloy (B): German silver (C): inconel (D): solder
36146. Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
(A): beryllium (B): manganese (C): copper (D): iron
36147. A steel alloy containing 36% nickel is called __________ , which has a zero co-efficient of expansion.
(A): austenitic stainless steel (B): heat resisting steel (C): invar (D): high speed steel
36148. Which of the following is not used as the ceramic material in 'cermets' ?
(A): Silicides (B): Oxides (C): Carbides (D): Nitrides
36149. Glass lined vessels are not used for handling/storing
(A): dilute H2SO4 (B): dilute HNO3 (C): dilute HCl (D): hydroflouric acid
36150. For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
(A): stainless steel (B): cast iron (C): aluminium (D): nickel
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