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You Are On Multi Choice Question Bank SET 582
29101. __________ is not a heat treatment process.
(A): Cyaniding (B): Pakerising (C): Austempering (D): Martempering
29102. An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
(A): 0 (B): 60 (C): 30 (D): 20
29103. Volute casing of a centrifugal pump does not facilitate
(A): uniform flow of fluid coming out of the impeller. (B): increase in the pump efficiency. (C): conversion of the part of the velocity head to the pressure head. (D): conversion of the part of the pressure head to velocity head.
29104. Desert air coolers being rendered ineffective in rainy season is due to
(A): low humidity (B): low temperature (C): high humidity (D): sunny weather
29105. The hydraulic radius of a circular pipe of diameter 'd' flowing full is
(A): d/4 (B): d/2 (C): 2d/3 (D): d/3
29106. Stainless steel is welded with difficulty because of
(A): its high melting temperature. (B): chances of cracking. (C): oxide film formation. (D): chromium carbide formation.
29107. For preparation of porous bearings by powder metallurgy, preferred particle shape is
(A): spherical (B): nodular (C): irregular (D): no preferred shape
29108. The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
(A): 0.5 (B): 3 (C): 10 (D): 25
29109. High speed steel tools retain their hardness upto a temperature of __________ °C.
(A): 500 (B): 750 (C): 900 (D): 1100
29110. Wrought iron does not have
(A): uniform strength in all directions. (B): ability to hold protective coating. (C): high ductility & corrosion resistance. (D): easily weldable characteristics.
29111. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
(A): strain rate is increased. (B): grain size is increased. (C): prior cold deformation is increased. (D): not affected by any of the above parameters.
29112. __________ are normally subjected to sub-zero treatment.
(A): Highly stressed parts (B): Gauges or precision parts (C): Cold rolled sheets (D): Non machinable materials
29113. Induced draft fans provided in large thermal power plant boilers have __________ blades.
(A): forward curved (B): backward curved (C): double curved (D): radial or straight
29114. Which of the following has the highest value of refractive index ?
(A): Brine (sea water) (B): Diamond (C): Distilled water (D): Glass
29115. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
(A): 1 (B): 10 (C): 30 (D): 45
29116. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 .
(A): 0.5 (B): 1 (C): 2 (D): 2.5
29117. Out of the following, the joint produced by __________ has the lowest strength.
(A): soldering (B): welding (C): brazing (D): rivetting
29118. Dies for wire drawing are generally made of
(A): mild steel (B): stainless steel (C): carbides (D): high carbon steel
29119. The starting of a car takes time in winter, because the
(A): octane number of fuel is decreased. (B): fuel supply for ignition is not sufficient. (C): vaporisation of the fuel is decreased. (D): pour point of fuel decreases.
29120. The elastic strain in copper is due to the
(A): motion of dislocations. (B): stretching of atomic bonds. (C): breakage of atomic bonds. (D): none of the above.
29121. Milk is fat dispersed in water. It is an example of
(A): suspension (B): emulsion (C): gel (D): solution
29122. __________ is the most suitable lubricant for drawing mild steel wires?
(A): Kerosene (B): Water (C): Sodium stearate (D): Lime water
29123. Reduction in the grain size reduces the __________ of the material.
(A): fatigue resistance (B): tensile strength (C): creep resistance (D): all , &
29124. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
(A): high vacuum (B): zero pressure (C): 0°K
29125. In case of simple harmonic motion, displacement is proportional to the
(A): velocity (B): acceleration (C): both & (D): neither nor
29126. In TIG welding, thoriated tungsten electrodes are used, because it
(A): has higher current carraying capacity. (B): has better electron emissivity. (C): is stronger than ordinary tungsten. (D): is easy to prepare.
29127. Vernier calipers can not be used to measure the
(A): I.D. & O.D. of the shaft. (B): thickness of parts. (C): depth of holes. (D): clearance between two mating surfaces.
29128. Which of the following is not the commercial name of polymethyl-methacrylate (PMMA) ?
(A): Styrofoam (B): Lucite (C): Perspex (D): Plexiglass
29129. On being hit with a hammer, __________ will readily fracture.
(A): brass (B): mild steel (C): cast iron (D): lead
29130. Which of the following does not discharge the dust collected as a dry solid ?
(A): Electrostatic precipitator (B): Wet scrubber (C): Bag filter (D): Gravity settling chamber
29131. Wood is a/an __________ material.
(A): amorphous (B): cellular (C): homogeneous (D): grannular
29132. The energy currency of a cell is
(A): AMP (B): Carbohydrate (C): NAD (D): ATP
29133. Use of flux during soldering is done to
(A): increase flidity of solder by lowering its melting temperature. (B): prevent oxide formation. (C): wash away surplus solder. (D): full up the joint gap.
29134. Heart is protected by a double walled membranous bag called
(A): Pericardium (B): Pleural membrane (C): Meninges (D): None of the above
29135. Resilience of a bolt can be increased by increasing its
(A): length (B): shank diameter (C): head diameter (D): none of these
29136. Ammonia leakage in the refrigeration system is detected by
(A): sulphur stick, which on detection gives white smoke. (B): using chemical reagents. (C): its smell. (D): soap solution.
29137. Fibre glass is a composite material of
(A): glass fibre in a polymer matrix. (B): glass fibre in a metallic matrix. (C): polymer fibre in a glassy matrix.
29138. According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is
(A): 180° (B): 212° (C): 32° (D): 273°
29139. Maximum consumption of limestone is in the __________ industry.
(A): iron and steel (B): cement (C): glass (D): fertiliser
29140. Austenite is not
(A): ductile (B): malleable (C): magnetic (D): soft
29141. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
(A): working (B): bearing (C): yield (D): none of these
29142. Out of the following, the __________ pipe has the least corrosion resistance.
(A): mild steel (B): copper (C): cast iron (D): wrought iron
29143. With increase in steam pressure, its specific volume decreases
(A): rapidly first and then slowly. (B): linearly. (C): slowly first and then rapidly. (D): exponentially.
29144. Which of the following rays has the least wavelength?
(A): Ultraviolet rays (B): Infrared rays (C): Cosmic rays (D): X-rays
29145. Hydrocyclone is a
(A): crusher (B): wet classifier (C): dry classifier (D): magnetic separator
29146. Device used as a standard for the calibration of pressure gauges is a
(A): bellow (B): diaphragm (C): dead weight pressure tester (D): mercury manometer
29147. X-rays are
(A): positively charged. (B): negatively charged. (C): neutral. (D): of higher wavelength than visible light.
29148. Diffusion co-efficient of a metal in a solid solution depends upon its
(A): composition (B): temperature (C): both & (D): neither nor
29149. Cast iron contains __________ percent carbon.
(A): 2.5 (B): 3.75 (C): 4.75 (D): 5.25
29150. Alloys having more than 80% copper are generally more
(A): abrasion resistant. (B): corrosion resistant. (C): prone to season cracking. (D): machinable.
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