chemical engineering chemical engineering basics Mcqs
101. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?
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A. Zero

B. Very high which prevents their ignition by compression

C. Very low which prevents their ignition by compression

D. None of these

102. _______________ has a negative co-efficient of linear expansion?
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A. Nickel

B. Rubber

C. Iron

D. Copper
103. Particle nature of cathode rays is proved due to the fact that they ________________?
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A. Produce fluorescence

B. Heat the exposed material

C. Travel in a straight line

D. Get deflected by magnetic electric field
104. Working of linear variable differential transducer (LVDT) is based on the principle of variable_____________________?
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A. Capacitance

B. Mutual inductance

C. Resistance

D. None of these

105. Minimum number of members required to form a Public Limited Joint Stock Com-pany is___________________?
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A. 12

B. 17

C. 7

D. 10

106. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is__________________?
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A. Much more

B. More

C. Less

D. Equal
107. A spring material should have low__________________?
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A. Deflection value

B. Elastic limit

C. Fatigue resistance

D. None of these
108. Cementite is in the lamellar form in the _____________________ phase of steel ?
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A. Martenistic

B. Bainitic

C. Ferritic

D. Pearlitic
109. Which of the following is not a dielectric material ?
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A. All refractory materials

B. Cotton, silk and paper

C. Asbestos, glass, porcelain and mica

D. Rubber and polymeric resins
110. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?
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A. 35

B. 10

C. 20

D. 5

111. Upto the critical radius of insulation, added insulation, will____________________?
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A. Decrease heat flux

B. Decrease heat loss and will have no effect beyond that

C. Increase the heat loss

D. Reduce convection heat loss compared to conduction heat less

112. Transformation range for ferrous material is the temperature interval during which ___________________ is formed during its heating?
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A. Austenite

B. Martensite

C. Pearlite

D. Cementite

113. Youngs modulus of a material is the measure of its ___________________?
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A. Creep resistance

B. Stiffness

C. Malleability

D. Tensile strength

114. The most suitable material of construction for a sewer to carry sewage under high pressure is________________________?
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A. Stoneware

B. Cement concrete

C. Asbestos cement

D. Steel
115. Which of the following is used to produce draught in the locomotive boilers ?
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A. Induced draught fan

B. Forced draught fan

C. Chimney

D. Steam jet arrangement
116. What is the value of entropy at 273K ?
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A. 0

B. 1

C. ?

D. None of these

117. In Newtons law of viscosity, which states that the shear stress is proportional to the _____________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ?
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A. V2

B. 1/Vg

C. 1/V2

D. Vg
118. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
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A. Temperature of hot pipe surface & that of air in the room

B. Diameter & length of the pipe

C. Emissivity of pipe surface

D. None of these
119. Angular displacement can be measured suitably by a______________________?
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A. Shaft encoder

B. Linear variable differential transducer (LVDT)

C. Stroboscope

D. Tachometer

120. Plastics as a material of construction suffer from the drawback of low_________________?
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A. Plastic deformation

B. Density

C. Machinability

D. Strength
121. Addition of _____________________ to steel does not impart hardness?
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A. Nickel

B. Silicon

C. Chromium

D. Copper
122. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron ?
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A. 2537

B. 1837

C. 159

D. 10000

123. Which of the following is an acidic constituent of B.F. slag ?
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A. CaO

B. SiO2

C. FeO

D. MgO

124. ________________ property of steel increases by addition of large amount of silicon in it?
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A. Machining

B. Mechanical

C. Magnetic

D. Refractory

125. Dislocations are _______________ defects?
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A. None of these

B. Volume

C. Line

D. Point

126. A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?
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A. Vapor pressure

B. Saturated humidity

C. Absolute humidity

D. Aqueous tension
127. Larger length & diameter water pipes are made by____________________?
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A. Continuous casting

B. Die casting

C. Semi-centrifugal casting

D. Electrical resistance welding

128. Which of the following is not used as a bearing material ?
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A. Cermets

B. Copper-lead alloys

C. Babbitts

D. Bronzes

129. Spherical shape of mercury droplets is due to its____________________?
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A. High density

B. High viscosity

C. High surface tension

D. Low surface tension

130. Wavelength of radiation emitted by a body depends on the ________________ of its surface?
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A. Nature

B. Area

C. Temperature

D. All A, B & C

131. Which of the following is an unconventional source of energy ?
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A. Nuclear-fusion power

B. Hydroelectric power

C. Thermal power

D. Solar power
132. In TIG welding, thoriated tungsten electrodes are used, because it ____________________?
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A. Is stronger than ordinary tungsten

B. Has better electron emissivity

C. Has higher current carrying capacity

D. Is easy to prepare

133. Powder metallurgy process does not make metal powder by_________________________?
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A. Hammering

B. Electrolytic deposition

C. Atomisation

D. Grinding/milling

134. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is_____________________?
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A. 3CaO. Al2O3

B. 5CaO. 3 Al2O3

C. 2CaO. SiO2

D. 3CaO. SiO2

135. Carbon is present in the form of _______________________ in grey cast iron ?
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A. Flakes

B. Cementite

C. Nodular aggregates of graphite

D. Spheroids

136. Carnot cycle is also termed as the constant _________________ cycle in thermodynamics?
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A. Heat

B. Volume

C. Entropy

D. Pressure

137. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of__________________?
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A. 1:04

B. 2:01

C. 1 : 1

D. 1:02

138. Boiling point of water gets lowered at high altitudes (e.g., hills), because ___________________?
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A. Atmospheric pressure is low

B. None of these

C. Atmospheric pressure is high

D. Temperature is low

139. Which one of the following is incombustible ?
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A. S

B. C2H2

C. H2

D. CCl4
140. Basic open hearth furnace (BOF) is not used for producing ______________ steel?
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A. None of these

B. Killed

C. Rimming

D. High alloy
141. For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ?
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A. Evaporation

B. Fractional distillation

C. Chromatography

D. Filtration
142. The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively __________________?
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A. 10 and 50

B. 7 and 30

C. 13 and 55

D. 2 and 50
143. Which of the following equipments is used for liquid dispersion ?
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A. Bubble cap plate column

B. Wetted wall column

C. Venturi scrubber

D. Packed column

144. Colour comparator is used to measure the___________________?
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A. Colour intensity

B. None of these

C. pH value

D. Electrode potential

145. Ammonia leakage in the refrigeration system is detected by_________________?
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A. Soap solution

B. Using chemical reagents

C. Its smell

D. Sulphur stick, which on detection gives white smoke
146. Tumbling is the process of improving the ________________ of the materials/parts ?
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A. Surface finish

B. Fatigue limit

C. Surface cleanliness

D. Creep limit

147. __________________ of air does not increase with increase in temperature?
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A. Thermal diffusivity

B. Viscosity

C. Thermal conductivity

D. Density
148. Silicon in steel__________________?
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A. All A, B & C

B. Makes it usable in almost all magnetic circuits where alternating current is used

C. Is present upto 5% & 4% respectively when used in transformers & motor armatures

D. Increases its electrical resistivity and decreases the hysteresis loss

149. The highest stress that a material can withstand for a specified length of time without excessive deformation is called the ____________ strength ?
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A. Endurance

B. Fatigue

C. None of these

D. Creep
150. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?
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A. 0.001

B. 0.02

C. 0.01

D. 0.002