MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1101. |
Ball mills and tube mills with flint or porcelain balls are used for size reduction of |
| A. | asbestos |
| B. | rubber |
| C. | non-metallic ores |
| D. | limestone |
| Answer» D. limestone | |
| 1102. |
Two particles are called to be equal settling, if they are having the same. |
| A. | size. |
| B. | specific gravity. |
| C. | terminal velocities in the same fluid & in the same field of force. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1103. |
__________ centrifuge is normally used in sugar mills. |
| A. | Tubular bowl |
| B. | Disc-bowl |
| C. | Suspended batch basket |
| D. | Perforated horizontal basket continuous |
| Answer» D. Perforated horizontal basket continuous | |
| 1104. |
Solid particles separation based on the difference in their flow velocities through fluids is termed as the |
| A. | clarification |
| B. | classification |
| C. | elutriation |
| D. | sedimentation |
| Answer» C. elutriation | |
| 1105. |
Diatomaceous earth is a/an |
| A. | explosive |
| B. | filter aid |
| C. | filter medium |
| D. | catalyst |
| Answer» C. filter medium | |
| 1106. |
The steam ejector is used to |
| A. | remove condensate from the steam pipelines. |
| B. | create vacuum. |
| C. | superheat the steam. |
| D. | none of these. |
| Answer» C. superheat the steam. | |
| 1107. |
When vaporisation takes place directly at the heating surface, it is called |
| A. | film boiling |
| B. | nucleate boiling |
| C. | vapour binding |
| D. | none of these |
| Answer» C. vapour binding | |
| 1108. |
With increase in temperature, the thermal conductivity of non-metallic amorphous solids |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | first decreases upto certain temperature and then increases |
| Answer» C. remains constant | |
| 1109. |
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | passes through a maxima |
| Answer» E. | |
| 1110. |
Fourier's law applies to the heat transfer by |
| A. | convection |
| B. | radiation |
| C. | conduction |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 1111. |
Low grade coal is __________ to produce ammonia synthesis gas. |
| A. | hydrogenated |
| B. | liquefied |
| C. | gasified |
| D. | dehydrogenated |
| Answer» D. dehydrogenated | |
| 1112. |
Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth ? |
| A. | Nitrogeneous fertiliser |
| B. | Potassic fertiliser |
| C. | Phosphatic fertiliser |
| D. | None of these |
| Answer» B. Potassic fertiliser | |
| 1113. |
Which nutrient in fertiliser makes the plant stems stronger and increases branching ? |
| A. | Nitrogen |
| B. | Phosphorous |
| C. | Potassium |
| D. | Calcium |
| Answer» C. Potassium | |
| 1114. |
Which of the following is not a product of tar distillation ? |
| A. | Phenol & naphthalene |
| B. | Benzol & pitch |
| C. | Anthracene & creosote |
| D. | None of these |
| Answer» E. | |
| 1115. |
Presence of force moisture in coal is most disadvantageous during its |
| A. | transportation and handling |
| B. | washing |
| C. | pulverisation |
| D. | storage |
| Answer» D. storage | |
| 1116. |
Tar is a better fuel than furnace oil, because of its |
| A. | higher calorific value. |
| B. | lower sulphur content. |
| C. | higher emissivity (0.8 - 0.9) resulting in higher radiation heat transfer rate. |
| D. | both (a) and (b). |
| Answer» E. | |
| 1117. |
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor. |
| A. | flight |
| B. | slat or drag |
| C. | ribbon |
| D. | screw |
| Answer» E. | |
| 1118. |
Equivalent diameter of a particle is the diameter of the sphere having the same |
| A. | ratio of surface to volume as the actual volume. |
| B. | ratio of volume to surface as the particle. |
| C. | volume as the particle. |
| D. | none of these. |
| Answer» B. ratio of volume to surface as the particle. | |
| 1119. |
Crystal size in a continuous crystalliser depends upon the |
| A. | rate of heat transfer. |
| B. | degree of turbulence. |
| C. | degree of supersaturation. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1120. |
Heat waves |
| A. | can not pass through vacuum. |
| B. | travel in straight line. |
| C. | can be reflected by a mirror. |
| D. | both (b) and (c). |
| Answer» E. | |
| 1121. |
Air is best heated with steam in a heat exchanger of |
| A. | plate type. |
| B. | double pipe type with fin on steam side. |
| C. | double pipe type with fin on air side. |
| D. | shell and tube type. |
| Answer» D. shell and tube type. | |
| 1122. |
Which of the following is generally considered as opaque surface towards radiations? |
| A. | Gases |
| B. | Solids |
| C. | Liquids |
| D. | Both (b) and (c) |
| Answer» E. | |
| 1123. |
Black liquor generated during paper manufacture is concentrated in a |
| A. | single effect evaporator. |
| B. | single effect evaporator followed by a crystalliser. |
| C. | multiple effect evaporator. |
| D. | multiple effect evaporators followed by a crystalliser. |
| Answer» D. multiple effect evaporators followed by a crystalliser. | |
| 1124. |
Which of the following tests is not done for transformer oil ? |
| A. | Flash point and acid value. |
| B. | Aniline point. |
| C. | Dielectric strength. |
| D. | Copper strip corrosion test. |
| Answer» C. Dielectric strength. | |
| 1125. |
Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene. |
| A. | Smoking tendency of hydrocarbons increases in the order : paraffins isoparaffins naphthenes aromatics. |
| B. | Smoking tendency of paraffins increases with decrease in its molecular weight. |
| C. | Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond. |
| D. | Smoking tendency of aromatics decreases with increase in its molecular weight. |
| Answer» C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond. | |
| 1126. |
Jigging is a technique by which different particles can be |
| A. | separated by particle size. |
| B. | separated by particle density. |
| C. | separated by particle shape. |
| D. | mixed. |
| Answer» B. separated by particle density. | |
| 1127. |
Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill. |
| A. | impact |
| B. | roll |
| C. | vibratory |
| D. | none of these |
| Answer» B. roll | |
| 1128. |
Balls for ball mills are never made of |
| A. | forged/cast steel |
| B. | lead |
| C. | cast iron |
| D. | alloy steel |
| Answer» C. cast iron | |
| 1129. |
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is |
| A. | in the central core of the fluid. |
| B. | uniformly distributed throughout the fluid. |
| C. | mainly confined to a thin film of fluid near the surface. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1130. |
Which of the following is concerned with both heat and mass transfer ? |
| A. | Lewis relationship |
| B. | Nusselt number |
| C. | Kutateladze number |
| D. | Froude number |
| Answer» B. Nusselt number | |
| 1131. |
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides |
| A. | higher economy |
| B. | lower capacity |
| C. | both (a) & (b) |
| D. | lower economy |
| Answer» B. lower capacity | |
| 1132. |
A 10 cm dia steam pipe, carrying steam at 180 C, is covered with an insulation (conductivity = 0.6 W/m. C). It losses heat to the surroundings at 30 C. Assume a heat transfer co-efficient of 0.8 W/m2. C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be |
| A. | greater than that for uninsulated steam pipe. |
| B. | less than that of the uninsulated steam pipe. |
| C. | equal to that of the uninsulated steam pipe. |
| D. | less than the steam pipe with 5 cms insulation. |
| Answer» C. equal to that of the uninsulated steam pipe. | |
| 1133. |
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer. |
| A. | no |
| B. | the least |
| C. | the largest |
| D. | lower |
| Answer» D. lower | |
| 1134. |
The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K= 0.04 W/m. K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is - 5 C. The outside wall temperature is |
| A. | 25 C |
| B. | 30 C |
| C. | 35 C |
| D. | 40 C |
| Answer» D. 40 C | |
| 1135. |
Thermal conductivity of a conducting solid material depends upon its |
| A. | temperature |
| B. | porosity |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1136. |
Economy of a multiple effect evaporator is not influenced much by the |
| A. | boiling point elevations |
| B. | temperature of the feed |
| C. | rate of heat transfer |
| D. | ratio of the weight of the thin liquor to thick liquor |
| Answer» B. temperature of the feed | |
| 1137. |
Increasing the liquor level in the evaporator results in the |
| A. | decreased capacity. |
| B. | increase in liquor film co-efficient. |
| C. | decreased effect of hydrostatic head. |
| D. | increased true temperature drop. |
| Answer» B. increase in liquor film co-efficient. | |
| 1138. |
Kirchoff s law applies to __________ radiation. |
| A. | total |
| B. | monochromatic |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1139. |
With the increase of temperature, the Col-burn jH factor |
| A. | increases. |
| B. | decreases. |
| C. | remains unchanged. |
| D. | may increase or decrease ; depending on temperature. |
| Answer» B. decreases. | |
| 1140. |
The number of kg vaporised per kg of steam fed to the evaporator is defined as |
| A. | capacity |
| B. | rate of evaporation |
| C. | economy |
| D. | rate of vaporisation |
| Answer» D. rate of vaporisation | |
| 1141. |
In case of evaporators, liquid entrainment results primarily due to |
| A. | high vacuum in the evaporator. |
| B. | high evaporation rate. |
| C. | foaming of the solution. |
| D. | high heat transfer rate. |
| Answer» D. high heat transfer rate. | |
| 1142. |
Baffles in the shell side of a shell and tube heat exchanger |
| A. | increase the cross-section of the shell side liquid. |
| B. | force the liquid to flow parallel to the bank. |
| C. | increase the shell side heat transfer co-efficient. |
| D. | decrease the shell side heat transfer co-efficient. |
| Answer» D. decrease the shell side heat transfer co-efficient. | |
| 1143. |
Presence of a non-condensing gas in a condensing vapour |
| A. | increases the rate of condensation. |
| B. | decreases thermal resistance. |
| C. | is desirable to increase the film co-efficient. |
| D. | none of these. |
| Answer» E. | |
| 1144. |
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is |
| A. | finned tube heat exchanger with air inside and steam outside. |
| B. | finned tube heat exchanger with air outside and steam inside. |
| C. | shell and tube heat exchanger with air inside tubes and steam on shell side. |
| D. | shell and tube heat exchanger with air on shell side and steam inside tubes. |
| Answer» C. shell and tube heat exchanger with air inside tubes and steam on shell side. | |
| 1145. |
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone. |
| A. | laminar |
| B. | transition |
| C. | both 'a' & 'b' |
| D. | highly turbulent |
| Answer» E. | |
| 1146. |
The actual temperature drop across the heating surface in an evaporator depends on the |
| A. | feed. |
| B. | depth of liquid over heating surface. |
| C. | pressure difference between steam chest and vapour space. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1147. |
Ionisation potential employed in the industrial electrostatic precipitator is of the order of |
| A. | 30 to 70 kV DC |
| B. | 30 to 70 kV AC |
| C. | 230 V AC |
| D. | 230 V DC |
| Answer» B. 30 to 70 kV AC | |
| 1148. |
Which of the following is the most detrimental for water used in high pressure boiler ? |
| A. | Silica |
| B. | Turbidity |
| C. | Phenol |
| D. | Dissolved oxygen |
| Answer» B. Turbidity | |
| 1149. |
Smoke is produced due to |
| A. | insufficient supply of combustion air and insufficient time for combustion. |
| B. | poor quality of fuel and improper mixing of fuel & combustion air. |
| C. | poor design & overloading of furnace. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1150. |
Illuminating characteristics of kerosene is expressed by its |
| A. | smoke point |
| B. | aniline point |
| C. | luminosity number |
| D. | aromatic content |
| Answer» D. aromatic content | |