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.
| 5051. |
What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ? |
| A. | 6.5 cms |
| B. | 6.5 mm |
| C. | Equal to tube I.D |
| D. | Equal to tube O.D |
| Answer» C. Equal to tube I.D | |
| 5052. |
Pick out the correct statement |
| A. | Centre to centre distance between two consecutives rivets in a row is called the pitch. |
| B. | A rivetted joint made in overlapping plates is called butt joint. |
| C. | Hole size drilled in rivetted plates is less than the actual size of the rivet. |
| D. | none of these. |
| Answer» B. A rivetted joint made in overlapping plates is called butt joint. | |
| 5053. |
Safety valves are provided in chemical equipments to guard against excessive |
| A. | temperature |
| B. | pressure/pressure fluctuation |
| C. | turbulence |
| D. | noise |
| Answer» C. turbulence | |
| 5054. |
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for |
| A. | reducing scale deposition. |
| B. | increasing pressure drop. |
| C. | fixing the tubes. |
| D. | creating turbulence. |
| Answer» E. | |
| 5055. |
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by |
| A. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/570-146-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/570-146-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/570-146-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/570-146-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/570-146-2.png"> | |
| 5056. |
For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser. |
| A. | half |
| B. | twice |
| C. | thrice |
| D. | five times |
| Answer» D. five times | |
| 5057. |
A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult's Law. |
| A. | positive |
| B. | negative |
| C. | no |
| D. | none of these |
| Answer» B. negative | |
| 5058. |
In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ? |
| A. | Long tube vertical evaporator |
| B. | Short tube vertical evaporator |
| C. | Horizontal tube evaporator |
| D. | None of these |
| Answer» D. None of these | |
| 5059. |
The concentration of A in a first order reaction, A B, decreases |
| A. | linearly with time. |
| B. | exponentially with time. |
| C. | very abruptly towards the end of the reaction. |
| D. | logarithmically with time. |
| Answer» C. very abruptly towards the end of the reaction. | |
| 5060. |
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of |
| A. | ideal plug flow |
| B. | bypass |
| C. | dead zone |
| D. | chanelling |
| Answer» D. chanelling | |
| 5061. |
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. |
| A. | 90 |
| B. | 120 |
| C. | 150 |
| D. | 180 |
| Answer» C. 150 | |
| 5062. |
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by |
| A. | biological oxidation. |
| B. | skimming off. |
| C. | settling out using chemical reagents. |
| D. | chlorination. |
| Answer» D. chlorination. | |
| 5063. |
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called |
| A. | thermosphere |
| B. | stratosphere |
| C. | troposphere |
| D. | mesosphere |
| Answer» C. troposphere | |
| 5064. |
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10 C, doubles the toxic effects of __________ present in it. |
| A. | coal ash |
| B. | potassium cyanide |
| C. | ortho-xylene |
| D. | none of these |
| Answer» C. ortho-xylene | |
| 5065. |
Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas. |
| A. | moderately |
| B. | highly |
| C. | extremely |
| D. | very extremely |
| Answer» E. | |
| 5066. |
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks. |
| A. | 1 to 2 |
| B. | 4 to 5 |
| C. | 9 to 10 |
| D. | 15 to 20 |
| Answer» C. 9 to 10 | |
| 5067. |
The lowest layer of atmosphere is known as the |
| A. | stratosphere |
| B. | troposphere |
| C. | ionosphere |
| D. | none of these |
| Answer» C. ionosphere | |
| 5068. |
Arsenic pollutant is not generated in____industries. |
| A. | tanneries |
| B. | glass & ceramic |
| C. | beverages |
| D. | any of these. |
| Answer» D. any of these. | |
| 5069. |
Algae growth in water is controlled by |
| A. | deoxidation |
| B. | chlorination |
| C. | bleaching |
| D. | aeration |
| Answer» C. bleaching | |
| 5070. |
The term Biological Oxygen Demand (BOD) is used in relation to |
| A. | potable water |
| B. | cooling water |
| C. | distilled water |
| D. | industrial effluents |
| Answer» E. | |
| 5071. |
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water. |
| A. | mercury |
| B. | lead |
| C. | fluoride |
| D. | arsenic |
| Answer» D. arsenic | |
| 5072. |
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the |
| A. | ionosphere |
| B. | troposphere |
| C. | stratosphere |
| D. | none of these |
| Answer» C. stratosphere | |
| 5073. |
Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about __________ kms. |
| A. | 0.1 to 0.5 |
| B. | 1.5 to 4.5 |
| C. | 7.5 to 12.5 |
| D. | 15-20 |
| Answer» C. 7.5 to 12.5 | |
| 5074. |
Deoiling is the process of removal of oil from wax. It is done by the __________ process. |
| A. | solvent extraction |
| B. | sweating |
| C. | resettling |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 5075. |
Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs. |
| A. | conical |
| B. | flat |
| C. | floating |
| D. | fixed |
| Answer» D. fixed | |
| 5076. |
Larger depth of liquid on the trays of a distillation column |
| A. | leads to high tray efficiency. |
| B. | results in higher pressure drop per tray. |
| C. | both (a) & (b). |
| D. | neither (a) or (b). |
| Answer» D. neither (a) or (b). | |
| 5077. |
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds. |
| A. | 2.5 |
| B. | 5 |
| C. | 12.5 |
| D. | 17.5 |
| Answer» C. 12.5 | |
| 5078. |
A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is |
| A. | bending |
| B. | deformation |
| C. | shear |
| D. | elongation |
| Answer» B. deformation | |
| 5079. |
Scale up problem in design based on the similarity concept takes into account __________ similarity. |
| A. | geometrical |
| B. | kinematic |
| C. | dynamic |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 5080. |
__________ closure is the weakest enclosure for cylindrical vessels. |
| A. | Hemispherical |
| B. | Torispherical |
| C. | Conical or flat plate |
| D. | Elliptical |
| Answer» D. Elliptical | |
| 5081. |
Which of the following efficiencies can be greater than 100% ? |
| A. | Overall plate efficiency. |
| B. | Murphree plate efficiency. |
| C. | Point efficiency. |
| D. | None of these. |
| Answer» C. Point efficiency. | |
| 5082. |
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation |
| A. | increases capacity. |
| B. | increases economy. |
| C. | does not affect the capacity. |
| D. | both 'b' & 'c'. |
| Answer» E. | |
| 5083. |
for a Tee (used as elbow, entering run) would be around |
| A. | 5 |
| B. | 60 |
| C. | 200 |
| D. | 350 |
| Answer» C. 200 | |
| 5084. |
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always |
| A. | less than arithmetic mean value. |
| B. | more than arithmetic mean value. |
| C. | more than geometric mean value. |
| D. | both(b) & (c). |
| Answer» B. more than arithmetic mean value. | |
| 5085. |
Pick out the wrong statement pertaining to shell and tube heat exchanger. |
| A. | Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle. |
| B. | Baffles are supported independently of the tubes by tie rods and positioned by spacers. |
| C. | Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter. |
| D. | Bracket supports are used for horizontal shell, while saddle support is used for vertical shell. |
| Answer» E. | |
| 5086. |
Wind load consideration in the design of a support can be neglected, when the vessel is |
| A. | tall (say 30 metres), but is full of liquid. |
| B. | tall but empty. |
| C. | short (< 2 m) and housed indoor. |
| D. | none of these. |
| Answer» D. none of these. | |
| 5087. |
Souders Brown equation given by, , is used for the calculation of the __________ in a continuous distillation column. |
| A. | diameter of the bubble cap column |
| B. | diameter of the seive plate column |
| C. | tray pressure drop |
| D. | residence time in the downcomer for the disengagement of entrained vapour |
| Answer» B. diameter of the seive plate column | |
| 5088. |
The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always |
| A. | 1 |
| B. | < 1 |
| C. | >1 |
| D. | equal to the order of reaction |
| Answer» D. equal to the order of reaction | |
| 5089. |
Cylinderical shell thickness of rotary drier is generally __________ mm. |
| A. | 2-3 |
| B. | 18-22 |
| C. | 6-8 |
| D. | 12-15 |
| Answer» D. 12-15 | |
| 5090. |
The ratio of lateral strain to linear strain is termed as the |
| A. | Poisson's ratio |
| B. | bulk modulus |
| C. | modulus of elasticity |
| D. | shear modulus |
| Answer» B. bulk modulus | |
| 5091. |
The distance between the centre of a rivet hole to the nearest edge of the plate is called |
| A. | pitch |
| B. | margin |
| C. | back pitch |
| D. | none of these |
| Answer» C. back pitch | |
| 5092. |
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the |
| A. | sensible heat differences are small, because the temperature changes from tray to tray is small. |
| B. | Trouton's rule is applicable. |
| C. | liquid/vapor loading across the column remains constant. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 5093. |
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap. |
| A. | 19 |
| B. | 38 |
| C. | 76 |
| D. | 95 |
| Answer» C. 76 | |
| 5094. |
for 90 elbow (medium radius) and 90 square elbow would be respectively around |
| A. | 25 and 60 |
| B. | 3 and 5 |
| C. | 100 and 250 |
| D. | 250 and 600 |
| Answer» B. 3 and 5 | |
| 5095. |
__________ heat exchanger is also known as 'hair pin type' exchanger, |
| A. | Double pipe |
| B. | Finned |
| C. | Plate type |
| D. | Regenerative |
| Answer» B. Finned | |
| 5096. |
What is the value of 'q' for saturated vapor feed to a distillation column ?(where q = fraction of the feed stream that is liquid.) |
| A. | 0 |
| B. | 1 |
| C. | <0 |
| D. | > 1 |
| Answer» B. 1 | |
| 5097. |
In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» C. 2.5 | |
| 5098. |
Frame thickness in the plate and frame filter press is normally in the range of __________ inches. |
| A. | 0.25 to 4 |
| B. | 0.25 to 8 |
| C. | 1 to 5 |
| D. | 1 to 12 |
| Answer» C. 1 to 5 | |
| 5099. |
In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter. |
| A. | two |
| B. | five |
| C. | ten |
| D. | twenty |
| Answer» B. five | |
| 5100. |
Longitundinal stress induced in a thin walled cylindrical storage vessel is |
| A. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/592-394-3.png"> | |