MCQOPTIONS
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MCQOPTIONS
This section includes 1608 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1051. |
A fluidis moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec. |
| A. | 7 |
| B. | 700 |
| C. | 7000 |
| D. | 630 |
| Answer» B. 700 | |
| 1052. |
Vane anemometer |
| A. | is an area meter. |
| B. | is a variable head meter. |
| C. | rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1053. |
The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as |
| A. | evaporation |
| B. | cavitation |
| C. | sublimation |
| D. | stripping |
| Answer» C. sublimation | |
| 1054. |
Cavitation can be prevented by |
| A. | suitably designing the pump. |
| B. | maintaining the suction head sufficiently greater than the vapour pressure. |
| C. | maintaining suction head = developed head. |
| D. | maintaining suction head lower than the vapour pressure. |
| Answer» C. maintaining suction head = developed head. | |
| 1055. |
Cavitation in a centrifugal pump results from |
| A. | high discharge pressure |
| B. | low barometric pressure |
| C. | high discharge velocity |
| D. | high discharge rate |
| Answer» C. high discharge velocity | |
| 1056. |
The ratio of width to depth for the most economical rectangular section in open channel flow is |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1057. |
A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is |
| A. | 20 m/sec |
| B. | 10 m/sec |
| C. | 52 m/sec |
| D. | 5 m/sec |
| Answer» C. 52 m/sec | |
| 1058. |
Gradually varying fluid flow is an example of __________ flow. |
| A. | non-steady uniform |
| B. | non-steady non-uniform |
| C. | steady uniform |
| D. | steady non-uniform |
| Answer» B. non-steady non-uniform | |
| 1059. |
Which of the following assumptions enables the Euler's equation of motion to be integrated ? |
| A. | The fluid is incompressible. |
| B. | The fluid is non-viscous. |
| C. | The continuity equation is satisfied. |
| D. | The flow is rotational and incompressible. |
| Answer» B. The fluid is non-viscous. | |
| 1060. |
When the water is warm, the height to which it can be lifted by a pump |
| A. | decreases due to reduced viscosity. |
| B. | decreases due to reduced vapour pressure. |
| C. | increases due to increased vapour pressure |
| D. | decreases due to increased frictional resistance. |
| Answer» C. increases due to increased vapour pressure | |
| 1061. |
The Stoke's stream function applies to the |
| A. | irrotational flow only. |
| B. | ideal/non-viscous fluids only. |
| C. | cases of axial symmetry. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1062. |
A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be |
| A. | 8400 Pa/m |
| B. | 12600 Pa/m |
| C. | 18900 Pa/m |
| D. | 16800 Pa/m |
| Answer» C. 18900 Pa/m | |
| 1063. |
Check valves are used |
| A. | at high pressure. |
| B. | in bends. |
| C. | for controlling water flow. |
| D. | for unidirectional flow. |
| Answer» E. | |
| 1064. |
A pipe is defined as 'hydraulically smooth', if the friction factor |
| A. | is not a function of Reynolds number. |
| B. | for a given Reynolds number remains constant even on further smoothening of the pipe. |
| C. | is zero irrespective of the Reynolds number. |
| D. | none of these. |
| Answer» C. is zero irrespective of the Reynolds number. | |
| 1065. |
A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double |
| A. | head |
| B. | discharge |
| C. | efficiency |
| D. | none of these |
| Answer» C. efficiency | |
| 1066. |
Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller. |
| A. | radius of |
| B. | speed of |
| C. | fluid velocity leaving |
| D. | none of these |
| Answer» E. | |
| 1067. |
Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe. |
| A. | diameter |
| B. | colour |
| C. | altitude |
| D. | none of these |
| Answer» C. altitude | |
| 1068. |
Purpose of hydraulic accumulator is to |
| A. | ensure intermittant supply of hydraulic pressure. |
| B. | increase the pressure and store/ accumulate it. |
| C. | accumulate pressure to increase force. |
| D. | generate high pressure to operate hydraulic machines like cranes, lifts, presses etc |
| Answer» E. | |
| 1069. |
The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its |
| A. | absolute viscosity. |
| B. | ratio of absolute viscosity to density. |
| C. | density. |
| D. | Reynolds number. |
| Answer» C. density. | |
| 1070. |
A streamline is a line in flow field, |
| A. | that is traced by all the fluid particles passing through a given point. |
| B. | along which a fluid particle travels. |
| C. | such that at every point on it, the velocity is tangential to it. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1071. |
Propellers are |
| A. | axial flow mixers. |
| B. | low speed impeller. |
| C. | used for mixingliquids of high viscosity. |
| D. | radial flow mixers. |
| Answer» B. low speed impeller. | |
| 1072. |
In magnetic flow meters, voltage generation is |
| A. | due to the motion of conducting fluid through an externally generated uniform field. |
| B. | proportional to the fluid velocity. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1073. |
Which of the following quantities are computed by using the hydraulic radius for non-circular ducts ? |
| A. | Velocity and relative roughness. |
| B. | Head loss and velocity. |
| C. | Reynold number, relative roughness and head loss. |
| D. | Reynolds number and friction factor. |
| Answer» D. Reynolds number and friction factor. | |
| 1074. |
Upto what value of 'Mach number', a fluid may be considered as incompressible ? |
| A. | 0.03 |
| B. | 0.3 |
| C. | 3 |
| D. | 10 |
| Answer» C. 3 | |
| 1075. |
An ideal nozzle design aims at |
| A. | minimising wall friction. |
| B. | suppressing boundary layer separation. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1076. |
In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is |
| A. | 0.5 |
| B. | 0.84 |
| C. | 1.84 |
| D. | 1.25 |
| Answer» D. 1.25 | |
| 1077. |
Boiler feed water pump is usually a __________ pump. |
| A. | reciprocating |
| B. | gear |
| C. | multistage centrifugal |
| D. | diaphragm |
| Answer» D. diaphragm | |
| 1078. |
The ratio of inertial forces to elastic forces is called the __________ number. |
| A. | Reynolds |
| B. | Mach |
| C. | Euler |
| D. | Weber |
| Answer» C. Euler | |
| 1079. |
What is the unit of kinematic viscosity in SI unit ? |
| A. | M2/sec |
| B. | N/m2 . sec |
| C. | Kg . sec/m |
| D. | None of these |
| Answer» B. N/m2 . sec | |
| 1080. |
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)$ |
| A. | 1/μ |
| B. | μ |
| C. | μ2 |
| D. | 1/μ2 |
| Answer» C. Œº2 | |
| 1081. |
Normal depth in open channel flow is the depth of flow in the channel |
| A. | corresponding to uniform flow. |
| B. | measured normal to the channel bed. |
| C. | corresponding to steady flow. |
| D. | none of these. |
| Answer» B. measured normal to the channel bed. | |
| 1082. |
In continuous fluidisation |
| A. | solids are completely entrained. |
| B. | the pressure drop is less than that for batch fluidisation. |
| C. | there is no entrainment of solids. |
| D. | velocity of the fluid is very small. |
| Answer» B. the pressure drop is less than that for batch fluidisation. | |
| 1083. |
The discharge through a venturimeter depends upon |
| A. | pressure drop only. |
| B. | its orientation. |
| C. | co-efficient of contraction only. |
| D. | none of these. |
| Answer» B. its orientation. | |
| 1084. |
Diaphragm valves are used for handling __________ fluids. |
| A. | corrosive |
| B. | viscous |
| C. | non-Newtonion |
| D. | solid suspended |
| Answer» B. viscous | |
| 1085. |
The speed of a sound wave in a gas is analogous to the speed of |
| A. | an elementary wave in an open channel. |
| B. | flow in an open channel. |
| C. | a disturbance travelling upstream in moving fluid. |
| D. | none of these. |
| Answer» B. flow in an open channel. | |
| 1086. |
Existence of boundary layer in fluid flow is because of the |
| A. | surface tension |
| B. | fluid density |
| C. | fluid viscosity |
| D. | gravity forces |
| Answer» D. gravity forces | |
| 1087. |
In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is |
| A. | the velocity of sound. |
| B. | dependent on its cross-sectional area. |
| C. | dependent on fluid viscosity. |
| D. | dependent on fluid density. |
| Answer» B. dependent on its cross-sectional area. | |
| 1088. |
Centrifugal pump can't be used to pump |
| A. | molten sodium (used as a coolant in Fast Breeder Reactor). |
| B. | moderately viscous vegetable oil used in soap industry. |
| C. | thick molten soap at 80°C. |
| D. | none of the above. |
| Answer» D. none of the above. | |
| 1089. |
A hydraulic accumulator comprises of |
| A. | a storage device and a control valve. |
| B. | a cylinder and a plunger. |
| C. | two pistons and two cylinders. |
| D. | a storage tank and a ram pump. |
| Answer» C. two pistons and two cylinders. | |
| 1090. |
Centrifugal compressors compared to reciprocating compressors |
| A. | require less space. |
| B. | have quieter operation. |
| C. | have lower operating costs. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1091. |
Medium viscosity lubricating oil can be most ideally pumped by a __________ pump. |
| A. | vane |
| B. | piston |
| C. | centrifugal |
| D. | plunger |
| Answer» B. piston | |
| 1092. |
Slugging occurs in a fluidised bed, if the bed is |
| A. | narrow |
| B. | deep |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1093. |
A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | data insufficient to predict |
| Answer» C. remain same | |
| 1094. |
Mach number is the ratio of the speed of the |
| A. | fluid to that of the light. |
| B. | light to that of the fluid. |
| C. | fluid to that of the sound. |
| D. | sound to that of the fluid. |
| Answer» D. sound to that of the fluid. | |
| 1095. |
Interstage coolers are provided in a multistage compressor to |
| A. | save power in compressing a given volume to a given pressure. |
| B. | cool the delivered air. |
| C. | achieve the exact delivery pressure. |
| D. | none of these. |
| Answer» B. cool the delivered air. | |
| 1096. |
An equipotential line is __________ to the velocity vector at every point. |
| A. | normal |
| B. | normal |
| C. | tangential |
| D. | none of these |
| Answer» B. normal | |
| 1097. |
Pascal's law is valid, only when the fluid is |
| A. | frictionless and at rest. |
| B. | at rest. |
| C. | at rest and when the frictionless fluid is in motion. |
| D. | none of these. |
| Answer» C. at rest and when the frictionless fluid is in motion. | |
| 1098. |
In an incompressible flow of fluid, the fluid |
| A. | temperature remains constant. |
| B. | compressibility is greater than zero. |
| C. | density does not change with pressure & temperature. |
| D. | is frictionless. |
| Answer» D. is frictionless. | |
| 1099. |
The head loss due to sudden contraction is proportional to |
| A. | velocity |
| B. | velocity head |
| C. | turbulence |
| D. | none of these |
| Answer» C. turbulence | |
| 1100. |
If more than two branches of pipes are to be connected at the same point, then use a/an |
| A. | elbow |
| B. | union |
| C. | tee |
| D. | none of these. |
| Answer» D. none of these. | |