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.
| 901. |
Which of the following is a dimensionless parameter ? |
| A. | Angular velocity |
| B. | Specific weight |
| C. | Kinematic viscosity |
| D. | None of these |
| Answer» E. | |
| 902. |
Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings. |
| A. | incompressible |
| B. | non-viscous |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 903. |
The boundary layer is that part of a moving fluid, in which the fluid velocity is |
| A. | affected by the fluid flow pressure. |
| B. | constant. |
| C. | affected by the presence of a solid boundary. |
| D. | all (a), (b) and (c). |
| Answer» D. all (a), (b) and (c). | |
| 904. |
For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to |
| A. | R |
| B. | R2 |
| C. | R4 |
| D. | R0.5 |
| Answer» D. R0.5 | |
| 905. |
Equivalent length of a pipe fitting is |
| A. | dependent on Reynolds number. |
| B. | independent of Reynolds number. |
| C. | dependent on the length of the pipe. |
| D. | none of these. |
| Answer» B. independent of Reynolds number. | |
| 906. |
Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent.$ |
| A. | 1.3770833333333 |
| B. | 50 |
| C. | 66.6 |
| D. | 88.8 |
| Answer» D. 88.8 | |
| 907. |
Bernoulli's equation describes the |
| A. | mechanical energy balance in potential flow. |
| B. | kinetic energy balance in laminar flow. |
| C. | mechanical energy balance in turbulent flow. |
| D. | mechanical energy balance in boundary layer. |
| Answer» B. kinetic energy balance in laminar flow. | |
| 908. |
Bernoulli's equation is dependent on the |
| A. | first law of thermodynamics. |
| B. | third law of thermodynamics. |
| C. | law of conservation of momentum. |
| D. | none of these. |
| Answer» E. | |
| 909. |
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re |
| A. | increases linearly with V. |
| B. | decreases linearly with V. |
| C. | decreases as V2. |
| D. | none of these. |
| Answer» B. decreases linearly with V. | |
| 910. |
The uniformity of a gas fluidised bed depends upon the __________ of the solid particles. |
| A. | size |
| B. | surface properties |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 911. |
Stoke's law is valid, when NRe, p is less than |
| A. | 2 |
| B. | 100 |
| C. | 2100 |
| D. | 700 |
| Answer» B. 100 | |
| 912. |
Pressure gradient in the pipe flow is influenced by the |
| A. | diameter of pipe. |
| B. | velocity of the fluid. |
| C. | density & viscosity of the fluid. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 913. |
The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is |
| A. | hyperbolic |
| B. | parabolic |
| C. | linear |
| D. | none of these |
| Answer» C. linear | |
| 914. |
Speed of sound in an ideal gas depends on its |
| A. | temperature |
| B. | pressure |
| C. | specific volume |
| D. | none of these |
| Answer» B. pressure | |
| 915. |
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the |
| A. | pipe length |
| B. | fluid velocity in the pipe |
| C. | time taken to close the valve |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 916. |
The centre of pressure is |
| A. | always below the centroid of the area. |
| B. | always above the centroid of the area. |
| C. | a point on the line of action of the resultant force. |
| D. | at the centroid of the submerged area. |
| Answer» D. at the centroid of the submerged area. | |
| 917. |
Which of the following has the minimum compressibility ? |
| A. | Water at room temperature |
| B. | Air at room temperature |
| C. | Oxygen at room temperature |
| D. | Nitrogen at room temperature |
| Answer» B. Air at room temperature | |
| 918. |
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).$ |
| A. | Re |
| B. | Re |
| C. | 1/Re |
| D. | Re-1/2 |
| Answer» E. | |
| 919. |
A centrifugal pump is called a turbine pump, if it is having a |
| A. | turbine type impeller. |
| B. | vaned diffusion casing. |
| C. | rotating vaned volute. |
| D. | none of these. |
| Answer» C. rotating vaned volute. | |
| 920. |
Experimental study of laminar fluid flow through a circular tube was conducted by |
| A. | Reynolds |
| B. | Hagen and Poiseuille |
| C. | Pascal |
| D. | Blake-Plummer |
| Answer» C. Pascal | |
| 921. |
High specific speed of a pump implies that, it is a/an __________ pump. |
| A. | centrifugal |
| B. | mixed flow |
| C. | axial flow |
| D. | none of these |
| Answer» D. none of these | |
| 922. |
Actual lift of a pump is always less than the theoretical lift and is limited by the |
| A. | specific gravity & temperature of the liquid. |
| B. | leakage & pressure decreasing at higher elevations. |
| C. | frictional resistance through pipes, fittings & passages. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 923. |
In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? |
| A. | Discharge of water by a centrifugal pump being run at a constant rpm. |
| B. | Water flow in the suction and discharge pipe of a reciprocating pump. |
| C. | Water discharge from a vertical vessel in which constant level is maintained. |
| D. | Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe. |
| Answer» C. Water discharge from a vertical vessel in which constant level is maintained. | |
| 924. |
Working of a __________ pump characterises mixed flow. |
| A. | turbine |
| B. | piston |
| C. | diaphragm |
| D. | none of these |
| Answer» B. piston | |
| 925. |
The pump impeller and the turbine runner in a hydraulic torque converter |
| A. | have the same diameter. |
| B. | have different diameters. |
| C. | are directly coupled. |
| D. | none of these. |
| Answer» C. are directly coupled. | |
| 926. |
Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about |
| A. | 0.42 |
| B. | 0.62 |
| C. | 0.82 |
| D. | 0.98 |
| Answer» C. 0.82 | |
| 927. |
Cavitation in a centrifugal pump can be avoided by keeping the |
| A. | inlet pressure high |
| B. | outlet pressure low |
| C. | inlet pressure low |
| D. | outlet pressure high |
| Answer» B. outlet pressure low | |
| 928. |
With increase in the temperature, viscosity of a liquid |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increase or decrease; depends on the liquid |
| Answer» C. remains constant | |
| 929. |
Scale up of agitator design requires |
| A. | geometrical similarity only. |
| B. | dynamic similarity only. |
| C. | both geometrical and dynamic similarity. |
| D. | all geometrical, dynamic and kinematic similarity. |
| Answer» E. | |
| 930. |
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature. |
| A. | lower than |
| B. | higher than |
| C. | equal to |
| D. | none of these |
| Answer» C. equal to | |
| 931. |
Which of the following is not dimension-less? |
| A. | Froude number |
| B. | Kinematic viscosity |
| C. | Pressure co-efficient |
| D. | None of these |
| Answer» C. Pressure co-efficient | |
| 932. |
The Prandtl mixing length is |
| A. | zero at the pipe wall and is a universal constant. |
| B. | independent of radial distance from the pipe axis. |
| C. | independent of the shear stress. |
| D. | useful for computing laminar flow problems. |
| Answer» E. | |
| 933. |
Erosion and pits formation on the impeller of a centrifugal pump may be due to |
| A. | cavitation. |
| B. | low speed of impeller. |
| C. | its operation with delivery valve closed for considerable time after starting the pump. |
| D. | off centering of pump with motor. |
| Answer» B. low speed of impeller. | |
| 934. |
Propeller type centrifugal pumps are most suitable for |
| A. | high capacity at high heads. |
| B. | high capacity at low heads. |
| C. | low capacity at high heads. |
| D. | low capacity at low heads. |
| Answer» C. low capacity at high heads. | |
| 935. |
The Reynolds number for an ideal fluid flow is |
| A. | 4 |
| B. | 2100-4000 |
| C. | 4000 |
| D. | ‚àû |
| Answer» E. | |
| 936. |
The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is |
| A. | 1.3 |
| B. | 0.766 |
| C. | 0.87 |
| D. | none of these |
| Answer» C. 0.87 | |
| 937. |
Multistage compressors are used in industry, because they |
| A. | reduce the cost of compressor. |
| B. | reduce the size requirement, |
| C. | resemble closely to isothermal compression. |
| D. | are easy to control. |
| Answer» D. are easy to control. | |
| 938. |
Which is the most efficient and best for measuring very small flow rate of gases ? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Rotameter |
| D. | Flow nozzle |
| Answer» D. Flow nozzle | |
| 939. |
Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head. |
| A. | manometric |
| B. | total |
| C. | static |
| D. | friction |
| Answer» B. total | |
| 940. |
For ideally incompressible fluid, the Mach number will be |
| A. | 1.5 |
| B. | 1 |
| C. | 0 |
| D. | 5 |
| Answer» C. 0 | |
| 941. |
With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | increases exponentially |
| Answer» C. remains unchanged | |
| 942. |
Priming is needed in a __________ pump. |
| A. | reciprocating |
| B. | gear |
| C. | centrifugal |
| D. | diaphragm |
| Answer» D. diaphragm | |
| 943. |
Which of the following is used for pumping crude oil from oil well ? |
| A. | Single stage centrifugal pump |
| B. | Gear pump |
| C. | Screw pump |
| D. | Duplex/triplex reciprocating pump |
| Answer» E. | |
| 944. |
The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid. |
| A. | Newtonion |
| B. | pseudoplastic |
| C. | dilatent |
| D. | Bingham plastic |
| Answer» C. dilatent | |
| 945. |
In turbulent flow, the |
| A. | fluid particles move in an orderly manner. |
| B. | momentum transfer is on molecular scale only. |
| C. | shear stress is caused more effectively by cohesion than momentum transfer. |
| D. | shear stresses are generally larger than in a similar laminar flow. |
| Answer» E. | |
| 946. |
The temperature in isentropic flow |
| A. | does not depend on Mach number. |
| B. | depends on Mach number only. |
| C. | cannot drop and then increase again downstream. |
| D. | none of these. |
| Answer» C. cannot drop and then increase again downstream. | |
| 947. |
In hindered settling, the particles are |
| A. | placed farther from the wall. |
| B. | not affected by other particles and the wall. |
| C. | near each other, |
| D. | none of these. |
| Answer» D. none of these. | |
| 948. |
In deriving Bernoulli's equation, fluid is assumed to be |
| A. | incompressible, frictionless, steady, along a streamline. |
| B. | uniform, steady, incompressible, along a streamline. |
| C. | steady, density being pressure dependent, frictionless. |
| D. | none of these. |
| Answer» B. uniform, steady, incompressible, along a streamline. | |
| 949. |
Three piping networks as shown in the figure are placed horizontally. They are made using identical pipe segments and are subjected to the same pressure drop across them. Assuming no pressure losses at junctions, the flow rates across the three networks are related as Q1 : Q2 : Q3. |
| A. | 0.043773148148148 |
| B. | 0.043090277777778 |
| C. | 0.043078703703704 |
| D. | 0.043078703703704 |
| Answer» D. 0.043078703703704 | |
| 950. |
Centrifugal pump is normally classified on the basis of the |
| A. | rpm. |
| B. | type of casing. |
| C. | impeller blade angle. |
| D. | number of blades in impeller. |
| Answer» C. impeller blade angle. | |