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.
| 151. |
N²Re/NFr is called the __________ number. |
| A. | rinkman |
| B. | alileo |
| C. | rchimedes |
| D. | uler |
| Answer» C. rchimedes | |
| 152. |
__________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm². |
| A. | entrifugal |
| B. | iston |
| C. | lunger |
| D. | ane |
| Answer» D. ane | |
| 153. |
Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as |
| A. | 1.8 |
| B. | -0.2 |
| C. | 2.7 |
| D. | 2 |
| Answer» E. | |
| 154. |
What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10⁶ approximately? |
| A. | 0.003 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 0.3 |
| Answer» B. 0.01 | |
| 155. |
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation |
| A. | q/dx = K |
| B. | q/dx = K.q |
| C. | q/dx = K/q |
| D. | q/dx = Kq² |
| Answer» B. q/dx = K.q | |
| 156. |
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062. |
| A. | 0 m |
| B. | 1 m |
| C. | 2 m |
| D. | 0 m |
| Answer» C. 2 m | |
| 157. |
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant? |
| A. | otational |
| B. | nsteady |
| C. | urbulent |
| D. | on-uniform |
| Answer» E. | |
| 158. |
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is |
| A. | 0 |
| B. | 0 |
| C. | 5 |
| D. | 0 |
| Answer» C. 5 | |
| 159. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units)If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is |
| A. | 2 mm/s |
| B. | 6 mm/s |
| C. | 4 mm/s |
| D. | 8 mm/s |
| Answer» C. 4 mm/s | |
| 160. |
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air. |
| A. | πg/3 |
| B. | .01πgH/4 |
| C. | .01πgH/8 |
| D. | .04πgH/3 |
| Answer» B. .01πgH/4 | |
| 161. |
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 | |
| 162. |
__________ isused for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline.%! |
| A. | FL⁻²T, ML⁻¹T⁻¹ |
| B. | FLT, ML⁻¹T⁻¹ |
| C. | ML⁻¹T⁻³, F⁻¹L²T |
| D. | F-1L²T⁻¹, MLT⁻³ |
| Answer» B. FLT, ML‚Äö√Ö¬™¬¨œÄT‚Äö√Ö¬™¬¨œÄ | |
| 163. |
For flow through an orifice from a reservoir, the actual velocity at the vena con-tracta is given by%! |
| A. | ‚à ö(2gh) |
| B. | C.V. ‚à ö(2gh) |
| C. | Cd ‚à ö(2gh) |
| D. | Cc ‚à ö(2gh) |
| Answer» C. Cd ‚Äö√ √∂(2gh) | |
| 164. |
In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.%! |
| A. | Venturimeter |
| B. | Pressure gauge |
| C. | Pitot tube |
| D. | Orificemeter |
| Answer» D. Orificemeter | |
| 165. |
A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is%! |
| A. | 5 |
| B. | 14.1 |
| C. | 56.22 |
| D. | 28.2 |
| Answer» E. | |
| 166. |
Select the correct practical example of steady non-uniform flow.%! |
| A. | Manometric |
| B. | Mechanical |
| C. | Volumetric |
| D. | Overall |
| Answer» B. Mechanical | |
| 167. |
Foot valve provided in the pump is a __________ valve.%! |
| A. | Direction control |
| B. | Back pressure |
| C. | Relief |
| D. | Pressure reduction |
| Answer» C. Relief | |
| 168. |
At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump?%! |
| A. | Motion of water around a ship in a lake |
| B. | Motion of river around bridge piers |
| C. | Steadily decreasing flow through a reducing section |
| D. | Steadily increasing flow through a pipe |
| Answer» D. Steadily increasing flow through a pipe | |
| 169. |
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an |
| A. | Pitot tube |
| B. | Venturimeter |
| C. | Orificemeter |
| D. | Rotameter |
| Answer» B. Venturimeter | |
| 170. |
The ratio of pressure forces to inertial forces is called the __________ number. |
| A. | Froude |
| B. | Euler |
| C. | Reynold |
| D. | Mach |
| Answer» C. Reynold | |
| 171. |
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 | |
| 172. |
A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by%! |
| A. | Decreasing the size of the inlet pipe |
| B. | Increasing the size of the inlet pipe |
| C. | Lowering the pump position |
| D. | Both B and C |
| Answer» E. | |
| 173. |
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to%! |
| A. | ‚à öx |
| B. | 1/‚à öx |
| C. | X |
| D. | 1/x |
| Answer» B. 1/‚Äö√ √∂x | |
| 174. |
Enamels and paints are generally __________ fluid.%! |
| A. | Reheopectic |
| B. | Pseudo-plastic |
| C. | Thixotropic |
| D. | Dilatant |
| Answer» C. Thixotropic | |
| 175. |
Differential manometer measures the%! |
| A. | Atmospheric pressure |
| B. | Sub-atmospheric pressure |
| C. | Pressure difference between two points |
| D. | None of these |
| Answer» D. None of these | |
| 176. |
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m³ ) is to be fluidised by water (density 1000 kg/m³ ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is%! |
| A. | 4.4 KPa |
| B. | 2.94 KPa |
| C. | 3.7 KPa |
| D. | None of these |
| Answer» B. 2.94 KPa | |
| 177. |
A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)%! |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 178. |
Euler's equation of motion is a statement expressing%! |
| A. | Conservation of mass |
| B. | Conservation of energy |
| C. | Newton's first law of motion |
| D. | Newton's second law of motion |
| Answer» B. Conservation of energy | |
| 179. |
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 of the above |
| Answer» E. | |
| 180. |
Turbine impeller%! |
| A. | Produces only radial current |
| B. | Produces only tangential current |
| C. | Is effective over wide range of viscosities |
| D. | Does not produce tangential current |
| Answer» D. Does not produce tangential current | |
| 181. |
Cp/Cv is termed as%! |
| A. | Adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 182. |
Potential flow is the flow of%! |
| A. | Compressible fluids with shear |
| B. | Compressible fluids with no shear |
| C. | Incompressible fluids with shear |
| D. | Incompressible fluids with no shear |
| Answer» E. | |
| 183. |
The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by%! |
| A. | 2xy/(x+y) |
| B. | xy/(x+y) |
| C. | (x+y)/2xy |
| D. | (x+y)/xy |
| Answer» B. xy/(x+y) | |
| 184. |
Diaphragm pumps are used to transport%! |
| A. | Solids |
| B. | Liquids |
| C. | Fluids |
| D. | Slurries |
| Answer» E. | |
| 185. |
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of%! |
| A. | Powder & grannular solids |
| B. | Liquids |
| C. | Low melting point semi-solids |
| D. | All of the above |
| Answer» E. | |
| 186. |
The capacity of a centrifugal pump Can be increased by increasing the%! |
| A. | Impeller diameter or speed |
| B. | Number of pumps and joining them in series |
| C. | Number of pumps and joining them in parallel |
| D. | All of the above |
| Answer» E. | |
| 187. |
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.%! |
| A. | Brings about no further reduction of |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 188. |
Net positive suction head (NPSH) of a centrifugal pump must be%! |
| A. | Greater than the vapour pressure of the liquid |
| B. | Less than the vapour pressure of the liquid |
| C. | Equal to the vapour pressure of the liquid |
| D. | Less than barometric pressure |
| Answer» B. Less than the vapour pressure of the liquid | |
| 189. |
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is%! |
| A. | < 1 |
| B. | 1 |
| C. | > 1 |
| D. | 2 |
| Answer» B. 1 | |
| 190. |
What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» B. 1 | |
| 191. |
The friction factor for turbulent flow in a hydraulically smooth pipe%! |
| A. | Depends only on Reynolds number |
| B. | Does not depend on Reynolds number |
| C. | Depends on the roughness |
| D. | None of these |
| Answer» B. Does not depend on Reynolds number | |
| 192. |
One stoke (unit of kinematic viscosity) is equivalent to%! |
| A. | 1 cm²/second |
| B. | 1 m²/second |
| C. | 1 gm/cm. second |
| D. | 1 kg . m/second |
| Answer» B. 1 m¬¨‚â§/second | |
| 193. |
Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f‚ÇÅ and that for smooth pipe is f‚ÇÇ. Pick out the correct statement.%! |
| A. | f‚ÇÅ = f‚ÇÇ |
| B. | f‚ÇÅ < f‚ÇÇ |
| C. | f‚ÇÅ > f‚ÇÇ |
| D. | Data not sufficient to relate f‚ÇÅ & f‚ÇÇ |
| Answer» D. Data not sufficient to relate f‚Äö√á√Ö & f‚Äö√á√á | |
| 194. |
Hydraulic intensifier is used for increasing the%! |
| A. | Rate of velocity of liquid supply |
| B. | Rate of flow through delivery pipeline of a pump |
| C. | Intensity of pressure of the liquid |
| D. | Momentum rate through delivery pipe |
| Answer» D. Momentum rate through delivery pipe | |
| 195. |
The line traced by a single fluid particle as it moves over a period of time is called __________ line.%! |
| A. | Stream |
| B. | Path |
| C. | Equipotential |
| D. | None of these |
| Answer» C. Equipotential | |
| 196. |
The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is%! |
| A. | 0.1 |
| B. | 0.55 |
| C. | 0.95 |
| D. | 1.85 |
| Answer» D. 1.85 | |
| 197. |
Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the%! |
| A. | Drag on particles |
| B. | Drag on coloumn walls |
| C. | Bed height |
| D. | Bed voidage |
| Answer» D. Bed voidage | |
| 198. |
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will%! |
| A. | Decrease |
| B. | Increase |
| C. | Remain same |
| D. | Unpredictable |
| Answer» B. Increase | |
| 199. |
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an%! |
| A. | Pitot tube |
| B. | Venturimeter |
| C. | Orificemeter |
| D. | Rotameter |
| Answer» B. Venturimeter | |
| 200. |
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 | |