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.
| 1251. |
The simple pitot tube measures the __________ pressure. |
| A. | static |
| B. | dynamic |
| C. | total |
| D. | none of these |
| Answer» D. none of these | |
| 1252. |
Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible ? |
| A. | < 0.3 |
| B. | > 3 |
| C. | 50 |
| D. | 1 |
| Answer» B. > 3 | |
| 1253. |
The pressure intensity is the same in all directions at a point in a fluid |
| A. | only when the fluid is frictionless. |
| B. | only when the fluid is at rest having zero velocity. |
| C. | when there is no motion of one fluid layer relative to an adjacent layer. |
| D. | regardless of the motion of one fluid layer relative to an adjacent layer. |
| Answer» D. regardless of the motion of one fluid layer relative to an adjacent layer. | |
| 1254. |
In case of centrifugal fan or blower, the gas capacity varies as |
| A. | speed |
| B. | (speed)2 |
| C. | (speed)3 |
| D. | (speed)0.5 |
| Answer» B. (speed)2 | |
| 1255. |
The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the |
| A. | length is shorter. |
| B. | throat diameter is more. |
| C. | sudden expansion of flow in the downstream occurs. |
| D. | distance between the throat and the inlet is more. |
| Answer» D. distance between the throat and the inlet is more. | |
| 1256. |
Toothpaste is a |
| A. | Bingham plastic |
| B. | pseudoplastic |
| C. | Newtonion liquid |
| D. | dilatent |
| Answer» E. | |
| 1257. |
Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm. |
| A. | < 4 |
| B. | > 4 |
| C. | > 12.5 |
| D. | < 10 |
| Answer» D. < 10 | |
| 1258. |
Unsteady non-uniform flow is represented by flow through a/an |
| A. | long pipe at constant rate. |
| B. | long pipe at decreasing rate. |
| C. | expanding tube at increasing rate. |
| D. | expanding tube at constant rate. |
| Answer» D. expanding tube at constant rate. | |
| 1259. |
Volute type of casing is provided in a centrifugal pump to |
| A. | convert velocity head to pressure head. |
| B. | convert pressure head to velocity head, |
| C. | reduce the discharge fluctuation. |
| D. | increase the discharge. |
| Answer» E. | |
| 1260. |
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)$ |
| A. | d |
| B. | 1/d |
| C. | σ |
| D. | l/σ |
| Answer» D. l/œÉ | |
| 1261. |
Drag force acting on a body does not depend upon the |
| A. | density of the fluid. |
| B. | density of the body. |
| C. | velocity of the body. |
| D. | projected area of the body. |
| Answer» C. velocity of the body. | |
| 1262. |
Bernoulli's equation for steady, frictionless, continuous flow states that the __________ at all sections is same. |
| A. | total pressure |
| B. | total energy |
| C. | velocity head |
| D. | none of these |
| Answer» C. velocity head | |
| 1263. |
Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter. |
| A. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 1264. |
The equation given below is called the __________ . f-0.5 = 4.07 loge (NRef)-0.6 |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | none of these |
| Answer» C. Fanning equation | |
| 1265. |
A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres. |
| A. | 600 |
| B. | 660 |
| C. | 1.1 |
| D. | 60 |
| Answer» C. 1.1 | |
| 1266. |
The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is |
| A. | 0.1 |
| B. | 0.5 |
| C. | 0.94 |
| D. | 1 |
| Answer» C. 0.94 | |
| 1267. |
In the low Reynolds number region, the drag force on a sphere is proportional to |
| A. | V |
| B. | V2 |
| C. | V4 |
| D. | V0.5 |
| Answer» B. V2 | |
| 1268. |
Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float) |
| A. | Df + Bf = Wf |
| B. | Df = Bf + Wf |
| C. | Df + Bf + Wf =0 |
| D. | none of these |
| Answer» B. Df = Bf + Wf | |
| 1269. |
Creeping flow around a sphere is defined, when particle Reynolds number is |
| A. | < 2100 |
| B. | < 0.1 |
| C. | > 2.5 |
| D. | < 500 |
| Answer» C. > 2.5 | |
| 1270. |
Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. |
| A. | elastic |
| B. | viscous |
| C. | gravity |
| D. | none of these |
| Answer» B. viscous | |
| 1271. |
Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' diamensions, the quantities can be arranged into __________ independent dimensionless parameters.$ |
| A. | m |
| B. | n |
| C. | n-m |
| D. | n/m |
| Answer» D. n/m | |
| 1272. |
Check in a centrifugal pump is |
| A. | provided in the discharge line. |
| B. | generally a globe valve. |
| C. | provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1273. |
Which law is followed by the velocity distribution in the turbulent boundary layer? |
| A. | Parabolic law |
| B. | Linear law |
| C. | Logarithmic law |
| D. | None of these |
| Answer» D. None of these | |
| 1274. |
Which of the following equations is valid for laminar flow of a fluid through packed bed? |
| A. | Fanning equation |
| B. | Kozney - Karman equation |
| C. | Hagen-Poiseuille equation |
| D. | Blake-Plummer equation |
| Answer» C. Hagen-Poiseuille equation | |
| 1275. |
Which of the following exemplifies a three dimensional fluid flow ? |
| A. | Fluid flow at the inlet to a nozzle |
| B. | Fluid flow between parallel plates |
| C. | Viscous fluid flow between converging plates |
| D. | None of these |
| Answer» B. Fluid flow between parallel plates | |
| 1276. |
A rectangular surface 3' x 4', has the lower 3 edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is(where, y = specific weight of water) |
| A. | 39.6y |
| B. | 48y |
| C. | 49.2y |
| D. | 58y |
| Answer» C. 49.2y | |
| 1277. |
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to$ |
| A. | L ρv2/D |
| B. | L μ;V/D2 |
| C. | D ρv2/L |
| D. | μ V/L |
| Answer» B. L Œº;V/D2 | |
| 1278. |
Euler's equation of motion states, that at every point, the |
| A. | fluid momentum is constant. |
| B. | force per unit mass equals acceleration. |
| C. | rate of mass outflow is equal to the rate of mass inflow. |
| D. | none of these. |
| Answer» C. rate of mass outflow is equal to the rate of mass inflow. | |
| 1279. |
The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its |
| A. | viscosity |
| B. | specific volume |
| C. | velocity |
| D. | none of these |
| Answer» C. velocity | |
| 1280. |
During fluid flow, variation of shear stress(τ) with velocity gradientat constant pressure temperature is shown below in the figure In the above figure, Binghom plastic is represented by the curve .$ |
| A. | V |
| B. | II |
| C. | III |
| D. | I |
| Answer» C. III | |
| 1281. |
Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the |
| A. | back flow of fluid in the event of stoppage of pump. |
| B. | discharge pressure. |
| C. | flow of liquid during operation of the pump. |
| D. | all (a), (b) and (c). |
| Answer» B. discharge pressure. | |
| 1282. |
Two piping system are said to be equivalent, when the __________ are same. |
| A. | fluid flow rate & friction loss |
| B. | length & friction factor |
| C. | diameter & friction factor |
| D. | length & diameter |
| Answer» B. length & friction factor | |
| 1283. |
The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the |
| A. | barometric pressure |
| B. | speed of the impeller |
| C. | diameter of the impeller |
| D. | both (b) and (c) |
| Answer» B. speed of the impeller | |
| 1284. |
Priming of a centrifugal pump is done to |
| A. | increase the mass flow rate of fluid. |
| B. | develop effective pressure rise by the pump. |
| C. | avoid chances of separation inside the impeller. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1285. |
Flow measurement in an open channel is done by a/an |
| A. | venturimeter |
| B. | orificemeter |
| C. | weir |
| D. | rotameter |
| Answer» D. rotameter | |
| 1286. |
Mercury is an ideal barometric fluid mainly due to its |
| A. | high density. |
| B. | low compressibility. |
| C. | low capillary action. |
| D. | very low vapor pressure. |
| Answer» E. | |
| 1287. |
The speed of sound in an ideal gas varies as the |
| A. | temperature |
| B. | pressure |
| C. | density |
| D. | none of these |
| Answer» B. pressure | |
| 1288. |
Which of the following is dimensionless ? |
| A. | Angular velocity |
| B. | Fanning friction factor |
| C. | Specific volume |
| D. | None of these |
| Answer» C. Specific volume | |
| 1289. |
Boundary layer separation is caused by the |
| A. | reduction of pressure to vapour pressure. |
| B. | boundary layer thickness reducing to zero. |
| C. | adverse pressure gradient. |
| D. | reduction of pressure gradient to zero. |
| Answer» D. reduction of pressure gradient to zero. | |
| 1290. |
Which of the following valves will incur maximum pressure drop for the same discharge of water ? |
| A. | Globe valve |
| B. | Gate valve |
| C. | Needle valve |
| D. | Butterfly valve |
| Answer» D. Butterfly valve | |
| 1291. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) |
| A. | 1/M |
| B. | M |
| C. | 1/M |
| D. | M |
| Answer» B. M | |
| 1292. |
Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the |
| A. | wall roughness. |
| B. | Reynolds number. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1293. |
The discharge through a V-notch weir varies as |
| A. | H3/2 |
| B. | H1/2 |
| C. | H5/2 |
| D. | H2/3 |
| Answer» D. H2/3 | |
| 1294. |
Ratio of pressure and inertia force gives __________ number. |
| A. | Weber |
| B. | Mach |
| C. | Euler |
| D. | Froude |
| Answer» D. Froude | |
| 1295. |
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) |
| A. | d |
| B. | d2/3 |
| C. | d4/5 |
| D. | d1/3 |
| Answer» D. d1/3 | |
| 1296. |
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will |
| A. | increase. |
| B. | decrease. |
| C. | remain unchanged. |
| D. | increase or decrease depending on the pipe material. |
| Answer» B. decrease. | |
| 1297. |
Venturimeter and orificemeter measures the __________ of the fluid. |
| A. | pressure |
| B. | maximum velocity |
| C. | average velocity |
| D. | point velocity |
| Answer» D. point velocity | |
| 1298. |
Most of the centrifugal pumps used in chemical plants are usually __________ driven. |
| A. | steam |
| B. | diesel engine |
| C. | electric motor |
| D. | gas turbine |
| Answer» D. gas turbine | |
| 1299. |
The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is |
| A. | Q‚àùN : H‚àùN2 : P‚àùN3 |
| B. | Q‚àùN2 : H‚àùN3 : P‚àùN |
| C. | Q‚àùN : H‚àùN3 : P‚àùN2 |
| D. | Q‚àùN3 : H‚àùN : P‚àùN2 |
| Answer» B. Q‚àùN2 : H‚àùN3 : P‚àùN | |
| 1300. |
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 | |