MCQOPTIONS
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MCQOPTIONS
This section includes 2158 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 1401. |
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 | |
| 1402. |
Dean number is concerned with the |
| A. | Fluid-particle interaction |
| B. | Fluid flow through helical pipes |
| C. | Power consumption in agitated vessels |
| D. | Psychrometry |
| Answer» C. Power consumption in agitated vessels | |
| 1403. |
Baffles in mixing tanks are provided to |
| A. | Reduce swirling and vortex formation |
| B. | Increase the structural strength of the tank |
| C. | Aid in rotational flow |
| D. | None of these |
| Answer» B. Increase the structural strength of the tank | |
| 1404. |
The continuity equation in ideal fluid flow states that |
| A. | Net rate of inflow into any small volume must be zero |
| B. | Energy is not constant along a streamline |
| C. | Energy is constant along a streamline |
| D. | There exists a velocity potential |
| Answer» B. Energy is not constant along a streamline | |
| 1405. |
Acceleration head in a reciprocating pump |
| A. | Increases the work done during delivery stroke |
| B. | Decreases the work done during suction stroke |
| C. | Does not change the work requirement of the pump |
| D. | Increases the work done during suction stroke |
| Answer» D. Increases the work done during suction stroke | |
| 1406. |
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 | |
| 1407. |
Forces acting on a particle settling in fluid are __________ forces. |
| A. | Gravitational & buoyant |
| B. | Centrifugal & drag |
| C. | Gravitational or centrifugal buoyant drag |
| D. | External, drag & viscous |
| Answer» D. External, drag & viscous | |
| 1408. |
Paper pulp is an example of __________ fluid. |
| A. | Dilatant |
| B. | Bingham plastic |
| C. | Newtonion |
| D. | Pseudoplastic |
| Answer» C. Newtonion | |
| 1409. |
Rubber latex is an example of __________ fluid. |
| A. | Dilatent |
| B. | Newtonion |
| C. | Pseudoplastic |
| D. | Bingham plastic |
| Answer» D. Bingham plastic | |
| 1410. |
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 | |
| 1411. |
In a stabilised soap bubble, pressure inside it compared to external pressure is |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Unpredictable |
| Answer» B. Less | |
| 1412. |
In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure. |
| A. | Rotameter |
| B. | Pitot tube |
| C. | Venturimeter |
| D. | Flow nozzle |
| Answer» C. Venturimeter | |
| 1413. |
With increase in pump speed, its NPSH requirement |
| A. | Decreases |
| B. | Increases |
| C. | Remains unaltered |
| D. | Can either increase or decrease ; depends on other factors |
| Answer» C. Remains unaltered | |
| 1414. |
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type. |
| A. | Axial |
| B. | Radial |
| C. | Mixed |
| D. | None of these |
| Answer» B. Radial | |
| 1415. |
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 | |
| 1416. |
Hot wire anemometer is used to measure the |
| A. | Velocity of liquids |
| B. | Temperature of liquids |
| C. | Velocity of gases |
| D. | Pressure of liquids |
| Answer» D. Pressure of liquids | |
| 1417. |
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 | |
| 1418. |
The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is |
| A. | Parabolic |
| B. | Flat |
| C. | Flat near the wall and parabolic in the middle |
| D. | Parabolic near the wall and flat in the middle |
| Answer» E. | |
| 1419. |
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. | |
| 1420. |
Location of vena-contracta in an orificemeter does not depend upon the |
| A. | Type of orifice |
| B. | Density, viscosity & compressibility of the fluid |
| C. | Ratio of pipe diameter to orifice diameter |
| D. | Pipe roughness |
| Answer» B. Density, viscosity & compressibility of the fluid | |
| 1421. |
The discharge co-efficient for an orificemeter does not depend upon the |
| A. | Pipe length |
| B. | Ratio of pipe diameter to orifice diameter |
| C. | Type of orifice & the Reynolds number |
| D. | Pipe diameter |
| Answer» B. Ratio of pipe diameter to orifice diameter | |
| 1422. |
Pick out the wrong statement pertaining to fluid flow. |
| A. | The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5 |
| B. | The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe |
| C. | Navier-Stokes equation is applicable to the analysis of viscous flows |
| D. | Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids |
| Answer» B. The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe | |
| 1423. |
A centrifugal pump has the following specifications:Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, the power consumed now will be __________ hp. |
| A. | 0.5 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» B. 2 | |
| 1424. |
Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent. |
| A. | 33:3 |
| B. | 50 |
| C. | 66.6 |
| D. | 88.8 |
| Answer» D. 88.8 | |
| 1425. |
For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is |
| A. | 0.5 |
| B. | 1 |
| C. | 0.66 |
| D. | < 0.5 |
| Answer» C. 0.66 | |
| 1426. |
Minimum porosity for fluidisation is |
| A. | That corresponding to static bed |
| B. | That corresponding to completely fluidised bed |
| C. | The porosity of the bed when true fluidisation begins |
| D. | Less than that of the' static bed |
| Answer» D. Less than that of the' static bed | |
| 1427. |
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 | |
| 1428. |
Which of the following can be used for the direct measurement of volumetric flow rate of slurry? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Rotameter |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 1429. |
When a fluid flows over a solid surface, the |
| A. | Velocity is uniform at any cross-section |
| B. | Velocity gradient is zero at the solid surface |
| C. | Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves |
| D. | Velocity is not zero at the solid surface |
| Answer» C. Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves | |
| 1430. |
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 | |
| 1431. |
The pressure head of a flow meter remains constant for |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Rotameter |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 1432. |
The ratio of maximum to average velocity in case of streamline flow between parallel plates is |
| A. | 1 |
| B. | 1.5 |
| C. | 2 |
| D. | 2.5 |
| Answer» C. 2 | |
| 1433. |
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'? |
| A. | At the centre |
| B. | At d/4 from the wall |
| C. | At the wall |
| D. | At d/8 from the wall |
| Answer» D. At d/8 from the wall | |
| 1434. |
Turbulent flow generally occurs for cases involving |
| A. | Highly viscous fluid |
| B. | Very narrow passages |
| C. | Very slow motion |
| D. | None of these |
| Answer» E. | |
| 1435. |
For laminar flow through a closed conduit |
| A. | Vmax = 2Vav |
| B. | Vmax = Vav |
| C. | Vmax = 1.5Vav |
| D. | Vmax = 0.5Vav |
| Answer» B. Vmax = Vav | |
| 1436. |
Which of the following is used for very accurate measurement of flow of gas at low velocity? |
| A. | Pitot tube |
| B. | Rotameter |
| C. | Segmental orificemeter |
| D. | Hot wire annemometer |
| Answer» E. | |
| 1437. |
The Mach number for hypersonic flow of compressible fluid is |
| A. | 1 |
| B. | > 1 |
| C. | > 4 |
| D. | < 2 |
| Answer» D. < 2 | |
| 1438. |
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 | |
| 1439. |
The resistance wire used in a hot wire anemometer for conducting electrical current is made of |
| A. | Copper |
| B. | Tungsten |
| C. | Chromium |
| D. | Aluminium |
| Answer» C. Chromium | |
| 1440. |
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 | |
| 1441. |
For steady ideal fluid flow, the Bernoulli's equation states that the |
| A. | Velocity is constant along a stream line |
| B. | Energy is constant throughout the fluid |
| C. | Energy is constant along a stream line, but may vary across stream lines |
| D. | None of these |
| Answer» D. None of these | |
| 1442. |
Bernoulli's equation accounts for the |
| A. | Various momentums |
| B. | Various masses |
| C. | Different forms of mechanical energy |
| D. | None of these |
| Answer» D. None of these | |
| 1443. |
Small pressure differences in liquids is measured using a/an |
| A. | U-tube manometer |
| B. | Inclined tube manometer |
| C. | Pitot tube |
| D. | None of these |
| Answer» C. Pitot tube | |
| 1444. |
Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid. |
| A. | 2 to 3 |
| B. | 0.01 to 0.10 |
| C. | 200 to 300 |
| D. | 100 to 1000 |
| Answer» B. 0.01 to 0.10 | |
| 1445. |
Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively). |
| 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⁻¹T⁻¹ | |
| 1446. |
__________ isused for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline. |
| A. | Venturimeter |
| B. | Pressure gauge |
| C. | Pitot tube |
| D. | Orificemeter |
| Answer» D. Orificemeter | |
| 1447. |
In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency. |
| A. | Manometric |
| B. | Mechanical |
| C. | Volumetric |
| D. | Overall |
| Answer» B. Mechanical | |
| 1448. |
Select the correct practical example of steady non-uniform flow. |
| 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 | |
| 1449. |
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. | 40° and 140° |
| B. | 45° and 60° |
| C. | 90° and 80° |
| D. | 20° and 120° |
| Answer» B. 45° and 60° | |
| 1450. |
In fluid flow, the boundary layer separation can not occur |
| A. | In case of boundaries experiencing form drag |
| B. | At points of abrupt changes in the flow directions |
| C. | In laminar flow |
| D. | None of these |
| Answer» E. | |