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.
| 1351. |
In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1352. |
The discharge in an open channel corresponding to critical depth is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | None of these |
| Answer» D. None of these | |
| 1353. |
The pressure of a liquid measured with the help of a piezometer tube is |
| A. | vacuum pressure |
| B. | gauge pressure |
| C. | absolute pressure |
| D. | atmospheric pressure |
| Answer» C. absolute pressure | |
| 1354. |
The variation in the volume of a liquid with the variation of pressure is called its |
| A. | surface tension |
| B. | compressibility |
| C. | capillarity |
| D. | viscosity |
| Answer» C. capillarity | |
| 1355. |
The surface tension of mercury at normal temperature is __________ that of water. |
| A. | same as |
| B. | lower than |
| C. | higher than |
| D. | None of these |
| Answer» D. None of these | |
| 1356. |
The unit of surface tension is |
| A. | N/m |
| B. | N/m² |
| C. | N/m³ |
| D. | N-m |
| Answer» B. N/m² | |
| 1357. |
The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity. |
| A. | below |
| B. | above |
| C. | below |
| D. | above |
| Answer» E. | |
| 1358. |
When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of |
| A. | a triangle |
| B. | a paraboloid |
| C. | an ellipse |
| D. | none of these |
| Answer» C. an ellipse | |
| 1359. |
A flow is called super-sonic if the |
| A. | velocity of flow is very high |
| B. | discharge is difficult to measure |
| C. | Mach number is between 1and 6 |
| D. | none of these |
| Answer» D. none of these | |
| 1360. |
The absolute pressure is equal to |
| A. | gauge pressure + atmospheric pressure |
| B. | gauge pressure - atmospheric pressure |
| C. | atmospheric pressure - gauge pressure |
| D. | gauge pressure - vacuum pressure |
| Answer» B. gauge pressure - atmospheric pressure | |
| 1361. |
Reynold's number is the ratio of the inertia force to the |
| A. | surface tension force |
| B. | viscous force |
| C. | gravity force |
| D. | elastic force |
| Answer» C. gravity force | |
| 1362. |
The stability of a dam is checked for |
| A. | tension at the base |
| B. | overturning of the wall or dam |
| C. | sliding of the wall or dam |
| D. | all of these |
| Answer» E. | |
| 1363. |
The maximum discharge over a broad crested weir is |
| A. | 0.384 Cd x L x H1/2 |
| B. | 0.384 Cd x L x H3/2 |
| C. | 1.71 Cd x L x H1/2 |
| D. | 1.71 Cd x L x H3/2 |
| Answer» E. | |
| 1364. |
The total energy line lies over the centre line of the pipe by an amount equal to |
| A. | pressure head |
| B. | velocity head |
| C. | pressure head + velocity head |
| D. | pressure head - velocity head |
| Answer» D. pressure head - velocity head | |
| 1365. |
The liquid used in manometers should have |
| A. | low density |
| B. | high density |
| C. | low surface tension |
| D. | high surface tension |
| Answer» E. | |
| 1366. |
Euler's number is the ratio of __________ force to pressure force. |
| A. | inertia |
| B. | gravity |
| C. | viscous |
| D. | None of these |
| Answer» B. gravity | |
| 1367. |
The loss of pressure head in case of laminar flow is proportional to |
| A. | velocity |
| B. | (velocity)² |
| C. | (velocity)³ |
| D. | (velocity)⁴ |
| Answer» B. (velocity)² | |
| 1368. |
The velocity of flow is same at all points in the cross-section of a channel. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1369. |
The coefficient of discharge is the ratio of dieoretical discharge to the actual discharge through an orifice. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1370. |
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to |
| A. | half the depth |
| B. | half the breadth |
| C. | twice the depth |
| D. | twice the breadth |
| Answer» B. half the breadth | |
| 1371. |
The density of a liquid in kg/m³ is numerically equal to its specific gravity. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1372. |
The critical depth meter is used to measure |
| A. | velocity of flow in an open channel |
| B. | depth of flow in an open channel |
| C. | hydraulic jump |
| D. | depth of channel |
| Answer» D. depth of channel | |
| 1373. |
Froude's number is the ratio of inertia force to |
| A. | pressure force |
| B. | elastic force |
| C. | gravity force |
| D. | surface tension force |
| Answer» D. surface tension force | |
| 1374. |
The intensity of pressure on an immersed surface __________ with the increase in depth. |
| A. | does not change |
| B. | increases |
| C. | decreases |
| D. | None of these |
| Answer» C. decreases | |
| 1375. |
The tangential velocity of the water element having a free vortex is |
| A. | directly proportional to its distance from the centre |
| B. | inversely proportional to its distance from the centre |
| C. | directly proportional to its (distance)2 from the centre |
| D. | inversely proportional to its (distance)2 from the centre |
| Answer» C. directly proportional to its (distance)2 from the centre | |
| 1376. |
The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as |
| A. | path line |
| B. | stream line |
| C. | steak line |
| D. | potential line |
| Answer» C. steak line | |
| 1377. |
A channel is said to be of most economical cross-section, if |
| A. | it gives maximum discharge for a given cross-sectional area and bed slope |
| B. | it has minimum wetted perimeter |
| C. | it involves lesser excavation for the designed amount of discharge |
| D. | all of the above |
| Answer» E. | |
| 1378. |
The energy equation, given by following equation, where (E = internal energy/mass), is applicable to |
| A. | perfect gases only. |
| B. | isothermal flow of gases. |
| C. | adiabatic unsteady flow of gases. |
| D. | all compressible fluids. |
| Answer» E. | |
| 1379. |
What is the ratio of fluid carrying capacity of two pipes having diameters d₁ and d₂ respectively ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 1380. |
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. | 1:√3:2 |
| B. | 1:2:3 |
| C. | 1:2:2 |
| D. | 1:√2:√2 |
| Answer» D. 1:√2:√2 | |
| 1381. |
Which of the following is the 'Blaussius equation', relating friction factor to the Reynolds number ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1382. |
One litre of water occupies a volume of |
| A. | 100 cm³ |
| B. | 250 cm³ |
| C. | 500 cm³ |
| D. | 1000 cm³ |
| Answer» E. | |
| 1383. |
In one dimensional flow, the flow |
| A. | is steady and uniform |
| B. | takes place in straight line |
| C. | takes place in curve |
| D. | takes place in one direction |
| Answer» C. takes place in curve | |
| 1384. |
The kinematic viscosity is the |
| A. | ratio of absolute viscosity to the density of the liquid |
| B. | ratio of density of the liquid to the absolute viscosity |
| C. | product of absolute viscosity and density of the liquid |
| D. | product of absolute viscosity and mass of the liquid |
| Answer» B. ratio of density of the liquid to the absolute viscosity | |
| 1385. |
In a depressed nappe |
| A. | the pressure below the nappe is atmospheric |
| B. | the pressure below the nappe is negative |
| C. | the pressure above the nappe is atmospheric |
| D. | the pressure above the nappe is negative |
| Answer» C. the pressure above the nappe is atmospheric | |
| 1386. |
The value of bulk modulus of a fluid is required to determine |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Mach number |
| D. | Euler's number |
| Answer» D. Euler's number | |
| 1387. |
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) | |
| 1388. |
Nature of fluid flow during the opening of a valve in a pipeline is |
| A. | Laminar |
| B. | Unsteady |
| C. | Steady |
| D. | Uniform |
| Answer» C. Steady | |
| 1389. |
If Blausius or Darcey friction factor is 'f₁' then the Fanning friction factor is equal to |
| A. | f₁/4 |
| B. | 4F₂ |
| C. | 2f₁ |
| D. | f₁/2 |
| Answer» B. 4F₂ | |
| 1390. |
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 | |
| 1391. |
The losses in open channel flow generally vary as the |
| A. | Inverse of the roughness |
| B. | First power of the roughness |
| C. | Square of the velocity |
| D. | Inverse square of hydraulic radius |
| Answer» C. Square of the velocity | |
| 1392. |
The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids |
| A. | Having high viscosities |
| B. | Moving at low velocities |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1393. |
What is the speed of sound (m/sec) in ordinary water? |
| A. | 1500 |
| B. | 330 |
| C. | 1000 |
| D. | 3000 |
| Answer» B. 330 | |
| 1394. |
In the complete turbulence zone (in rough pipes), the |
| A. | Rough and smooth pipes have the same friction factor |
| B. | Laminar film covers the roughness projections |
| C. | Friction factor depends upon NRe only |
| D. | Friction factor is independent of the relative roughness |
| Answer» E. | |
| 1395. |
Discharge in laminar flow through a pipe varies |
| A. | As the square of the radius |
| B. | Inversely as the pressure drop |
| C. | Inversely as the viscosity |
| D. | As the square of the diameter |
| Answer» B. Inversely as the pressure drop | |
| 1396. |
N. second/m² is |
| A. | The S.I. unit of dynamic viscosity |
| B. | The S.I. unit of kinematic viscosity |
| C. | Equivalent to one poise |
| D. | Equivalent to one stoke |
| Answer» B. The S.I. unit of kinematic viscosity | |
| 1397. |
In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller. |
| A. | Speed of |
| B. | Diameter of |
| C. | Fluid velocity leaving |
| D. | All of the above |
| Answer» E. | |
| 1398. |
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. | |
| 1399. |
Foot valves provided in pumps are __________ valves. |
| A. | Relief |
| B. | Three/four way |
| C. | Pressure reducing |
| D. | Directional control |
| Answer» E. | |
| 1400. |
Flow measurement in an open channel is done by a/an |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Weir |
| D. | Rotameter |
| Answer» D. Rotameter | |