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.
| 1451. |
All pipes of a particular nominal size have the same |
| A. | Inside diameter |
| B. | Outside diameter |
| C. | Thickness |
| D. | None of these |
| Answer» C. Thickness | |
| 1452. |
A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump |
| A. | Develops a lower head |
| B. | Capacity is reduced |
| C. | Requires more power |
| D. | All of the above |
| Answer» E. | |
| 1453. |
Remote control valve is a __________ valve. |
| A. | Gate |
| B. | Butterfly |
| C. | Needle |
| D. | Globe |
| Answer» C. Needle | |
| 1454. |
Multistage centrifugal pumps are generally used for |
| A. | High head |
| B. | Low head but high discharge |
| C. | Highly viscous liquid |
| D. | Slurries of high solid concentration |
| Answer» B. Low head but high discharge | |
| 1455. |
Potential flow is characterised by the |
| A. | Irrotational and frictionless flow |
| B. | Irrotational and frictional flow |
| C. | One in which dissipation of mechanical energy into heat occurs |
| D. | Formation of eddies within the stream |
| Answer» B. Irrotational and frictional flow | |
| 1456. |
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 new discharge will be __________ litres/minute. |
| A. | 500 |
| B. | 200 |
| C. | 1000 |
| D. | 750 |
| Answer» B. 200 | |
| 1457. |
For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter). |
| A. | 1/D |
| B. | 1/D² |
| C. | 1/D⁵ |
| D. | D² |
| Answer» D. D² | |
| 1458. |
The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) |
| A. | V² |
| B. | 1/V² |
| C. | 1/V |
| D. | V |
| Answer» B. 1/V² | |
| 1459. |
The simple pitot tube does not measure the |
| A. | Static pressure |
| B. | Dynamic pressure |
| C. | Velocity at the stagnation point |
| D. | All of the above |
| Answer» E. | |
| 1460. |
Critical velocity in a pipe flow |
| A. | Increases as fluid viscosity increases |
| B. | Increases as pipe diameter increases |
| C. | Independent of fluid density |
| D. | None of these |
| Answer» C. Independent of fluid density | |
| 1461. |
The Navier-Stokes equation deals with the law of conservation of |
| A. | Mass |
| B. | Energy |
| C. | Both A and B |
| D. | Momentum |
| Answer» E. | |
| 1462. |
The kinetic energy correction factor for velocity distribution of laminar flow is |
| A. | 0.5 |
| B. | 1.66 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 1463. |
The momentum correction factor for the velocity distribution of laminar flow is |
| A. | 1.3 |
| B. | 1.66 |
| C. | 2.5 |
| D. | None of these |
| Answer» E. | |
| 1464. |
Isotropic turbulence occurs |
| A. | Where there is no velocity gradient |
| B. | At higher temperatures |
| C. | Only in Newtonion fluids |
| D. | None of these |
| Answer» B. At higher temperatures | |
| 1465. |
Fluidised beds are formed, when the |
| A. | Fluid friction is zero |
| B. | Gravity force is less than the fluid friction |
| C. | Pressure forces equal gravity forces |
| D. | Sum of the fluid friction and pressure forces is equal and opposite to gravity forces |
| Answer» C. Pressure forces equal gravity forces | |
| 1466. |
Poise is converted into stoke by |
| A. | Multiplying with density (gm/c.c) |
| B. | Dividing by density (gm/c.c) |
| C. | Multiplying with specific gravity |
| D. | Dividing by specific gravity |
| Answer» C. Multiplying with specific gravity | |
| 1467. |
One poise (unit of absolute/dynamic viscosity) is equivalent to one |
| A. | Gm/cm². sec |
| B. | Gm/cm. sec |
| C. | Cm²/sec |
| D. | M²/sec |
| Answer» C. Cm²/sec | |
| 1468. |
Which is not a variable head meter? |
| A. | Venturimeter |
| B. | Pitot tube |
| C. | Rotameter |
| D. | None of these |
| Answer» D. None of these | |
| 1469. |
Capacity of a hydraulic accumulator is defined in terms of maximum |
| A. | Amount of energy stored |
| B. | Flow rate through accumulator |
| C. | Rate of falling of ram |
| D. | Volume available in the cylinder |
| Answer» B. Flow rate through accumulator | |
| 1470. |
For very low pressure and high discharge rate, the compressor used is a/an __________ compressor. |
| A. | Axial |
| B. | Reciprocating |
| C. | Rotary |
| D. | None of these |
| Answer» D. None of these | |
| 1471. |
Which of the following is a dimensionless parameter? |
| A. | Angular velocity |
| B. | Specific weight |
| C. | Kinematic viscosity |
| D. | None of these |
| Answer» E. | |
| 1472. |
When the pipe Reynold's number is 6000, the flow is generally |
| A. | Viscous |
| B. | Laminar |
| C. | Turbulent |
| D. | Transition |
| Answer» D. Transition | |
| 1473. |
A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp). |
| A. | Less head & capacity |
| B. | More head |
| C. | More capacity |
| D. | Less head & more capacity |
| Answer» B. More head | |
| 1474. |
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 of the above |
| Answer» D. All of the above | |
| 1475. |
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. | |
| 1476. |
In parallel pipe problems, the |
| A. | Head loss is the same through each pipe |
| B. | Discharge is the same through all the pipes |
| C. | Total head loss is equal to the sum of the head losses through each pipe |
| D. | None of these |
| Answer» B. Discharge is the same through all the pipes | |
| 1477. |
A stream tube is that, which has __________ cross-section entirely bounded by stream lines. |
| A. | A circular |
| B. | Any convenient |
| C. | A small |
| D. | A large |
| Answer» C. A small | |
| 1478. |
A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of __________ shape. |
| A. | Circular |
| B. | Rectangular |
| C. | Triangular |
| D. | Trapezoidal |
| Answer» B. Rectangular | |
| 1479. |
A rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and rotameter shows the same reading, the flow rate (cc/sec) is |
| A. | 26 |
| B. | 42 |
| C. | 269 |
| D. | 325 |
| Answer» D. 325 | |
| 1480. |
For a given fluid flow rate, which of the following incurs maximum head loss? |
| A. | Orifice meter |
| B. | Venturimeter |
| C. | Flow nozzle |
| D. | All of the above |
| Answer» B. Venturimeter | |
| 1481. |
Which of the following flow measuring devices is an area meter? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Anemometer |
| D. | Rotameter |
| Answer» E. | |
| 1482. |
Which of the following is the most common pump for pumping either raw sewage or sludge? |
| A. | Electromagnetic pump |
| B. | Centrifugal pump |
| C. | Reciprocating pump |
| D. | Gear pump |
| Answer» D. Gear pump | |
| 1483. |
The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct) |
| A. | x |
| B. | πx |
| C. | 2x |
| D. | x/2 |
| Answer» B. πx | |
| 1484. |
Pressure drag does not depend upon the |
| A. | Roughness of surface of the body |
| B. | Pressure of main flow only |
| C. | Length of the body in flow direction |
| D. | All of the above |
| Answer» E. | |
| 1485. |
While starting an axial flow pump, its delivery valve should be kept |
| A. | Open |
| B. | Closed |
| C. | Either open or closed |
| D. | None of these |
| Answer» B. Closed | |
| 1486. |
While starting a centrifugal pump, its delivery valve should be kept |
| A. | Opened |
| B. | Closed |
| C. | Either opened or closed ; it does not make any difference |
| D. | Either opened or closed; depending on the fluid viscosity |
| Answer» C. Either opened or closed ; it does not make any difference | |
| 1487. |
In continuous fluidisation |
| A. | Solids are completely entrained |
| B. | The pressure drop is less than that for batch fluidisation |
| C. | There is no entrainment of solids |
| D. | Velocity of the fluid is very small |
| Answer» B. The pressure drop is less than that for batch fluidisation | |
| 1488. |
Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump? |
| A. | Increasing the impeller speed and the volute area |
| B. | Increasing the number of vanes in the impeller |
| C. | Mounting of two or more impellers in series on a single shaft |
| D. | Either of A, B or C |
| Answer» D. Either of A, B or C | |
| 1489. |
Speed of sound in an ideal gas depends on its |
| A. | Temperature |
| B. | Pressure |
| C. | Specific volume |
| D. | None of these |
| Answer» B. Pressure | |
| 1490. |
Air vessel provided in a reciprocating pump is for |
| A. | Increasing the acceleration head |
| B. | Making the friction in pipe uniform |
| C. | Decreasing the acceleration head |
| D. | None of these |
| Answer» C. Decreasing the acceleration head | |
| 1491. |
Water hammer in a pipeline results from the |
| A. | Bursting of pipelines due to closure by a valve |
| B. | Rapid pressure change due to a rapid change in the rate of flow |
| C. | Pressure increase due to closure of a valve resulting in decrease in rate of flow |
| D. | None of these |
| Answer» C. Pressure increase due to closure of a valve resulting in decrease in rate of flow | |
| 1492. |
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 | |
| 1493. |
In a free vortex, the |
| A. | Velocity changes linearly with radial distance |
| B. | Flow is necessarily rotational |
| C. | Radial component of velocity is same everywhere |
| D. | Stream lines are not circular |
| Answer» B. Flow is necessarily rotational | |
| 1494. |
In a fluidised bed reactor |
| A. | Temperature gradients are very high |
| B. | Temperature is more or less uniform |
| C. | Hot spots are formed |
| D. | Segregation of the solids occurs |
| Answer» C. Hot spots are formed | |
| 1495. |
With a constant diameter impeller of a centrifugal pump |
| A. | Its capacity varies directly as the square of speed |
| B. | Head varies as the square of speed |
| C. | Horsepower input varies as the square of speed |
| D. | Head varies as the speed |
| Answer» C. Horsepower input varies as the square of speed | |
| 1496. |
The dimension of surface tension is |
| A. | ML⁻² |
| B. | MT⁻² |
| C. | MLT⁻² |
| D. | ML⁻²T |
| Answer» C. MLT⁻² | |
| 1497. |
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 | |
| 1498. |
The time of oscillation of a floating body is |
| A. | Longer, if metacentric height is increased |
| B. | Independent of the metacentric height |
| C. | Dependent on the buoyant forces only |
| D. | None of these |
| Answer» E. | |
| 1499. |
Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm). |
| A. | H |
| B. | 12.6 H |
| C. | 13.6 H |
| D. | 14.6 H |
| Answer» C. 13.6 H | |
| 1500. |
For the manometer set up shown in the figure, the pressure difference PA - PB is given by |
| A. | (ρH - ρair)gH |
| B. | (ρH - ρL)gH |
| C. | (ρH - ρL) gH + (ρL - ρair) . g(L - H) |
| D. | (ρH - ρL) gL + (ρL - ρair)gH |
| Answer» B. (ρH - ρL)gH | |