MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of |
| A. | igh initial and maintenance cost |
| B. | ower discharge |
| C. | ower speed of operation |
| D. | ecessity of air vessel |
| Answer» B. ower discharge | |
| 252. |
Multistage centrifugal pumps are used to |
| A. | ive high discharge |
| B. | roduce high heads |
| C. | ump viscous fluids |
| D. | ll of these |
| Answer» C. ump viscous fluids | |
| 253. |
Euler's equation in the differential form for the motion of liquids is given by |
| A. | p/ρ + g.dz + v.dv = 0 |
| B. | p/ρ - g.dz + v.dv = 0 |
| C. | .dp + g.dz + v.dv = 0 |
| D. | .dp - g.dz + v.dv = 0 |
| Answer» B. p/ρ - g.dz + v.dv = 0 | |
| 254. |
Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as |
| A. | ift |
| B. | rag |
| C. | tagnation pressure |
| D. | ulk modulus |
| Answer» C. tagnation pressure | |
| 255. |
The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe) |
| A. | ²/2g |
| B. | .5v²/2g |
| C. | .375v²/2g |
| D. | .75v²/2g |
| Answer» C. .375v²/2g | |
| 256. |
Total pressure on a 1m x 1m gate immersed vertically at a depth of 2 m below the free water surface will be |
| A. | 000 kg |
| B. | 000 kg |
| C. | 000 kg |
| D. | 000 kg |
| Answer» B. 000 kg | |
| 257. |
An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice. |
| A. | ree |
| B. | artially |
| C. | ull |
| D. | one of these |
| Answer» D. one of these | |
| 258. |
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice. |
| A. | ess than twice |
| B. | ore than twice |
| C. | ess than three times |
| D. | ore than three times |
| Answer» D. ore than three times | |
| 259. |
The torque required to overcome viscous resistance of a collar bearing is(where R1 and R2 = External and internal radius of collar) |
| A. | μπ²N/60t) × (R₁ - R₂) |
| B. | μπ²N/60t) × (R₁² - R₂²) |
| C. | π²N/60t) × (R₁³ - R₂³) |
| D. | μπ²N/60t) × (R₁⁴ - R₂⁴) |
| Answer» E. | |
| 260. |
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge |
| A. | ame quantity of liquid |
| B. | .75 Q |
| C. | /0.75 |
| D. | .5 Q |
| Answer» B. .75 Q | |
| 261. |
The divergent portion of a Venturimeter is made longer than convergent portion in order to |
| A. | void the tendency of breaking away the stream of liquid |
| B. | o minimize frictional losses |
| C. | oth (A) and (B) |
| D. | one of these |
| Answer» D. one of these | |
| 262. |
Reynold's number is the ratio of the inertia force to the |
| A. | urface tension force |
| B. | iscous force |
| C. | ravity force |
| D. | lastic force |
| Answer» C. ravity force | |
| 263. |
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be |
| A. | orizontal |
| B. | early horizontal |
| C. | teep |
| D. | irst rise and then fall |
| Answer» C. teep | |
| 264. |
When the Mach number is between __________ the flow is called super-sonic flow. |
| A. | and 2.5 |
| B. | .5 and 4 |
| C. | and 6 |
| D. | and 6 |
| Answer» E. | |
| 265. |
The Newton's law of resistance is based on the assumption that the |
| A. | lanes of the body are completely smooth |
| B. | pace around the body is completely filled with the fluid |
| C. | luid particles do not exert any influence on one another |
| D. | ll of the above |
| Answer» E. | |
| 266. |
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is |
| A. | .417 H5/2 |
| B. | .417 H5/2 |
| C. | .171 H5/2 |
| D. | .141 H5/2 |
| Answer» C. .171 H5/2 | |
| 267. |
The meatcentric height is the distance between the |
| A. | entre of gravity of the floating body and the centre of buoyancy |
| B. | entre of gravity of the floating body and the metacentre |
| C. | etacentre and centre of buoyancy |
| D. | riginal centre of buoyancy and new centre of buoyancy |
| Answer» C. etacentre and centre of buoyancy | |
| 268. |
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta) |
| A. | gH |
| B. | × √(2g) |
| C. | g × √H |
| D. | (2gh) |
| Answer» E. | |
| 269. |
The ratio of the inertia force to the viscous force is called |
| A. | eynold's number |
| B. | roude's number |
| C. | eber's number |
| D. | uler's number |
| Answer» B. roude's number | |
| 270. |
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies |
| A. | irectly as fan speed |
| B. | quare of fan speed |
| C. | ube of fan speed |
| D. | quare root of fan speed |
| Answer» B. quare of fan speed | |
| 271. |
The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as |
| A. | ne dimensional flow |
| B. | niform flow |
| C. | teady flow |
| D. | urbulent flow |
| Answer» E. | |
| 272. |
The discharge over a rectangular notch is |
| A. | nversely proportional to H3/2 |
| B. | irectly proportional to H3/2 |
| C. | nversely proportional to H5/2 |
| D. | irectly proportional to H5/2 |
| Answer» C. nversely proportional to H5/2 | |
| 273. |
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is |
| A. | .89 kN |
| B. | .29 kN |
| C. | .28 kN |
| D. | 8.9 kN |
| Answer» C. .28 kN | |
| 274. |
The force per unit length is the unit of |
| A. | urface tension |
| B. | ompressibility |
| C. | apillarity |
| D. | iscosity |
| Answer» B. ompressibility | |
| 275. |
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of |
| A. | 9.2% |
| B. | 9.2% |
| C. | 8.8% |
| D. | 4.8% |
| Answer» E. | |
| 276. |
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of |
| A. | 9.2% |
| B. | 9.2% |
| C. | 8.8% |
| D. | 4.8% |
| Answer» B. 9.2% | |
| 277. |
The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is |
| A. | 00 kg/m3 |
| B. | 00 kg/m3 |
| C. | 00 kg/m3 |
| D. | 00 kg/m3 |
| Answer» E. | |
| 278. |
The hydraulic mean depth or the hydraulic radius is the ratio of |
| A. | rea of flow and wetted perimeter |
| B. | etted perimeter and diameter of pipe |
| C. | elocity of flow and area of flow |
| D. | one of these |
| Answer» B. etted perimeter and diameter of pipe | |
| 279. |
Differential manometer is used to measure |
| A. | ressure in pipes, channels etc. |
| B. | tmospheric pressure |
| C. | ery low pressure |
| D. | ifference of pressure between two points |
| Answer» E. | |
| 280. |
The loss of pressure head in case of laminar flow is proportional to |
| A. | elocity |
| B. | Velocity)2 |
| C. | Velocity)3 |
| D. | Velocity)4 |
| Answer» B. Velocity)2 | |
| 281. |
A differential manometer is used to measure |
| A. | tmospheric pressure |
| B. | ressure in pipes and channels |
| C. | ressure in Venturimeter |
| D. | ifference of pressures between two points in a pipe |
| Answer» E. | |
| 282. |
A point, in a compressible flow where the velocity of fluid is zero, is called |
| A. | ritical point |
| B. | ena contracta |
| C. | tagnation point |
| D. | one of these |
| Answer» D. one of these | |
| 283. |
The critical depth meter is used to measure |
| A. | elocity of flow in an open channel |
| B. | epth of flow in an open channel |
| C. | ydraulic jump |
| D. | epth of channel |
| Answer» D. epth of channel | |
| 284. |
A fluid which obeys the Newton's law of viscosity is termed as |
| A. | eal fluid |
| B. | deal fluid |
| C. | ewtonian fluid |
| D. | on-Newtonian fluid |
| Answer» D. on-Newtonian fluid | |
| 285. |
In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock) |
| A. | /sinα |
| B. | p/sinα |
| C. | /2sinα |
| D. | p/sin (α/2) |
| Answer» D. p/sin (α/2) | |
| 286. |
Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure. |
| A. | lus |
| B. | inus |
| C. | ivide |
| D. | ultiply |
| Answer» C. ivide | |
| 287. |
A turbine develops 10000 kW under a head of 25 meters at 135 r.p.m. Its specific speed is |
| A. | 75.4 r.p.m. |
| B. | 15.5 r.p.m. |
| C. | 41.5 r.p.m. |
| D. | 75.4 r.p.m |
| Answer» D. 75.4 r.p.m | |
| 288. |
Casting of a centrifugal pump is designed so as to minimize |
| A. | riction loss |
| B. | avitations |
| C. | tatic head |
| D. | oss of kinetic energy |
| Answer» E. | |
| 289. |
The absolute pressure is equal to |
| A. | auge pressure + atmospheric pressure |
| B. | auge pressure - atmospheric pressure |
| C. | tmospheric pressure - gauge pressure |
| D. | auge pressure - vacuum pressure |
| Answer» B. auge pressure - atmospheric pressure | |
| 290. |
A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is |
| A. | ,000 kg |
| B. | 3,500 kg |
| C. | 8,000 kg |
| D. | 7,000 kg |
| Answer» C. 8,000 kg | |
| 291. |
The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is%! |
| A. | (waV/2g) × sin θ |
| B. | (waV/g) × sin θ |
| C. | (waV²/2g) × sin 2θ |
| D. | (waV²/g) × sin θ |
| Answer» D. (waV¬¨‚â§/g) ‚àö√≥ sin ≈í‚àè | |
| 292. |
Maximum impulse will be developed in hydraulic ram when%! |
| A. | Waste valve closes suddenly |
| B. | Supply pipe is long |
| C. | Supply pipe is short |
| D. | Ram chamber is large |
| Answer» B. Supply pipe is long | |
| 293. |
For starting an axial flow pump, its delivery valve should be%! |
| A. | Closed |
| B. | Open |
| C. | Depends on starting condition and flow desired |
| D. | Could be either open or closed |
| Answer» C. Depends on starting condition and flow desired | |
| 294. |
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters)%! |
| A. | wQHs |
| B. | wQHd |
| C. | wQ (Hs - Hd) |
| D. | wQ (Hs + Hd) |
| Answer» E. | |
| 295. |
The pressure of fluid due to hammer blow is%! |
| A. | Directly proportional to density of fluid |
| B. | Inversely proportional to density of fluid |
| C. | Directly proportional to (density)1/2 of fluid |
| D. | Inversely proportional to (density)1/2 of fluid |
| Answer» D. Inversely proportional to (density)1/2 of fluid | |
| 296. |
The pressure of fluid due to hammer blow is%! |
| A. | Directly proportional to density of fluid |
| B. | Inversely proportional to density of fluid |
| C. | Directly proportional to (density)1/2 of fluid |
| D. | Inversely proportional to (density)1/2 of fluid |
| Answer» D. Inversely proportional to (density)1/2 of fluid | |
| 297. |
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.%! |
| A. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 298. |
Cavitation is caused by%! |
| A. | High velocity |
| B. | High pressure |
| C. | Weak material |
| D. | Low pressure |
| Answer» E. | |
| 299. |
The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)%! |
| A. | (H - hf )/H |
| B. | H/(H - hf ) |
| C. | (H + hf )/H |
| D. | H/(H + hf ) |
| Answer» B. H/(H - hf ) | |
| 300. |
Fluid is a substance which offers no resistance to change of%! |
| A. | Pressure |
| B. | Flow |
| C. | Shape |
| D. | Volume |
| Answer» D. Volume | |