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.
| 1301. |
A flow is called sonic, if the Mach number is unity. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1302. |
The hydraulic gradient line is always parallel to the centre line of the pipe. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1303. |
If the value of coefficient of discharge increases, the discharge through the orifice decreases. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1304. |
The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1305. |
Falling drops of water become spheres due to the property of |
| A. | surface tension of water |
| B. | compressibility of water |
| C. | capillarity of water |
| D. | viscosity of water |
| Answer» B. compressibility of water | |
| 1306. |
The coefficient of venturifiume, generally, lies between |
| A. | 0.3 to 0.45 |
| B. | 0.50 to 0.75 |
| C. | 0.75 to 0.95 |
| D. | 0.95 to 1.0 |
| Answer» E. | |
| 1307. |
The pressure of the liquid flowing through the divergent portion of a venturimeter |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | depends upon mass of liquid |
| Answer» D. depends upon mass of liquid | |
| 1308. |
When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1309. |
When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1310. |
The coefficient of viscosity may be determined by |
| A. | capillary tube method |
| B. | orifice type viscometer |
| C. | rotating cylinder method |
| D. | all of these |
| Answer» E. | |
| 1311. |
An ideal fluid is frictionless and incompressible. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1312. |
Venturimeter is used to |
| A. | measure the velocity of a flowing liquid |
| B. | measure the pressure of a flowing liquid |
| C. | measure the discharge of liquid flowing in a pipe |
| D. | measure the pressure difference of liquid flowing between two points in a pipe line |
| Answer» D. measure the pressure difference of liquid flowing between two points in a pipe line | |
| 1313. |
A manometer is used to measure |
| A. | low pressure |
| B. | moderate pressure |
| C. | high pressure |
| D. | atomospheric pressure |
| Answer» D. atomospheric pressure | |
| 1314. |
The centre of gravity of the volume of the liquid displaced is called |
| A. | centre of pressure |
| B. | centre of buoyancy |
| C. | metacentre |
| D. | none of these |
| Answer» C. metacentre | |
| 1315. |
A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is |
| A. | 3.53 kN |
| B. | 33.3 kN |
| C. | 35.3 kN |
| D. | none of these |
| Answer» D. none of these | |
| 1316. |
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. | μπ²N/60t) × (R₁³ - R₂³) |
| D. | (μπ²N/60t) × (R₁⁴ - R₂⁴) |
| Answer» E. | |
| 1317. |
The hammer blow in pipes occurs when |
| A. | there is excessive leakage in the pipe |
| B. | the pipe bursts under high pressure of fluid |
| C. | the flow of fluid through the pipe is suddenly brought to rest by closing of the valve |
| D. | the flow of fluid through the pipe is gradually brought to rest by closing of the valve |
| Answer» D. the flow of fluid through the pipe is gradually brought to rest by closing of the valve | |
| 1318. |
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity) |
| A. | tan θ = a/g |
| B. | tan θ = 2 a/g |
| C. | tan θ = a/2g |
| D. | tan θ = a2/2g |
| Answer» B. tan θ = 2 a/g | |
| 1319. |
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» D. None of these | |
| 1320. |
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice) |
| A. | Q = Cd x a x 2gh |
| B. | Q = (2/3). Cd × a × h |
| C. | Q = (Cd × a)/√(2gh) |
| D. | Q = (3Cd × a)/√(2h) |
| Answer» B. Q = (2/3). Cd × a × h | |
| 1321. |
A flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called turbulent flow. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1322. |
The power transmitted through the pipe is maximum when the head lost due to friction is equal to |
| A. | one-fourth of the total supply head |
| B. | one-third of the total supply head |
| C. | one-half of the total supply head |
| D. | two-third of the total supply head |
| Answer» C. one-half of the total supply head | |
| 1323. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is |
| A. | (v₁ - v₂)²/g |
| B. | (v₁² - v₂²)/g |
| C. | (v₁ - v₂)²/2g |
| D. | (v₁² - v₂²)/2g |
| Answer» D. (v₁² - v₂²)/2g | |
| 1324. |
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to |
| A. | 1/2 depth |
| B. | 1/2 breadth |
| C. | 1/2 sloping side |
| D. | 1/4 (depth + breadth) |
| Answer» B. 1/2 breadth | |
| 1325. |
In a venturimeter, the velocity of liquid at throat is __________ than at inlet. |
| A. | higher |
| B. | lower |
| C. | Can't say |
| D. | None of these |
| Answer» B. lower | |
| 1326. |
The total pressure on an immersed surface inclined at an angle θ with the liquid surface is |
| A. | wA |
| B. | wx |
| C. | wAx |
| D. | wAx/sin θ |
| Answer» D. wAx/sin θ | |
| 1327. |
In case of flow through parallel pipes, |
| A. | the head loss for all the pipes is same |
| B. | the total discharge is equal to the sum of discharges in the various pipes |
| C. | the total head loss is the sum of head losses in the various pipes |
| D. | Both a and b |
| Answer» E. | |
| 1328. |
The pressure at a point 4 m below the free surface of water is |
| A. | 19.24 kPa |
| B. | 29.24 kPa |
| C. | 39.24 kPa |
| D. | 49.24 kPa |
| Answer» D. 49.24 kPa | |
| 1329. |
The ratio of the inertia force to the viscous force is called |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Euler's number |
| Answer» B. Froude's number | |
| 1330. |
The pressure measured with the help of a piezometer tube is in |
| A. | N/mm² |
| B. | N/m² |
| C. | head of liquid |
| D. | all of these |
| Answer» D. all of these | |
| 1331. |
Barometer is used to measure |
| A. | velocity of liquid |
| B. | atmospheric pressure |
| C. | pressure in pipes and channels |
| D. | difference of pressure between two points in a pipe |
| Answer» C. pressure in pipes and channels | |
| 1332. |
The power transmitted through a pipe is (where w = Specific weight in N/m³, and Q = Discharge in m³/s) |
| A. | w x Q x H |
| B. | w x Q x hf |
| C. | w x Q (H - hf) |
| D. | w x Q (H + hf) |
| Answer» D. w x Q (H + hf) | |
| 1333. |
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta. |
| A. | less than |
| B. | more than |
| C. | Can't say |
| D. | None of these |
| Answer» B. more than | |
| 1334. |
The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» C. more than | |
| 1335. |
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in |
| A. | neutral equilibrium |
| B. | stable equilibrium |
| C. | unstable equilibrium |
| D. | none of these |
| Answer» C. unstable equilibrium | |
| 1336. |
A flow through a long pipe at constant rate is called |
| A. | steady uniform flow |
| B. | steady non-uniform flow |
| C. | unsteady uniform flow |
| D. | unsteady non-uniform flow |
| Answer» B. steady non-uniform flow | |
| 1337. |
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number) |
| A. | 1/RN |
| B. | 4/RN |
| C. | 16/RN |
| D. | 64/RN |
| Answer» D. 64/RN | |
| 1338. |
The discharge through a siphon spillway is |
| A. | Cd x a2gH |
| B. | Cd x a2g x H3/2 |
| C. | Cd x a2g x H2 |
| D. | Cd x a2g x H5/2 |
| Answer» B. Cd x a2g x H3/2 | |
| 1339. |
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch) |
| A. | Cd x b2gH |
| B. | Cd x b2g x H |
| C. | Cd x b2g x H3/2 |
| D. | Cd x b2g x H2 |
| Answer» D. Cd x b2g x H2 | |
| 1340. |
The pressure measured with the help of a pressure gauge is called |
| A. | atmospheric pressure |
| B. | gauge pressure |
| C. | absolute pressure |
| D. | mean pressure |
| Answer» C. absolute pressure | |
| 1341. |
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is |
| A. | ω.r/2g |
| B. | ω².r²/2g |
| C. | ω.r/4g |
| D. | ω².r²/4g |
| Answer» C. ω.r/4g | |
| 1342. |
The Bernoulli's equation is based on the assumption that |
| A. | there is no loss of energy of the liquid flowing |
| B. | the velocity of flow is uniform across any cross-section of the pipe |
| C. | no force except gravity acts on the fluid |
| D. | all of the above |
| Answer» E. | |
| 1343. |
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium. |
| A. | neutral |
| B. | stable |
| C. | unstable |
| D. | None of these |
| Answer» B. stable | |
| 1344. |
A weir is usually made of masonry or concrete. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1345. |
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice. |
| A. | less than twice |
| B. | more than twice |
| C. | less than three times |
| D. | more than three times |
| Answer» D. more than three times | |
| 1346. |
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, at right angles to the direction of flow of the liquid is known as lift. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1347. |
In order to measure the flow with a venturimeter, it is installed in |
| A. | horizontal line |
| B. | inclined line with flow upwards |
| C. | inclined line with flow downwards |
| D. | any direction and in any location |
| Answer» E. | |
| 1348. |
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if |
| A. | length of both the pipes is same |
| B. | diameter of both the pipes is same |
| C. | loss of head and discharge of both the pipes is same |
| D. | loss of head and velocity of flow in both the pipes is same |
| Answer» D. loss of head and velocity of flow in both the pipes is same | |
| 1349. |
One cubic metre of water weighs |
| A. | 100 litres |
| B. | 250 litres |
| C. | 500 litres |
| D. | 1000 litres |
| Answer» E. | |
| 1350. |
The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |