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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.
| 1251. |
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | double |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» E. | |
| 1252. |
A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest. |
| A. | equal to. |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» D. None of these | |
| 1253. |
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch) |
| A. | Cd 2g x H |
| B. | Cd 2g x H3/2 |
| C. | Cd 2g x H2 |
| D. | Cd 2g x H5/2 |
| Answer» E. | |
| 1254. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid) |
| A. | wH |
| B. | wH/2 |
| C. | wH2/2 |
| D. | wH2/3 |
| Answer» D. wH2/3 | |
| 1255. |
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by |
| A. | l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²) |
| B. | l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³) |
| C. | l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴) |
| D. | l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵) |
| Answer» E. | |
| 1256. |
An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch. |
| A. | 1% |
| B. | 1.5% |
| C. | 2% |
| D. | 2.5% |
| Answer» E. | |
| 1257. |
The weight per unit volume of a liquid at a standard temperature and pressure is called |
| A. | specific weight |
| B. | mass density |
| C. | specific gravity |
| D. | none of these |
| Answer» B. mass density | |
| 1258. |
The centre of buoyancy is the centre of area of the immersed body. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1259. |
The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement. |
| A. | The bodies A and B have equal stability |
| B. | The body A is more stable than body B |
| C. | The body B is more stable than body A |
| D. | The bodies A and B are unstable |
| Answer» D. The bodies A and B are unstable | |
| 1260. |
In open channels, the specific energy is the |
| A. | total energy per unit discharge |
| B. | total energy measured with respect to the datum passing through the bottom of the channel |
| C. | total energy measured above the horizontal datum |
| D. | kinetic energy plotted above the free surface of water |
| Answer» C. total energy measured above the horizontal datum | |
| 1261. |
The force per unit length is the unit of |
| A. | surface tension |
| B. | compressibility |
| C. | capillarity |
| D. | viscosity |
| Answer» B. compressibility | |
| 1262. |
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is |
| A. | μ π³ N² R² /1800 t |
| B. | μ π³ N² R⁴ /1800 t |
| C. | μ π³ N² R² /3600 t |
| D. | μ π³ N² R⁴ /3600 t |
| Answer» C. μ π³ N² R² /3600 t | |
| 1263. |
The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel. |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» E. | |
| 1264. |
A fluid which obeys the Newton's law of viscosity is termed as |
| A. | real fluid |
| B. | ideal fluid |
| C. | newtonian fluid |
| D. | non-newtonian fluid |
| Answer» D. non-newtonian fluid | |
| 1265. |
In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1266. |
A flow is called sub-sonic, if the Mach number is |
| A. | less than unity |
| B. | unity |
| C. | between 1 and 6 |
| D. | more than 6 |
| Answer» B. unity | |
| 1267. |
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called |
| A. | Newton's law of motion |
| B. | Newton's law of cooling |
| C. | Newton's law of viscosity |
| D. | Newton's law of resistance |
| Answer» E. | |
| 1268. |
The product of mass and accelaration of flowing liquid is called |
| A. | inertia force |
| B. | viscous force |
| C. | gravity force |
| D. | pressure force |
| Answer» B. viscous force | |
| 1269. |
The total head of a liquid particle in motion is equal to |
| A. | pressure head + kinetic head + potential head |
| B. | pressure head - (kinetic head + potential head) |
| C. | potential head - (pressure head + kinetic head) |
| D. | kinetic head - (pressure head + potential head) |
| Answer» B. pressure head - (kinetic head + potential head) | |
| 1270. |
The mass per unit volume of a liquid at a standard temperature and pressure is called |
| A. | specific weight |
| B. | mass density |
| C. | specific gravity |
| D. | none of these |
| Answer» C. specific gravity | |
| 1271. |
The viscosity of water at 20°C is |
| A. | one stoke |
| B. | one centistroke |
| C. | one poise |
| D. | one centipoise |
| Answer» E. | |
| 1272. |
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures. |
| A. | sum |
| B. | difference |
| C. | arithmatic mean |
| D. | geometric mean |
| Answer» C. arithmatic mean | |
| 1273. |
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel. |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» D. 0.95 times | |
| 1274. |
The top of the weir over which the water flows is known as |
| A. | sill or crest |
| B. | nappe or vein |
| C. | orifice |
| D. | none of these |
| Answer» B. nappe or vein | |
| 1275. |
When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure |
| A. | varies as the square of the radial distance |
| B. | increases linearly as its radial distance |
| C. | increases as the square of the radial distance |
| D. | decreases as the square of the radial distance |
| Answer» B. increases linearly as its radial distance | |
| 1276. |
The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece. |
| A. | less than |
| B. | more than |
| C. | Can't say |
| D. | None of these |
| Answer» B. more than | |
| 1277. |
The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1278. |
The coefficient of discharge for an external mouthpiece is |
| A. | 0.375 |
| B. | 0.5 |
| C. | 0.707 |
| D. | 0.855 |
| Answer» E. | |
| 1279. |
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be |
| A. | (2A√H₁)/(Cd × a√2g) |
| B. | (2AH₁)/(Cd × a√2g) |
| C. | (2AH₁3/2)/(Cd × a√2g) |
| D. | (2AH₁²)/(Cd × a√2g) |
| Answer» B. (2AH₁)/(Cd × a√2g) | |
| 1280. |
A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow. |
| A. | incompressible |
| B. | compressible |
| C. | Can't say |
| D. | None of these |
| Answer» B. compressible | |
| 1281. |
A siphon is used to connect two reservoirs at different levels intervened by a high ridge. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1282. |
A structure whose width is __________ the width of the channel, is called a flumed structure. |
| A. | less than |
| B. | more than |
| C. | Can't say |
| D. | None of these |
| Answer» B. more than | |
| 1283. |
The maximum efficiency of transmission through a pipe is |
| A. | 50% |
| B. | 56.7% |
| C. | 66.67% |
| D. | 76.66% |
| Answer» D. 76.66% | |
| 1284. |
The pressure less than atmospheric pressure is known as |
| A. | suction pressure |
| B. | vacuum pressure |
| C. | negative gauge pressure |
| D. | all of these |
| Answer» E. | |
| 1285. |
The total energy line lies over the hydraulic gradient line by an amount equal to the |
| A. | pressure head |
| B. | velocity head |
| C. | pressure head + velocity head |
| D. | pressure head - velocity head |
| Answer» C. pressure head + velocity head | |
| 1286. |
Which of the following is an example of laminar flow? |
| A. | Under ground flow |
| B. | Flow past tiny bodies |
| C. | Flow of oil in measuring instruments |
| D. | all of these |
| Answer» E. | |
| 1287. |
Coefficient of contraction is the ratio of |
| A. | actual velocity of jet at vena contracta to the theoretical velocity |
| B. | loss of head in the orifice to the head of water available at the exit of the orifice |
| C. | actual discharge through an orifice to the theoretical discharge |
| D. | area of jet at vena contracta to the area of orifice |
| Answer» E. | |
| 1288. |
In a free 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» B. the pressure below the nappe is negative | |
| 1289. |
When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1290. |
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy 's coefficient of friction for pipe, and l = Length of pipe ) |
| A. | d = (D⁵/8fl)1/2 |
| B. | d = (D⁵/8fl)1/3 |
| C. | d = (D⁵/8fl)1/4 |
| D. | d = (D⁵/8fl)1/5 |
| Answer» D. d = (D⁵/8fl)1/5 | |
| 1291. |
Coefficient of resistance is the ratio of |
| A. | actual velocity of jet at vena contracta to the theoretical velocity |
| B. | area of jet at vena contracta to the area of orifice |
| C. | loss of head in the orifice to the head of water available at the exit of the orifice |
| D. | actual discharge through an orifice to the dieoretical discharge |
| Answer» D. actual discharge through an orifice to the dieoretical discharge | |
| 1292. |
The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge) |
| A. | Q = Cd x b2g(H2 - H1) |
| B. | Q = Cd x b2g(H21/2 - H11/2) |
| C. | Q = (2/3) Cd × b × √(2g) × (H23/2 - H13/2) |
| D. | Q = Cd x b2g(H22 - H12) |
| Answer» D. Q = Cd x b2g(H22 - H12) | |
| 1293. |
According to equation of continuity, |
| A. | w1a1 = w2a2 |
| B. | w1v1 = w2v2 |
| C. | a1v1 = a2v2 |
| D. | a1/v1 = a2/v2 |
| Answer» D. a1/v1 = a2/v2 | |
| 1294. |
Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure. |
| A. | plus |
| B. | minus |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1295. |
A differential manometer is used to measure |
| A. | atmospheric pressure |
| B. | pressure in pipes and channels |
| C. | pressure in venturimeter |
| D. | difference of pressures between two points in a pipe |
| Answer» E. | |
| 1296. |
The value of coefficient of discharge is __________ the value of coefficient of velocity. |
| A. | less than |
| B. | same as |
| C. | more than |
| D. | None of these |
| Answer» B. same as | |
| 1297. |
The difference between the notch and weir is that the notch is of bigger size and the weir is of a smaller size. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1298. |
The Reynold's number of a ship is __________ to its velocity and length. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | Can't say |
| D. | None of these |
| Answer» B. inversely proportional | |
| 1299. |
The depth of centre of pressure lor an immersed surface inclined at an angle θ with the liquid surface lies at a distance equal to __________ the centre of gravity. |
| A. | below |
| B. | above |
| C. | below |
| D. | above |
| Answer» E. | |
| 1300. |
The specific gravity has no units. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |