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.
| 1201. |
The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1202. |
The total energy of a liquid particle in motion is equal to |
| A. | pressure energy + kinetic energy + potential energy |
| B. | pressure energy - (kinetic energy + potential energy) |
| C. | potential energy - (pressure energy + kinetic energy |
| D. | kinetic energy - (pressure energy + potential energy) |
| Answer» B. pressure energy - (kinetic energy + potential energy) | |
| 1203. |
The vacuum pressure is always the negative gauge pressure. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1204. |
The discharge through a channel of trapezoidal section is maximum when |
| A. | width of channel at the top is equal to twice the width at the bottom |
| B. | depth of channel is equal to the width at the bottom |
| C. | the sloping side is equal to half the width at the top |
| D. | the sloping side is equal to the width at the bottom |
| Answer» D. the sloping side is equal to the width at the bottom | |
| 1205. |
A flow in which __________ force is dominating over the viscosity is called turbulent flow. |
| A. | elastic |
| B. | surface tension |
| C. | viscous |
| D. | inertia |
| Answer» E. | |
| 1206. |
The discharge over a triangular notch is |
| A. | inversely proportional to H3/2 |
| B. | directly proportional to H3/2 |
| C. | inversely proportional to H5/2 |
| D. | directly proportional to H5/2 |
| Answer» E. | |
| 1207. |
The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called |
| A. | surface tension |
| B. | compressibility |
| C. | capillarity |
| D. | viscosity |
| Answer» E. | |
| 1208. |
The centre of pressure acts __________ the centre of gravity of immersed surface. |
| A. | at |
| B. | above |
| C. | below |
| D. | None of these |
| Answer» D. None of these | |
| 1209. |
Coefficient of velocity is defined as 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. | actual discharge through an orifice to the theoretical discharge |
| D. | none of the above |
| Answer» B. area of jet at vena contracta to the area of orifice | |
| 1210. |
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the |
| A. | pressure head |
| B. | velocity head |
| C. | pressure head + velocity head |
| D. | pressure head - velocity head |
| Answer» B. velocity head | |
| 1211. |
A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called |
| A. | Pascal's law |
| B. | Archimede's principle |
| C. | D-Alembert's principle |
| D. | none of these |
| Answer» D. none of these | |
| 1212. |
The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch. |
| A. | plus |
| B. | minus |
| C. | Can't say |
| D. | None of these |
| Answer» B. minus | |
| 1213. |
Water is a __________ fluid. |
| A. | real |
| B. | ideal |
| C. | newtonian |
| D. | non-newtonian |
| Answer» D. non-newtonian | |
| 1214. |
The force present in a moving liquid is |
| A. | inertia force |
| B. | viscous force |
| C. | gravity force |
| D. | all of these |
| Answer» E. | |
| 1215. |
A flow whose streamline is represented by a curve, is called |
| A. | one-dimensional flow |
| B. | two-dimensional flow |
| C. | three-dimensional flow |
| D. | four-dimensional flow |
| Answer» C. three-dimensional flow | |
| 1216. |
The specific gravity of an oil whose specific weight is 7.85 kN/m³, is |
| A. | 0.8 |
| B. | 1 |
| C. | 1.2 |
| D. | 1.6 |
| Answer» B. 1 | |
| 1217. |
The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface) |
| A. | (IG/Ax̅) - x̅ |
| B. | (IG/x̅) - Ax̅ |
| C. | (Ax̅/IG) + x̅ |
| D. | (IG/Ax̅) + x̅ |
| Answer» E. | |
| 1218. |
The pressure of liquid at throat in a venturimeter is __________ than that at inlet. |
| A. | higher |
| B. | lower |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1219. |
The viscosity of a liquid is due to cohesion of its particles. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1220. |
The ratio of the inertia force to the gravity force is called Froude number. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1221. |
When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid |
| A. | remains horizontal |
| B. | becomes curved |
| C. | falls on the front end |
| D. | falls on the back end |
| Answer» D. falls on the back end | |
| 1222. |
In a venturiflume, the flow takes place at |
| A. | atmospheric pressure |
| B. | gauge pressure |
| C. | absolute pressure |
| D. | none of these |
| Answer» B. gauge pressure | |
| 1223. |
A pitot tube is used to measure the |
| A. | velocity of flow at the required point in a pipe |
| B. | pressure difference between two points in a pipe |
| C. | total pressure of liquid flowing in a pipe |
| D. | discharge through a pipe |
| Answer» B. pressure difference between two points in a pipe | |
| 1224. |
If the depth of water in an open channel is less than the critical depth, the flow is called |
| A. | critical flow |
| B. | turbulent flow |
| C. | tranquil flow |
| D. | torrential flow |
| Answer» E. | |
| 1225. |
The property of a liquid which enables it to resist tensile stress is called its surface tension. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 1226. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by |
| A. | dQ/Q = 3/2 × (dH/H) |
| B. | dQ/Q = 2 × (dH/H) |
| C. | dQ/Q = 5/2 × (dH/H) |
| D. | dQ/Q = 3 × (dH/H) |
| Answer» D. dQ/Q = 3 × (dH/H) | |
| 1227. |
Bulk modulus of a fluid is the ratio of |
| A. | shear stress to shear strain |
| B. | increase in volume to the viscosity of fluid |
| C. | increase in pressure to the volumetric strain |
| D. | critical velocity to the viscosity of fluid |
| Answer» D. critical velocity to the viscosity of fluid | |
| 1228. |
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe. |
| A. | less than |
| B. | more than |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1229. |
The length of the divergent cone in a venturimeter is __________ that of the convergent cone. |
| A. | equal to |
| B. | double |
| C. | three to four times |
| D. | five to six times |
| Answer» D. five to six times | |
| 1230. |
A flow is called hyper-sonic, if the Mach number is |
| A. | less than unity |
| B. | unity |
| C. | between 1 and 6 |
| D. | none of these |
| Answer» E. | |
| 1231. |
Newton's law of viscosity is a relationship between |
| A. | pressure, velocity and temperature |
| B. | shear stress and rate of shear strain |
| C. | shear stress and velocity |
| D. | rate of shear strain and temperature |
| Answer» C. shear stress and velocity | |
| 1232. |
The pressure of air __________ with the increase of height from the surface of the earth. |
| A. | does not change |
| B. | decreases |
| C. | increases |
| D. | None of these |
| Answer» C. increases | |
| 1233. |
The discharge through a channel of rectangular section will be maximum, if |
| A. | its depth is twice the breadth |
| B. | its breadth is twice the depth |
| C. | its depth is thrice the breadth |
| D. | its breadth is thrice the depth |
| Answer» C. its depth is thrice the breadth | |
| 1234. |
The velocity at which the laminar flow stops, is known as |
| A. | velocity of approach |
| B. | lower critical velocity |
| C. | higher critical velocity |
| D. | none of these |
| Answer» C. higher critical velocity | |
| 1235. |
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as |
| A. | narrow-crested weir |
| B. | broad-crested weir |
| C. | Ogee weir |
| D. | submerged weir |
| Answer» E. | |
| 1236. |
The loss of head at exit of a pipe is |
| A. | v²/2g |
| B. | 0.5v²/2g |
| C. | 0.375v²/2g |
| D. | 0.75v²/2g |
| Answer» B. 0.5v²/2g | |
| 1237. |
A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1238. |
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. | lift |
| B. | drag |
| C. | stagnation pressure |
| D. | bulk modulus |
| Answer» C. stagnation pressure | |
| 1239. |
A piezometer tube is used only for measuring |
| A. | low pressure |
| B. | high pressure |
| C. | moderate pressure |
| D. | vacuum pressure |
| Answer» D. vacuum pressure | |
| 1240. |
When an internal mouthpiece is running full, the discharge through the mouthpiece is twice the discharge when it is running free. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1241. |
Select the correct statement |
| A. | Weber's number is the ratio of inertia force to elastic force. |
| B. | Weber's number is the ratio of gravity force to surface tension force. |
| C. | Weber's number is the ratio of viscous force to pressure force. |
| D. | Weber's number is the ratio of inertia force to surface tension force. |
| Answer» E. | |
| 1242. |
The point at which the resultant pressure on an immersed surface acts, is known as |
| A. | centre of gravity |
| B. | centre of depth |
| C. | centre of pressure |
| D. | centre of immersed surface |
| Answer» D. centre of immersed surface | |
| 1243. |
When the Mach number is more than 6, the flow is called |
| A. | sub-sonic flow |
| B. | sonic flow |
| C. | super-sonic flow |
| D. | hyper-sonic flow |
| Answer» E. | |
| 1244. |
A venturiflume is a flumed structure constructed across a channel by restricting its width. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1245. |
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface) |
| A. | w.A |
| B. | wx |
| C. | wAx |
| D. | wA/x |
| Answer» D. wA/x | |
| 1246. |
The pressure intensity in kN/m² (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface) |
| A. | w |
| B. | wh |
| C. | w/h |
| D. | h/w |
| Answer» C. w/h | |
| 1247. |
The flow at critical depth in an open channel is called torrential flow. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1248. |
The flow in a pipe is turbulent when Reynold number is |
| A. | less than 2000 |
| B. | between 2000 and 2800 |
| C. | more than 2800 |
| D. | none of these |
| Answer» D. none of these | |
| 1249. |
The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is |
| A. | ρ ω² r2 |
| B. | 2ρ ω² r2 |
| C. | ρ ω² r2/2 |
| D. | ρ ω² r2/4 |
| Answer» D. ρ ω² r2/4 | |
| 1250. |
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |