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.
| 201. |
A thick liquid like syrup has a __________ viscosity than a light liquid like water. |
| A. | esser |
| B. | reater |
| C. | ame |
| D. | one of these |
| Answer» C. ame | |
| 202. |
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by |
| A. | esigning new impeller |
| B. | rimming the impeller size to the required size by machining |
| C. | ot possible |
| D. | ome other alterations in the impeller |
| Answer» C. ot possible | |
| 203. |
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s) |
| A. | × Q × H |
| B. | × Q × hf |
| C. | × Q (H - hf) |
| D. | × Q (H + hf) |
| Answer» D. × Q (H + hf) | |
| 204. |
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury? |
| A. | 0.5 |
| B. | 0.4 |
| C. | 0.515 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 205. |
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by |
| A. | V/(vr - v) |
| B. | V/(vr + v) |
| C. | /(vr - v) |
| D. | /(vr + v) |
| Answer» C. /(vr - v) | |
| 206. |
The velocity of the liquid flowing through the divergent portion of a Venturimeter |
| A. | emains constant |
| B. | ncreases |
| C. | ecreases |
| D. | epends upon mass of liquid |
| Answer» D. epends upon mass of liquid | |
| 207. |
The pressure of the liquid flowing through the divergent portion of a Venturimeter |
| A. | emains constant |
| B. | ncreases |
| C. | ecreases |
| D. | epends upon mass of liquid |
| Answer» D. epends upon mass of liquid | |
| 208. |
The velocity corresponding to Reynold number of 2000 is called |
| A. | ub-sonic velocity |
| B. | uper-sonic velocity |
| C. | ower critical velocity |
| D. | igher critical velocity |
| Answer» D. igher critical velocity | |
| 209. |
Euler's number is the ratio of __________ force to pressure force. |
| A. | nertia |
| B. | ravity |
| C. | iscous |
| D. | one of these |
| Answer» B. ravity | |
| 210. |
The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as |
| A. | ath line |
| B. | tream line |
| C. | teak line |
| D. | otential line |
| Answer» C. teak line | |
| 211. |
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be |
| A. | /16 to 1/8 |
| B. | /8 to 1/4 |
| C. | /4 to 1/3 |
| D. | /3 to 1/2 |
| Answer» E. | |
| 212. |
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) | |
| 213. |
According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed) |
| A. | × √(m × i) |
| B. | × √(m × i) |
| C. | C × √(m × i) |
| D. | i × √(A × C) |
| Answer» D. i × √(A × C) | |
| 214. |
The specific speed of a turbine is given by the equation |
| A. | √P / H3/2 |
| B. | √P / H² |
| C. | √P / H5/4 |
| D. | √P / H3 |
| Answer» D. √P / H3 | |
| 215. |
The total energy line lies over the centre line of the pipe by an amount equal to |
| A. | ressure head |
| B. | elocity head |
| C. | ressure head + velocity head |
| D. | ressure head - velocity head |
| Answer» D. ressure head - velocity head | |
| 216. |
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than |
| A. | rictional force |
| B. | iscosity |
| C. | urface friction |
| D. | ll of the above |
| Answer» E. | |
| 217. |
The most efficient section of a channel is |
| A. | riangular |
| B. | ectangular |
| C. | quare |
| D. | rapezoidal |
| Answer» E. | |
| 218. |
The discharge through a channel of trapezoidal section is maximum when |
| A. | idth of channel at the top is equal to twice the width at the bottom |
| B. | epth of channel is equal to the width at the bottom |
| C. | he sloping side is equal to half the width at the top |
| D. | he sloping side is equal to the width at the bottom |
| Answer» D. he sloping side is equal to the width at the bottom | |
| 219. |
The efficiency of a Pelton wheel working under constant head ________ with the increase in power. |
| A. | emain same |
| B. | ncreases |
| C. | ecreases |
| D. | one of these |
| Answer» C. ecreases | |
| 220. |
The intensity of pressure on an immersed surface __________ with the increase in depth. |
| A. | oes not change |
| B. | ncreases |
| C. | ecreases |
| D. | one of these |
| Answer» C. ecreases | |
| 221. |
A hydraulic accumulator is a device used to store _________ energy which may be supplied to a machine later on. |
| A. | train |
| B. | ressure |
| C. | inetic |
| D. | one of these |
| Answer» C. inetic | |
| 222. |
The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is |
| A. | /√2 |
| B. | /2 |
| C. | |
| Answer» C. | |
| 223. |
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant) |
| A. | × M × m1/2 × i2/3 |
| B. | × M × m2/3 × i1/2 |
| C. | 1/2 × M2/3 × m × i |
| D. | 2/3 × M1/3 × m × i |
| Answer» C. 1/2 × M2/3 × m × i | |
| 224. |
A Piezometer tube is used only for measuring |
| A. | ow pressure |
| B. | igh pressure |
| C. | oderate pressure |
| D. | acuum pressure |
| Answer» D. acuum pressure | |
| 225. |
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem? |
| A. | enturimeter |
| B. | rifice plate |
| C. | ozzle |
| D. | ll of the above |
| Answer» E. | |
| 226. |
According to Bernoulli's equation |
| A. | + p/w + v²/2g = constant |
| B. | + p/w - v²/2g = constant |
| C. | - p/w + v²/2g = constant |
| D. | - p/w - v²/2g = constant |
| Answer» B. + p/w - v²/2g = constant | |
| 227. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by |
| A. | Q/Q = (1/2) × (dH/H) |
| B. | Q/Q = (3/4) × (dH/H) |
| C. | Q/Q = (dH/H) |
| D. | Q/Q = (3/2) × (dH/H) |
| Answer» E. | |
| 228. |
A flow through an expanding tube at constant rate is called |
| A. | teady uniform flow |
| B. | teady non-uniform flow |
| C. | nsteady uniform flow |
| D. | nsteady non-uniform flow |
| Answer» C. nsteady uniform flow | |
| 229. |
An average value of coefficient of velocity is |
| A. | 0.62 |
| B. | 0.76 |
| C. | 0.84 |
| D. | 0.97 |
| Answer» E. | |
| 230. |
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance) |
| A. | c × Cv |
| B. | c × Cr |
| C. | v × Cr |
| D. | c/Cr |
| Answer» B. c × Cr | |
| 231. |
Delivery head of a centrifugal pump is |
| A. | irectly proportional to N |
| B. | nversely proportional to N |
| C. | irectly proportional to N² |
| D. | nversely proportional to N² |
| Answer» D. nversely proportional to N² | |
| 232. |
The total head of a liquid particle in motion is equal to |
| A. | ressure head + kinetic head + potential head |
| B. | ressure head - (kinetic head + potential head) |
| C. | otential head - (pressure head + kinetic head) |
| D. | inetic head - (pressure head + potential head) |
| Answer» B. ressure head - (kinetic head + potential head) | |
| 233. |
The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head. |
| A. | ne-half |
| B. | ne-third |
| C. | wo-third |
| D. | one of these |
| Answer» C. wo-third | |
| 234. |
A fluid having no viscosity is known as |
| A. | eal fluid |
| B. | deal fluid |
| C. | ewtonian fluid |
| D. | on-Newtonian fluid |
| Answer» C. ewtonian fluid | |
| 235. |
In reaction turbine, draft tube is used |
| A. | o transport water downstream without eddies |
| B. | o convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section |
| C. | or safety of turbine |
| D. | o increase flow rate |
| Answer» C. or safety of turbine | |
| 236. |
The speed ratio in case of Francis turbine varies from |
| A. | .15 to 0.3 |
| B. | .4 to 0.5 |
| C. | .6 to 0.9 |
| D. | to 1.5 |
| Answer» D. to 1.5 | |
| 237. |
The power developed by a turbine is (where H = Head of water under which the turbine is working) |
| A. | irectly proportional to H1/2 |
| B. | nversely proportional to H1/2 |
| C. | irectly proportional to H3/2 |
| D. | nversely proportional to H3/2 |
| Answer» D. nversely proportional to H3/2 | |
| 238. |
The Thomson's turbine is _________ reaction turbine. |
| A. | n axial flow |
| B. | n inward flow |
| C. | n outward flow |
| D. | mixed flow |
| Answer» C. n outward flow | |
| 239. |
Multistage centrifugal pumps are used to obtain |
| A. | igh discharge |
| B. | igh head |
| C. | umping of viscous fluids |
| D. | igh head and high discharge |
| Answer» C. umping of viscous fluids | |
| 240. |
The height of a water column equivalent to a pressure of 0.15 MPa is |
| A. | 5.3 m |
| B. | 5.3 m |
| C. | 5.3 m |
| D. | 5.3 m |
| Answer» B. 5.3 m | |
| 241. |
The pressure at a point 4 m below the free surface of water is |
| A. | 9.24 kPa |
| B. | 9.24 kPa |
| C. | 9.24 kPa |
| D. | 9.24 kPa |
| Answer» D. 9.24 kPa | |
| 242. |
The flow in a pipe is turbulent when Reynold number is |
| A. | ess than 2000 |
| B. | etween 2000 and 2800 |
| C. | ore than 2800 |
| D. | one of these |
| Answer» D. one of these | |
| 243. |
The flow in a pipe is neither laminar nor turbulent when Reynold number is |
| A. | ess than 2000 |
| B. | etween 2000 and 2800 |
| C. | ore than 2800 |
| D. | one of these |
| Answer» C. ore than 2800 | |
| 244. |
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the |
| A. | ressure head |
| B. | elocity head |
| C. | ressure head + velocity head |
| D. | ressure head - velocity head |
| Answer» B. elocity head | |
| 245. |
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel) |
| A. | q/g)1/2 |
| B. | q²/g)1/3 |
| C. | q³/g)1/4 |
| D. | q⁴/g)1/5 |
| Answer» C. q³/g)1/4 | |
| 246. |
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is |
| A. | π³ N² R² /1800 t |
| B. | π³ N² R⁴ /1800 t |
| C. | π³ N² R² /3600 t |
| D. | π³ N² R⁴ /3600 t |
| Answer» C. π³ N² R² /3600 t | |
| 247. |
One poise is equal to |
| A. | .1 N-s/m2 |
| B. | N-s/m2 |
| C. | 0 N-s/m2 |
| D. | 00 N-s/m2 |
| Answer» B. N-s/m2 | |
| 248. |
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called |
| A. | eir |
| B. | otch |
| C. | rifice |
| D. | one of these |
| Answer» C. rifice | |
| 249. |
For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred |
| A. | entrifugal |
| B. | xial flow |
| C. | eciprocating |
| D. | ixed flow |
| Answer» C. eciprocating | |
| 250. |
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is |
| A. | 9.2% |
| B. | 8.8% |
| C. | 4.8% |
| D. | 8.4% |
| Answer» B. 8.8% | |