MCQOPTIONS
Saved Bookmarks
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.
| 201. |
Multi-stage centrifugal pump are used to |
| A. | give high discharge |
| B. | produce high heads |
| C. | pump viscous fluids |
| D. | all of these |
| Answer» C. pump viscous fluids | |
| 202. |
The ratio of quantity off liquid discharged per second from the pump to the quantity of liquidpassing per second through the impeller is known as |
| A. | manometric efficiency |
| B. | mechanical efficiency |
| C. | overall efficiency |
| D. | volumetric efficiency |
| Answer» E. | |
| 203. |
14 Discharge of centrifugal pump is |
| A. | directly proportional to diameter of its impeller |
| B. | inversely proportional to diameter of its impeller |
| C. | directly proportional to (diameter)2 of its impeller |
| D. | inversely proportional to (diameter)2 of its impeller |
| Answer» D. inversely proportional to (diameter)2 of its impeller | |
| 204. |
During delivery stroke of a reciprocating pump, the separation may take placeP |
| A. | ge 5 of 7a) at the end of the suction stroke |
| B. | in the middle of the suction stroke |
| C. | in the beginning of the suction stroke |
| D. | non off the above |
| Answer» B. in the middle of the suction stroke | |
| 205. |
During suction stroke of a reciprocating pump, the separation may take place |
| A. | at the end of the suction stroke |
| B. | in the middle of the suction stroke |
| C. | in the beginning of the suction stroke |
| D. | non off the above |
| Answer» D. non off the above | |
| 206. |
Air vessel in reciprocating pump is used |
| A. | to obtain continuous supply of water at uniform rate |
| B. | to reduce suction head |
| C. | to increase the delivery head |
| D. | none of the above |
| Answer» B. to reduce suction head | |
| 207. |
Cavitation can take place in case of |
| A. | pelton wheel |
| B. | francis turbine |
| C. | reciprocating pump |
| D. | centrifugal pump |
| Answer» C. reciprocating pump | |
| 208. |
Cavitation will take place if the pressure of the flowing fluid at any point isP |
| A. | ge 4 of 7a) more than vapor pressure of the fluid |
| B. | equal to vapor pressure of the fluid |
| C. | is less than vapor pressure of the fluid |
| D. | none of the above |
| Answer» D. none of the above | |
| 209. |
The specific speed (Ns) of aa pump is given by thee expression |
| A. | ns= [n√q]/[hm5/4] |
| B. | ns= [n√p]/[hm3/4] |
| C. | ns= [n√q]/[hm3/4] |
| D. | ns= [n√p]/[hm5/4] |
| Answer» D. ns= [n√p]/[hm5/4] | |
| 210. |
Specific speed of a pump is the speed at which a pump runs when |
| A. | head developed is unity and discharge is one cubic meter |
| B. | head developed is unity and shat horse power is also unity |
| C. | discharge is one cubic meter and shaft horse power is unity |
| D. | none of the above |
| Answer» B. head developed is unity and shat horse power is also unity | |
| 211. |
To discharge a large quantity of liquid by multi-stage centrifugal pump, the impellers are connected |
| A. | in parallel |
| B. | in series |
| C. | in parallel and in series both |
| D. | none of the above |
| Answer» B. in series | |
| 212. |
To produce a high head by multistage centrifugal pumps, the impellers are connected…P |
| A. | ge 3 of 7a) in parallel |
| B. | in series |
| C. | in parallel and in series both |
| D. | none of the above |
| Answer» C. in parallel and in series both | |
| 213. |
Mechanical efficiency (ηmech) of a centrifugal pump is given by |
| A. | (power at the impeller)/ s.h.p. |
| B. | s.h.p/ power at the impeller |
| C. | power possessed by water/ power at the impeller |
| D. | power possessed by water/ s.h.p |
| Answer» B. s.h.p/ power at the impeller | |
| 214. |
The manometric efficiency (ηman) of a centrifugal pump is given by |
| A. | hm/gvw2u2 |
| B. | ghm/vw2u2 |
| C. | vw2u2/ghm |
| D. | gvw2u2/hm |
| Answer» C. vw2u2/ghm | |
| 215. |
The manometric head Hm of a centrifugal pump is given by |
| A. | pressure head at the outlet of the pump – pressure head at the inlet |
| B. | total head at inlet – total head at outlet |
| C. | total head at outlet - total head at inlet |
| D. | none of the above |
| Answer» D. none of the above | |
| 216. |
The work done by centrifugal pump on water per second per unit weight of water is given by |
| A. | 1/g[vw1u1] |
| B. | 1/g[vw2u2] |
| C. | 1/g[vw2u2-vw1u1] |
| D. | none of the above |
| Answer» C. 1/g[vw2u2-vw1u1] | |
| 217. |
For a series o curved radial vanes, the work done per second per unit weight is equal to |
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» D. none of the above | |
| 218. |
Efficiency off the jet of the water having velocity V & Striking a series of vertical plates moving witha velocity u, is maximum when |
| A. | 1/g (vw1u1 + vw2u2) |
| B. | 1/g[v1u1+v2u2] |
| C. | 1/g[vw1u1??vw2u2.] |
| D. | none of the above |
| Answer» E. | |
| 219. |
Efficiency of the jet of the water having velocity V & Striking a series if vertical plates moving with a velocity u is given by, |
| A. | [2v(v-u)]/u2 |
| B. | [2u(v-u)]/v2 |
| C. | u2/[v2(v-u)] |
| D. | none of the above. |
| Answer» C. u2/[v2(v-u)] | |
| 220. |
The force exerted by jet of the water having velocity V on a series of vertical plate moving with avelocity u is given by, |
| A. | fx= ??av2. |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??avu. |
| D. | none of the above. |
| Answer» B. fx = ??a(v-u) 2 | |
| 221. |
The force exerted by jet of the water having velocity V on a vertical plate moving with a velocity u isgiven by |
| A. | fx = ??a(v-u) 2sin2?? |
| B. | fx = ??a(v-u) 2 |
| C. | fx = ??a(v-u) 2 [1+cos??] |
| D. | none of the above |
| Answer» C. fx = ??a(v-u) 2 [1+cos??] | |
| 222. |
The force exerted by jet of the water on stationary curved plate in the direction of the jet is given by |
| A. | fx = ??av2sin2?? |
| B. | fx = ??av2(1+cos??) |
| C. | fx = ??av2 |
| D. | fx = ??av2 (1+sin??) |
| Answer» C. fx = ??av2 | |
| 223. |
The force exerted by jet of the water on stationary inclined plate in the direction of the jet is given by |
| A. | fx= ??av2 |
| B. | fx= ??av2sin2?? |
| C. | fx= ??av2 (1+cos??) |
| D. | fx= ??av2 (1+sin??) |
| Answer» C. fx= ??av2 (1+cos??) | |
| 224. |
The force exerted by jet of the water on stationary vertical plate in the direction of the jet is given by |
| A. | fx= ??av2sin2?? |
| B. | fx= ??av2(1+cos??) |
| C. | fx= ??av2 |
| D. | none of the above |
| Answer» D. none of the above | |
| 225. |
calculate the frictional slope of a triangular channel having depth 2.5m and side slope of 1H:2V.If the rate of change of specific energy is 1.6 x10-5m/s, If V= 1.57 m/s. |
| A. | 5.53 x10-4m |
| B. | 6.53 x10-4m |
| C. | 7.53 x10-4m |
| D. | 8.53 x10-4m |
| Answer» D. 8.53 x10-4m | |
| 226. |
Calculate the bed slope of the channel if the slop of the energy line is 0.00024 and the length ofbackwater curve is 104166.67m. If E1-E2= 3m. |
| A. | 2.28x 10-5 |
| B. | 3.28 x10-5 |
| C. | 4.28 x10-5 |
| D. | 5.28 x10-5 |
| Answer» E. | |
| 227. |
Determine the length of backwater curve if E1=2.8m, E2=5.6m, S0=0.00009, Sf= 0.00004. |
| A. | 26000m |
| B. | 36000m |
| C. | 46000m |
| D. | 56000m |
| Answer» E. | |
| 228. |
When gravitational force is equal to the friction drag, what type of depth is formed?P |
| A. | ge 9 of 11a) critical depth |
| B. | normal depth |
| C. | cylindrical depth |
| D. | conical depth |
| Answer» C. cylindrical depth | |
| 229. |
If the difference between specific energies is 2m, calculate the rate of change of specificenergies if the length of backwater curve is 26314 m. |
| A. | 6.6x10-5m |
| B. | 7.6 x10-5m |
| C. | 8.6 x10-5m |
| D. | 9.6 x10-5m |
| Answer» C. 8.6 x10-5m | |
| 230. |
Calculate the value of Froud’s number if the ratio of rate of change of specific energy and rate ofchange of depth is 0.9. |
| A. | 0.29 |
| B. | 0.30 |
| C. | 0.31 |
| D. | 0.32 |
| Answer» D. 0.32 | |
| 231. |
What happens to depth of flow when there is obstruction in path |
| A. | remains same |
| B. | increases |
| C. | decreases |
| D. | flow stops |
| Answer» C. decreases | |
| 232. |
Which of the following assumptions are true in case of GVF? |
| A. | flow is not steady |
| B. | stream lines are parallel |
| C. | pressure distribution is not hydrostatic |
| D. | channel has varying alignment and shape |
| Answer» C. pressure distribution is not hydrostatic | |
| 233. |
When S0 greater than 0 and Yn less than Yc it is called as |
| A. | adverse |
| B. | horizontal |
| C. | critical |
| D. | steep |
| Answer» E. | |
| 234. |
A slope based on the culvert bottom is called---- |
| A. | hydraulic slope |
| B. | hydraulic curve |
| C. | adverse slope |
| D. | horizontal slope |
| Answer» B. hydraulic curve | |
| 235. |
When Yn is greater than Yc and So greater than 0, it is called as ---- |
| A. | adverse |
| B. | horizontal |
| C. | critical |
| D. | mild |
| Answer» E. | |
| 236. |
Specific energy in GVF changes only under which of the following conditions: |
| A. | difference between bed slope and slope of the energy line |
| B. | both bed slope and energy slope are equal |
| C. | presence of bed slope alone |
| D. | presence of energy slope alone |
| Answer» B. both bed slope and energy slope are equal | |
| 237. |
Hydraulic radius for wide rectangular channel section is--- |
| A. | 3y |
| B. | 2y |
| C. | y |
| D. | y/2 |
| Answer» D. y/2 | |
| 238. |
When S0 is equal to zero, it is called ----- |
| A. | adverse slope |
| B. | horizontal slope |
| C. | critical slope |
| D. | mild slope |
| Answer» C. critical slope | |
| 239. |
Calculate the value of Sf for trapezoidal channel having depth 2m, width 5m and side slope of1H:1.5V. Given: dy/dx= 1.18x10-3, S0= 1 in 1000, C= 50. |
| A. | 0.00001 |
| B. | 0.00002 |
| C. | 0.00003 |
| D. | 0.00004 |
| Answer» B. 0.00002 | |
| 240. |
Calculate the value of rate of change of specific energy for a triangular channel having depth3.5m and the side slope is 1H:2V. Given: V=2.5m/s, dy/dx= 8.6x10-4 |
| A. | 3.74x10-4m |
| B. | 4.47 x10-4m |
| C. | 5.47 x10-4m |
| D. | 6.47 x10-4m |
| Answer» D. 6.47 x10-4m | |
| 241. |
ationSelect the correct answer using the codes given below: |
| A. | 1,2 and 3 |
| B. | 1 and 3 only |
| C. | 1 and 2 only |
| D. | 2 and 3 only |
| Answer» B. 1 and 3 only | |
| 242. |
If E = specific energy at a section in a gradually varied flow, then (dE/dx) = |
| A. | s0+sf |
| B. | s0-sf |
| C. | sf-s0 |
| D. | sfs0-1 |
| Answer» C. sf-s0 | |
| 243. |
The differential equation of the gradually varied flow can be written by using Manning’s Formulafor the case off a wide rectangular channel as (dy/dx) = |
| A. | s0{[1-(yn/y)3.33]/[1-(yn/y)3]} |
| B. | s0{[1-(yc/y)3.33]/[1-(yc/y)3]} |
| C. | s0{[1-(yn/y)3]/[1-(yn/y)3]} |
| D. | s0{[1-(yo/yc)3]/[1-(yn/y)3.33]} |
| Answer» B. s0{[1-(yc/y)3.33]/[1-(yc/y)3]} | |
| 244. |
Which of the following turbine is preferred 0 to 25m head of water?P |
| A. | ge 4 of 11a) pelton wheel |
| B. | kaplan turbine |
| C. | francis turbine |
| D. | none of the above |
| Answer» C. francis turbine | |
| 245. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as_____________ efficiency. |
| A. | hydraulic |
| B. | mechanical |
| C. | overall |
| D. | none of the above |
| Answer» C. overall | |
| 246. |
The Unit speed is the speed of a turbine when it is working |
| A. | under unit head and develops unit power |
| B. | under unit head and discharge one m3/sec |
| C. | under unit head |
| D. | none of the above |
| Answer» D. none of the above | |
| 247. |
Specific speed of the turbine is defined as the speed at which the turbine runs when |
| A. | working under unit head and discharging one liter per second |
| B. | working under unit head and develops unit horse power |
| C. | develops unit horse power and discharges one liter per second |
| D. | none of the above |
| Answer» C. develops unit horse power and discharges one liter per second | |
| 248. |
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency(ηo) is |
| A. | ??h= ??o x ??m |
| B. | ??o= ??h x ??m |
| C. | ??o= ??m/??h |
| D. | none off the above |
| Answer» C. ??o= ??m/??h | |
| 249. |
The overall efficiency of the turbine is the ratio of |
| A. | power at the inlet of the turbine to the power at the shaft |
| B. | power at the shaft to the power given to the runner |
| C. | power at the shaft to the power at the inlet of turbine |
| D. | none of the above |
| Answer» D. none of the above | |
| 250. |
Mechanical efficiency of a turbine is the ratio of |
| A. | power at the inlet to the power at the shaft of turbine |
| B. | power at the shaft to the power given to the runner |
| C. | power at the shaft to the power at the inlet of turbine |
| D. | none of the above |
| Answer» C. power at the shaft to the power at the inlet of turbine | |