McqMate
201. |
Which among the following does not depend on the friction factor? |
A. | pipe diameter |
B. | fluid density |
C. | viscosity |
D. | weight |
Answer» D. weight |
202. |
Darcy- Weisbach equation gives relation between |
A. | pressure and temperature |
B. | mass, volume and pressure |
C. | head loss and pressure loss |
D. | pressure loss only |
Answer» C. head loss and pressure loss |
203. |
Loss of head due to friction is |
A. | directly proportional to hydraulic radius |
B. | inversely proportional to velocity |
C. | inversely proportional to hydraulic radius |
D. | directly proportional to gravitational constant |
Answer» C. inversely proportional to hydraulic radius |
204. |
The formula for hydraulic diameter is |
A. | 4a/p |
B. | 4ap |
C. | 4av |
D. | 4v |
Answer» A. 4a/p |
205. |
Relative roughness is |
A. | ϵ/d |
B. | ϵ*d |
C. | ϵ/dm |
D. | ϵgd |
Answer» A. ϵ/d |
206. |
The liquid flowing through a series of pipes can take up |
A. | pipes of different diameters |
B. | pipes of the same diameters only. |
C. | single pipe only |
D. | short pipes only |
Answer» A. pipes of different diameters |
207. |
The total head loss for the system is equal to |
A. | pipe length |
B. | pipe diameter |
C. | width of the reservoir |
D. | height difference of reservoirs |
Answer» D. height difference of reservoirs |
208. |
Which among the following is not a loss that is developed in the pipe? |
A. | entry |
B. | exit |
C. | connection between two pipes |
D. | liquid velocity |
Answer» D. liquid velocity |
209. |
If the two reservoirs are kept at the same level, the head loss is |
A. | z1-z2 |
B. | zero |
C. | t2-t1 |
D. | s2-s1 |
Answer» B. zero |
210. |
The pipe diameter is |
A. | directly proportional to fluid density |
B. | directly proportional to mass flow rate |
C. | inversely proportional to mass flow rate |
D. | directly proportional to fluid velocity |
Answer» B. directly proportional to mass flow rate |
211. |
Coefficient of friction of a laminar flow is |
A. | re/16 |
B. | re/64 |
C. | 16/re |
D. | 64/re |
Answer» C. 16/re |
212. |
1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS |
A. | botanical science |
B. | zoological science |
C. | chemistry |
D. | physics |
Answer» C. chemistry |
213. |
Similitude is a concept applicable to the testing of |
A. | mathematical models |
B. | physical models |
C. | engineering models |
D. | chemical models |
Answer» C. engineering models |
214. |
A model of with same shape is |
A. | geometric similarity |
B. | kinematic similarity |
C. | dynamic similarity |
D. | conditional similarity |
Answer» A. geometric similarity |
215. |
All the parameters in a similitude are described using |
A. | continuum mechanics |
B. | solid mechanics |
C. | diesel mechanics |
D. | aircraft mechanics |
Answer» A. continuum mechanics |
216. |
The rate at which the particles of fluid can spread is called |
A. | surface tension |
B. | diffusivity |
C. | viscosity |
D. | kinetics |
Answer» B. diffusivity |
217. |
The Prandtl Number approximates |
A. | momentum diffusivity to thermal diffusivity |
B. | thermal diffusivity to momentum diffusivity |
C. | shear stress to thermal diffusivity |
D. | thermal diffusivity to kinematic viscosity |
Answer» A. momentum diffusivity to thermal diffusivity |
218. |
Which among the following is the standard symbol for Atwood number? |
A. | a |
B. | ar |
C. | ar |
D. | a |
Answer» A. a |
219. |
Fanning friction factor is |
A. | 0.25 times darcy friction factor |
B. | same as darcy friction factor |
C. | 2 times darcy friction factor |
D. | independent |
Answer» A. 0.25 times darcy friction factor |
220. |
Which among the following is the standard symbol for Froude number? |
A. | f |
B. | fo |
C. | fr |
D. | f |
Answer» C. fr |
221. |
Principle of fluid mechanics works on the utilization of |
A. | accelerating mass |
B. | volume |
C. | work |
D. | velocity |
Answer» C. work |
222. |
The force analysis on a curved vane is understood using |
A. | velocity triangles |
B. | angle of the plate |
C. | vane angles |
D. | plate dimensions |
Answer» A. velocity triangles |
223. |
Jet propulsion works on the principle of |
A. | newton’s first law |
B. | newton’s second law |
C. | newton’s third law |
D. | thermodynamic properties |
Answer» C. newton’s third law |
224. |
The relative velocity is obtained by the equation |
A. | u – v1 |
B. | v1 |
C. | u*v1 |
D. | u/v1 |
Answer» A. u – v1 |
225. |
If the friction is neglected, then |
A. | vr1 > vr2 |
B. | vr1 < vr2 |
C. | vr1 = vr2 |
D. | vr1 is a zero |
Answer» C. vr1 = vr2 |
226. |
Through inlet orifices, which are facing the direction of motion of the ship, the water from the sea can be taken by the pump. |
A. | true |
B. | false |
Answer» A. true |
227. |
Jet propulsion of ship is less efficient than screw propeller due to |
A. | pressure |
B. | temperature |
C. | frictional losses |
D. | wear and tear |
Answer» C. frictional losses |
228. |
A jet strikes a curved plate at its |
A. | sides |
B. | surface |
C. | centre |
D. | does not strike |
Answer» C. centre |
229. |
Which among the following is not a type of jet engine? |
A. | turbojet |
B. | ramjet |
C. | scramjet |
D. | propulsive jet |
Answer» D. propulsive jet |
230. |
The fluid gains while passing through the impeller. |
A. | velocity |
B. | pressure |
C. | temperature |
D. | velocity and pressure |
Answer» D. velocity and pressure |
231. |
What is the shape of the diffuser in the centrifugal pump? |
A. | round |
B. | dough nut |
C. | rectangle |
D. | cylindrical |
Answer» B. dough nut |
232. |
When the casing in a centrifugal pump decelerates the flow, what increases? |
A. | pressure |
B. | temperature |
C. | volume |
D. | flow rate |
Answer» A. pressure |
233. |
The velocity imparted by the impeller is converted into |
A. | pressure energy |
B. | kinetic energy |
C. | momentum |
D. | potential energy |
Answer» A. pressure energy |
234. |
The consequence of Newtons second law is |
A. | conservation of angular momentum |
B. | conservation of mass |
C. | conservation of potential energy |
D. | conservation of kinetic energy |
Answer» A. conservation of angular momentum |
235. |
Euler developed the head pressure equation in centrifugal pumps. |
A. | true |
B. | false |
Answer» A. true |
236. |
What is a major advantage of centrifugal pump? |
A. | cost |
B. | simple in construction |
C. | efficiency |
D. | pump parameters |
Answer» B. simple in construction |
237. |
Different velocities in a centrifugal pump are determined by using |
A. | velocity triangle |
B. | reynolds number |
C. | froude number |
D. | overall efficiency |
Answer» A. velocity triangle |
238. |
With the increase in the input power, efficiency |
A. | increases |
B. | decreases |
C. | same |
D. | independent |
Answer» B. decreases |
239. |
Turbomachines work under |
A. | newtons first law |
B. | newtons second law |
C. | newtons third law |
D. | kepler’s law |
Answer» B. newtons second law |
240. |
The main function of nozzle is to |
A. | pump start procedure |
B. | positive start pump |
C. | pump start pointer |
D. | positive start pointer |
Answer» A. pump start procedure |
241. |
The main function of centrifugal pumps are to |
A. | transfer speed |
B. | transfer pressure |
C. | transfer temperature |
D. | transfer energy |
Answer» D. transfer energy |
242. |
The inlet passage of water entry is controlled by |
A. | head race |
B. | gate |
C. | tail race |
D. | pump |
Answer» B. gate |
243. |
Centrifugal pumps transport fluids by converting |
A. | kinetic energy to hydrodynamic energy |
B. | hydrodynamic energy to kinetic energy |
C. | mechanical energy to kinetic energy |
D. | mechanical energy to hydrodynamic energy |
Answer» A. kinetic energy to hydrodynamic energy |
244. |
With the increase in load, Energy in the turbine |
A. | decreases |
B. | increases |
C. | remains same |
D. | independent |
Answer» A. decreases |
245. |
When the balancing of the turbine is disturbed, we use |
A. | throttle governing |
B. | steam governing |
C. | nozzle governing |
D. | emergency governing |
Answer» D. emergency governing |
246. |
The fluid coming into the centrifugal pump is accelerated by |
A. | throttle |
B. | impeller |
C. | nozzle |
D. | governor |
Answer» B. impeller |
247. |
Reciprocating pump is a |
A. | negative displacement pump |
B. | positive displacement pump |
C. | diaphragm pump |
D. | emulsion pump |
Answer» B. positive displacement pump |
248. |
The cylinder of reciprocating cylinder is made up of |
A. | cast iron |
B. | wrought iron |
C. | aluminium |
D. | copper |
Answer» A. cast iron |
249. |
The higher discharge valve line holds the discharge valve |
A. | open |
B. | closed |
C. | stop functioning |
D. | automatic |
Answer» B. closed |
250. |
Reciprocating pumps are also called as |
A. | force pumps |
B. | mass pumps |
C. | heat pumps |
D. | speed pumps |
Answer» A. force pumps |
251. |
Reciprocating pumps are classified according to |
A. | drag force |
B. | number of cylinders |
C. | shock waves |
D. | flow speed |
Answer» B. number of cylinders |
252. |
Simple hand operating pump is also called as |
A. | froth pump |
B. | bicycle pump |
C. | multistage pumps |
D. | centrifugal pumps |
Answer» B. bicycle pump |
253. |
Internal cavitation in reciprocating pumps occurs due to |
A. | drag force |
B. | cyclic stress |
C. | shock waves |
D. | flow speed |
Answer» C. shock waves |
254. |
Operation of reciprocating motion is done by a source |
A. | power |
B. | energy |
C. | momentum |
D. | inertia |
Answer» A. power |
255. |
High pressure reciprocating pumps are generally from 1500 HP. |
A. | true |
B. | false |
Answer» A. true |
256. |
Which of the following centrifugal pumps has higher specific speed than the others? |
A. | axial flow |
B. | radial flow |
C. | mixed flow |
D. | all centrifugal pumps have same specific speed |
Answer» A. axial flow |
257. |
Pump transfers the mechanical energy of a motor or of an engine into of a fluid. |
A. | pressure energy |
B. | kinetic energy |
C. | either pressure energy or kinetic energy |
D. | pressure energy, kinetic energy or both |
Answer» D. pressure energy, kinetic energy or both |
258. |
Which of the following is NOT a type of positive displacement pumps? |
A. | reciprocating pump |
B. | rotary displacement pump |
C. | centrifugal pump |
D. | none of the mentioned |
Answer» C. centrifugal pump |
259. |
Rotary displacement pumps are suitable for handling |
A. | oils |
B. | gritty liquids |
C. | both oils as well as gritty liquids |
D. | granules |
Answer» A. oils |
260. |
Which of the following is/are not example/s of rotary displacement pumps? |
A. | gear pump |
B. | vane pump |
C. | rotary piston pump |
D. | centrifugal pump |
Answer» D. centrifugal pump |
261. |
pump is also called as velocity pump. |
A. | reciprocating |
B. | rotary displacement |
C. | centrifugal |
D. | screw |
Answer» C. centrifugal |
262. |
Discharge capacity of the reciprocating pump is that of the centrifugal pump. |
A. | higher than |
B. | lower than |
C. | same as |
D. | unpredictable |
Answer» B. lower than |
263. |
The process of filling the liquid into the suction pipe and pump casing up to the level of delivery valve is called as |
A. | filling |
B. | pumping |
C. | priming |
D. | leveling |
Answer» C. priming |
264. |
Main application of liquid ring pump is in which of the following? |
A. | low viscosity products |
B. | heavily aerated liquids |
C. | gentle treatment with high viscosity |
D. | water treatment |
Answer» B. heavily aerated liquids |
265. |
What is the water flow direction in the runner in a Francis turbine? |
A. | axial and then tangential |
B. | tangential and then axial |
C. | radial and then axial |
D. | axial and then radial |
Answer» C. radial and then axial |
266. |
Which of the following runner types will have the highest vane angle at inlet (β1 value)? |
A. | slow runner |
B. | medium runner |
C. | fast runner |
D. | vane angle is defined only for kaplan turbines and not francis turbines |
Answer» C. fast runner |
267. |
2 AXIAL, RADIAL AND MIXED FLOW TURBINES. |
A. | guide vane angle at inlet |
B. | blade angle at inlet |
C. | vane angle at inlet |
D. | blade angle at outlet |
Answer» A. guide vane angle at inlet |
268. |
A hydraulic coupling belongs to the category of |
A. | energy absorbing machines |
B. | energy generating machines |
C. | power absorbing machines |
D. | energy transfer machines |
Answer» D. energy transfer machines |
269. |
The electric power which is obtained from hydraulic energy |
A. | thermal power |
B. | mechanical power |
C. | solar power |
D. | hydroelectric power |
Answer» D. hydroelectric power |
270. |
At present which is cheapest means of generating power |
A. | thermal power |
B. | nuclear power |
C. | hydroelectric power |
D. | electric power |
Answer» C. hydroelectric power |
271. |
Pen stocks are made up of |
A. | steel |
B. | cast iron |
C. | mild steel |
D. | wrought iron |
Answer» A. steel |
272. |
is an inward radial flow reaction turbine? |
A. | pelton turbine |
B. | kaplan turbine |
C. | francis turbine |
D. | propeller turbine |
Answer» C. francis turbine |
273. |
is a axial flow reaction turbines, if vanes are fixed to hub of turbine |
A. | propeller turbine |
B. | francis turbine |
C. | kaplan turbine |
D. | pelton turbine |
Answer» A. propeller turbine |
274. |
Francis and Kaplan turbines are known as |
A. | impulse turbine |
B. | reaction turbine |
C. | axial flow turbine |
D. | mixed flow turbine |
Answer» B. reaction turbine |
275. |
Specific speed of reaction turbine is between? |
A. | 5 and 50 |
B. | 10 and 100 |
C. | 100 and 150 |
D. | 150 and 300 |
Answer» B. 10 and 100 |
276. |
Draft tube is also called |
A. | straight divergent tube |
B. | simple elbow tube |
C. | thermal tube |
D. | elbow tube with varying cross section |
Answer» A. straight divergent tube |
277. |
A draft tube helps in converting kinetic energy into |
A. | electrical work |
B. | mechanical work |
C. | chemical work |
D. | thermal work |
Answer» B. mechanical work |
278. |
Most common application of the draft tube is |
A. | rotor |
B. | motor |
C. | pump |
D. | filter |
Answer» C. pump |
279. |
Draft tube consists of conical diffuser with angles of |
A. | 10 deg |
B. | 20 deg |
C. | 30 deg |
D. | 40 deg |
Answer» A. 10 deg |
280. |
Turbine that consists of draft tubes is called as |
A. | impulse turbine |
B. | curtis turbine |
C. | rateau turbine |
D. | reaction turbine |
Answer» D. reaction turbine |
281. |
The exit diameter for a simple elbow draft tube should be |
A. | large |
B. | small |
C. | very small |
D. | same |
Answer» A. large |
282. |
The other name for elbow with varying cross section tube is called |
A. | pressure tube |
B. | bent draft tube |
C. | velocity tube |
D. | sink tube |
Answer» B. bent draft tube |
283. |
What is the efficiency of the simple elbow type draft tube? |
A. | 10 |
B. | 30 |
C. | 60 |
D. | 90 |
Answer» C. 60 |
284. |
In nozzle governing, the flow rate of steam is regulated by |
A. | nozzles |
B. | pumping |
C. | drafting |
D. | intercooling |
Answer» A. nozzles |
285. |
The flow rate of steam is controlled by regulating the |
A. | steam |
B. | pressure |
C. | temperature |
D. | speed |
Answer» B. pressure |
286. |
What is the purpose of a steam turbine governing? |
A. | controls speed |
B. | controls flow rate |
C. | controls volume |
D. | controls discharge |
Answer» B. controls flow rate |
287. |
When bypass valve is opened to |
A. | increase pressure |
B. | increase unit speed |
C. | increase unit power |
D. | increase the amount of fresh steam |
Answer» D. increase the amount of fresh steam |
288. |
With the increase in load, Energy in the turbine |
A. | decreases |
B. | increases |
C. | remains same |
D. | independent |
Answer» A. decreases |
289. |
When the mechanical speed of the shaft increases beyond 110 percent, we use |
A. | throttle governing |
B. | steam governing |
C. | nozzle governing |
D. | emergency governing |
Answer» D. emergency governing |
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