McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 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. |
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 | |
| 276. |
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 | |
| 277. |
Most common application of the draft tube is |
| A. | rotor |
| B. | motor |
| C. | pump |
| D. | filter |
| Answer» C. pump | |
| 278. |
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 | |
| 279. |
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 | |
| 280. |
The exit diameter for a simple elbow draft tube should be |
| A. | large |
| B. | small |
| C. | very small |
| D. | same |
| Answer» A. large | |
| 281. |
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 | |
| 282. |
What is the efficiency of the simple elbow type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» C. 60 | |
| 283. |
In nozzle governing, the flow rate of steam is regulated by |
| A. | nozzles |
| B. | pumping |
| C. | drafting |
| D. | intercooling |
| Answer» A. nozzles | |
| 284. |
The flow rate of steam is controlled by regulating the |
| A. | steam |
| B. | pressure |
| C. | temperature |
| D. | speed |
| Answer» B. pressure | |
| 285. |
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 | |
| 286. |
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 | |
| 287. |
With the increase in load, Energy in the turbine |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | independent |
| Answer» A. decreases | |
| 288. |
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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