McqMate
Chapters
| 301. |
The whirl velocity at inlet of a Kaplan turbine is 7.5 m/s and blade velocity is 5 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 93% (in MW)? |
| A. | 0.831 |
| B. | 0.697 |
| C. | 1.362 |
| D. | 0.298 |
| Answer» B. 0.697 | |
| 302. |
In a Kaplan Turbine experimental setup, the power output of the shaft is 4.325 MW. The volume flow rate of water in 15 m3/s at an available head of 50 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
| A. | 57.66 |
| B. | 83.63 |
| C. | 81.33 |
| D. | 79.95 |
| Answer» A. 57.66 | |
| 303. |
The hydraulic efficiency of a Kaplan turbine is 95%, the mechanical efficiency is 93% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)? |
| A. | 80.05 |
| B. | 93.15 |
| C. | 87.55 |
| D. | 88.35 |
| Answer» D. 88.35 | |
| 304. |
Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 305. |
In Kaplan turbine apparatus, the volume flow rate of water in 15 m3/s at an available head of 55 m (g = 10 m/s2). Find the shaft power (in MW) if the overall efficiency of the turbine is 95%. |
| A. | 78.3 |
| B. | 7.83 |
| C. | 783 |
| D. | 0.783 |
| Answer» B. 7.83 | |
| 306. |
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 | |
| 307. |
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 | |
| 308. |
Most common application of the draft tube is |
| A. | Rotor |
| B. | Motor |
| C. | Pump |
| D. | Filter |
| Answer» C. Pump | |
| 309. |
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 | |
| 310. |
What is the purpose of a Draft tube? |
| A. | To prevent flow separation |
| B. | To avoid Pressure drag |
| C. | To prevent rejection of heat |
| D. | To increase efficiency |
| Answer» A. To prevent flow separation | |
| 311. |
What is the maximum value of efficiency in a draft tube? |
| A. | 100 |
| B. | 50 |
| C. | 90 |
| D. | 40 |
| Answer» C. 90 | |
| 312. |
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 | |
| 313. |
Which of the following is a 50 percent reaction turbine? |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» A. Parsons turbine | |
| 314. |
The simple elbow draft tube helps to cut down the cost of excavation. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 315. |
The exit diameter for a simple elbow draft tube should be |
| A. | Large |
| B. | Small |
| C. | Very small |
| D. | Same |
| Answer» A. Large | |
| 316. |
Properties that do not affect a draft tube is |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» B. Temperature | |
| 317. |
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 | |
| 318. |
What is the efficiency of the simple elbow type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» C. 60 | |
| 319. |
The horizontal portion of the draft tube is usually bent to prevent entry of air from the exit end. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 320. |
The efficiency of the draft tube is ratio of |
| A. | Pressure energy by kinetic energy |
| B. | Kinetic energy by Pressure energy |
| C. | Kinetic energy into mechanical energy |
| D. | Pressure into mechanical |
| Answer» B. Kinetic energy by Pressure energy | |
| 321. |
Draft tubes are not used in which of the following turbines? |
| A. | Francis |
| B. | Reaction |
| C. | Kaplan |
| D. | Pelton |
| Answer» D. Pelton | |
| 322. |
The draft tube at the exit of the nozzle increases the |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Density of flow |
| Answer» B. Pressure | |
| 323. |
Efficiency of a draft tube gives |
| A. | Temperature difference |
| B. | Pressure difference |
| C. | Kinetic energy difference |
| D. | Density of flow |
| Answer» C. Kinetic energy difference | |
| 324. |
Cavitation in a draft tube occurs when |
| A. | Temperature difference |
| B. | Pressure drop |
| C. | Kinetic energy difference |
| D. | Density of flow |
| Answer» B. Pressure drop | |
| 325. |
Which among the following is an important parameter to avoid cavitation? |
| A. | Tail race length |
| B. | Head race length |
| C. | Height of draft tube |
| D. | Pump |
| Answer» C. Height of draft tube | |
| 326. |
The draft tube is situated in the |
| A. | Inlet |
| B. | Outlet |
| C. | Tank |
| D. | Nozzle |
| Answer» B. Outlet | |
| 327. |
Which equation is applied to determine the flow? |
| A. | Newtons equation |
| B. | Rutherford’s equation |
| C. | Bernoulli’s equation |
| D. | Faradays equation |
| Answer» C. Bernoulli’s equation | |
| 328. |
Height of the draft tube is denoted by |
| A. | H |
| B. | h |
| C. | z |
| D. | x |
| Answer» C. z | |
| 329. |
Draft tube allows turbine to be placed above the tail race. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 330. |
The efficiency of the draft tube depends on the |
| A. | Heat |
| B. | Pressure |
| C. | Temperature |
| D. | Pressure and temperature |
| Answer» D. Pressure and temperature | |
| 331. |
Draft tubes have shafts |
| A. | Horizontal |
| B. | Vertical |
| C. | Circular |
| D. | Cross sectional |
| Answer» B. Vertical | |
| 332. |
Draft tubes are situated at the outlet in |
| A. | Pelton |
| B. | Reaction |
| C. | Kaplan |
| D. | Francis |
| Answer» A. Pelton | |
| 333. |
Efficiency of a draft tube is directly proportional to its |
| A. | Temperature |
| B. | Pressure |
| C. | Velocity |
| D. | Density |
| Answer» C. Velocity | |
| 334. |
Z is a draft tube is |
| A. | Temperature difference |
| B. | Pressure drop |
| C. | Kinetic energy difference |
| D. | Datum head |
| Answer» D. Datum head | |
| 335. |
Draft tube operates at |
| A. | Same efficiency |
| B. | Different efficiency |
| C. | Turbine |
| D. | Pump |
| Answer» A. Same efficiency | |
| 336. |
The draft tube is an |
| A. | Interior tube |
| B. | Exterior tube |
| C. | Tank depth alternator |
| D. | Nozzle tube |
| Answer» B. Exterior tube | |
| 337. |
What type of pressure does the draft tube depend upon? |
| A. | Gauge pressure |
| B. | Atm pressure |
| C. | Normal pressure |
| D. | Normal and Atm pressure |
| Answer» A. Gauge pressure | |
| 338. |
Gauge pressure of the draft tube is denoted by |
| A. | P |
| B. | h |
| C. | z |
| D. | x |
| Answer» A. P | |
| 339. |
Draft tube allows turbine to be placed below the tail race. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 340. |
Specific speed is denoted by |
| A. | N |
| B. | n |
| C. | Ns |
| D. | S |
| Answer» C. Ns | |
| 341. |
Specific speeds are used in pumps to determine |
| A. | Temperature |
| B. | Reaction speed |
| C. | Suction specific speed |
| D. | Wheel speed |
| Answer» C. Suction specific speed | |
| 342. |
The tube at the exit of the nozzle increases the |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Density of flow |
| Answer» B. Pressure | |
| 343. |
Specific speed is used to characterize |
| A. | Turbomachinery speed |
| B. | Flow speed |
| C. | Energy flow |
| D. | Heat generated |
| Answer» A. Turbomachinery speed | |
| 344. |
Specific speed predicts the shape of a/an |
| A. | Pump |
| B. | Density head |
| C. | Impeller |
| D. | Motor |
| Answer» C. Impeller | |
| 345. |
What helps in categorizing the impellers? |
| A. | Quasi static number |
| B. | Rotor |
| C. | Height of draft tube |
| D. | Pump |
| Answer» A. Quasi static number | |
| 346. |
Imperial units is defined as |
| A. | Temperature by pressure |
| B. | Tail race and head race |
| C. | Revolutions per minute |
| D. | Turbine performance |
| Answer» C. Revolutions per minute | |
| 347. |
Ratio of pump or turbine with reference pump or turbine is called as |
| A. | Efficiency |
| B. | Performance |
| C. | Heat generated |
| D. | Relative velocity |
| Answer» B. Performance | |
| 348. |
Low specific speed in hydraulic head is developed due to |
| A. | Mass flow rate |
| B. | Increase in temperature |
| C. | Centrifugal force |
| D. | Increase in pressure |
| Answer» C. Centrifugal force | |
| 349. |
Centrifugal pump impellers have speed ranging from |
| A. | 500- 10000 |
| B. | 50- 100 |
| C. | 200-300 |
| D. | 0-50 |
| Answer» A. 500- 10000 | |
| 350. |
What is the unit of specific speed in metric system? |
| A. | m.s |
| B. | m/s |
| C. | m3/s |
| D. | m |
| Answer» C. m3/s | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.