McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
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 | |
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