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MCQOPTIONS
This section includes 2670 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 1301. |
Consider the following statements: 1. A draft tube may be fitted to the tail end of a Pelton head. 2. Kaplan turbine is an axial flow reaction turbine with adjustable vanes on the 3. Modem Francis turbine is a mixed flow reaction turbine. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3. |
| Answer» D. 1 and 3. | |
| 1302. |
Which of the following purposes are served by the volute casing of a centrifugal pump? 1. Increase in the efficiency of the pump. 2. Conversion of part of the pressure head to velocity head. 3. Giving uniform flow of the fluid coming out of the impeller. Select the correct answer using the codes given below: |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 1303. |
Consider the following statements in respect of centrifugal pumps: 1. Head developed is proportional to the square of the speed of rotation. 2. Backward curved bladed impellers arc generally used in centrifugal pumps. 3. These pumps generally do not require priming. 4. Multistage pumps would give higher discharge proportional to the number of stages. Which of these statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» B. 2 and 3 | |
| 1304. |
Consider the following statements regarding the specific speed of a centrifugal pump: 1. Specific speed is defined as the speed of a geometrically similar pump developing unit power under unit head. 2. At the same specific speed, the efficiency is greater with larger capacity 3. The specific speed increases with increase in outer blade angle 4. The specific speed varies directly as the square root of the pump discharge. Of these statements: |
| A. | 1 and 2 are correct |
| B. | 2 and 4 are correct |
| C. | 3 and 4 are correct |
| D. | 2 and 3 are correct |
| Answer» C. 3 and 4 are correct | |
| 1305. |
Consider the following turbines: 1. Kaplan 2. Pelton wheel 3. Francis The correct sequence in increasing order of the specific speeds of these turbines is: |
| A. | 2, 3, 1 |
| B. | 2, 1, 3 |
| C. | 3, 1, 2 |
| D. | 1, 2, 3 |
| Answer» B. 2, 1, 3 | |
| 1306. |
A pelton wheel is ideally suited for: |
| A. | High head and low discharge |
| B. | High head and high discharge |
| C. | Low head and low discharge |
| D. | Medium head and medium discharge |
| Answer» B. High head and high discharge | |
| 1307. |
Which one of the following turbines is used in underwater power stations? |
| A. | Pelton turbine |
| B. | Deriaz turbine |
| C. | Tubular turbine |
| D. | Turgo-impulse turbine. |
| Answer» D. Turgo-impulse turbine. | |
| 1308. |
Which one of the following forms of draft tube will NOT improve the hydraulic efficiency of the turbine? |
| A. | Straight cylindrical |
| B. | Conical type |
| C. | (e) Bell-mouthed |
| D. | Bent tube. |
| Answer» B. Conical type | |
| 1309. |
A centrifugal pump is started with its delivery valve kept: |
| A. | Fully open |
| B. | fully closed |
| C. | Partially open |
| D. | 50% open. |
| Answer» C. Partially open | |
| 1310. |
Which one of the following statements regarding an impulse turbine is correct? |
| A. | There is no pressure variation in flow over the buckets and the fluid fills the passageway between the buckets |
| B. | There is no pressure variation in flow over the buckets and the fluid does not fill the passageway between the buckets |
| C. | There is pressure drop in flow over the buckets and the fluid fills the passageway between the buckets |
| D. | There is pressure drop in flow over the buckets and the fluid does not fill the passageway between the buckets. |
| Answer» B. There is no pressure variation in flow over the buckets and the fluid does not fill the passageway between the buckets | |
| 1311. |
In contrast to fluid couplings, torque Converters are operated: |
| A. | While completely filled with liquid |
| B. | While partially filled with liquid |
| C. | Without liquid |
| D. | While completely filled with air. |
| Answer» B. While partially filled with liquid | |
| 1312. |
Consider the following statements regarding torque converter: 1. It has a stationary set of blades in addition to the primary and secondary rotors. 2. It can be used for multiplication of torques. 3. The maximum efficiency of a inverter is less than that of a fluid coupling 4. In a converter designed to give a large increase of torque, the efficiency........speed ratio approaches unity. Of these statements: |
| A. | 1, 2, 3 and 4 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 1, 2 and 4 are correct |
| D. | 3 and 4 are correct |
| Answer» C. 1, 2 and 4 are correct | |
| 1313. |
As water flows through the runner of a reaction turbine, pressure acting on it would vary from: |
| A. | More than atmospheric pressure to vacuum |
| B. | Less than atmospheric pressure to zero gauge pressure |
| C. | Atmospheric pressure to more than atmospheric pressure |
| D. | Atatmospheric pressure to vacuum. |
| Answer» B. Less than atmospheric pressure to zero gauge pressure | |
| 1314. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Head race 1. Channel, tunnel or pipes through which water is carried from reservoir to the turbine B. Tail race 2. Reservoir water level C. Penstock 3. Diverging tube discharging water from the turbine to the atmosphere D. Draft tube 4. The level at which water is discharged a atmospheric pressure Codes: |
| A. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| B. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| Answer» C. A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 | |
| 1315. |
Match List-I with List-II and select the correct answer. List-I List-II A. Pelton wheel (single jet) 1. Medium discharge, low head B. Francis Turbine 2. High discharge, low head C. Kaplan Turbine 3. Medium discharge medium head 4. Low discharge high head Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]1, C\[\to \]3 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]2 |
| Answer» E. | |
| 1316. |
The Specific speed of a turbine is defined as the speed of a member of the same homologous series of such a size that it: |
| A. | Delivers unit discharge at unit head. |
| B. | Delivers unit discharge at unit power. |
| C. | Delivers unit power at unit discharge. |
| D. | Produces unit power under the unit head. |
| Answer» E. | |
| 1317. |
Euler equation for water turbine is derived on the basis of: |
| A. | conservation of mass |
| B. | Rate of change of linear momentum |
| C. | Rate of change of angular momentum |
| D. | Rate of change of velocity. |
| Answer» C. Rate of change of angular momentum | |
| 1318. |
Consider the following statements: Cavitation in hydraulic machines occurs at the 1. Exit of a pump 2. Entry of the pump 3. Exit of a turbine Of these statements: |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 1, 2 and 3 are correct |
| D. | 2 and 3 are correct |
| Answer» C. 1, 2 and 3 are correct | |
| 1319. |
For attaining a non-overloading characteristic in centrifugal pumps: |
| A. | Backward bent vanes are preferred over forward bent vanes. |
| B. | Forward bent vanes are preferred over backward bent vanes. |
| C. | Forward bent vanes are preferred over vanes radial at outlet. |
| D. | Vanes radial at outlet are preferred over backward vanes. |
| Answer» B. Forward bent vanes are preferred over backward bent vanes. | |
| 1320. |
Which of following are the beneficial effects of air vessel fitted to delivery side of a reciprocating pump? 1. Constant rate of discharge can be ensured 2. Power consumption can be reduced 3. Discharge can he increased 4. Constant velocity of the piston can he ensured. Select the correct answer using the codes given below: |
| A. | 1 and 4 |
| B. | 1 and 2 |
| C. | 2 and 4 |
| D. | 1 and 3 |
| Answer» C. 2 and 4 | |
| 1321. |
The movable wicket gates of a reaction turbine are used to: |
| A. | Control the flow of water passing through the turbine |
| B. | Control tile pressure under which the turbine is working. |
| C. | Strengthen the casing of the turbine. |
| D. | Reduce the size of the turbine. |
| Answer» B. Control tile pressure under which the turbine is working. | |
| 1322. |
A centrifugal pump delivers water at the rate of 50 litres/s against a total head of 40 metres. Then the Power required to drive the pump is: |
| A. | 2 k W |
| B. | 15.2 k W |
| C. | 19.6 k W |
| D. | 25.8 k W |
| Answer» D. 25.8 k W | |
| 1323. |
Which of the following are the functions of a volute casing in a centrifugal pump? 1. To collect water from the periphery of the impeller and to transmits it to the delivery pipe at a constant velocity. 2. To increase the discharge of the pump. 3. To increase the efficiency of the pump. 4. To reduce the loss of head in discharge. Select the correct answer from the codes given below: |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 3 and 4 |
| D. | 1 and 2 |
| Answer» D. 1 and 2 | |
| 1324. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Tapes of turbines) List-II (Characteristics of turbines) A. Propeller 1. Inward flow reaction B. Francis 2. Tangential flow impulse C. Kaplan 3. Axial flow reaction with fixed vanes D. Pelton 4. Axial flow reaction with adjustable vanes Codes: |
| A. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| Answer» E. | |
| 1325. |
The following lists refer to fluid machinery Match List-I with List-II and select the correct answer using the codes given below the Lists: List-I List-II A. Draft tube 1. Impulse turbine B. Surging 2. Reciprocating pump C. Air Vessel 3. Reaction turbine D. Nozzle 4. Centrifugal pump Codes: |
| A. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| Answer» C. A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 | |
| 1326. |
Specific speed of a pump and specific speed of a turbine are: (symbols have the usual meaning) |
| A. | \[\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] and \[\frac{N\sqrt{P}}{{{H}^{5/4}}}\] respectively |
| B. | \[\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] and \[\frac{N\sqrt{P}}{{{H}^{3/4}}}\] respectively |
| C. | \[\frac{N\sqrt{Q}}{{{H}^{5/4}}}\] and \[\frac{N\sqrt{P}}{{{H}^{5/4}}}\] respectively |
| D. | \[\frac{N\sqrt{Q}}{{{H}^{5/4}}}\] and \[\frac{N\sqrt{P}}{{{H}^{3/4}}}\] respectively |
| Answer» B. \[\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] and \[\frac{N\sqrt{P}}{{{H}^{3/4}}}\] respectively | |
| 1327. |
In the statement, "in a reaction turbine installation, the head of water is decreased and the rpm is also decreased at a certain condition of working. The effect of each of these changes will be to X power delivered due to decrease in head and to \[\gamma \] power delivered due to decrease in rpm?. \[\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] X and Y stand respectively for: |
| A. | Decrease and increase |
| B. | Increase and increase |
| C. | Decrease and decrease |
| D. | Increase and decrease. |
| Answer» B. Increase and increase | |
| 1328. |
The specific speed of a hydraulic pump is the Speed of geometrically similar pump working against a unit head and: |
| A. | Delivering unit quantity of water |
| B. | Consuming unit power |
| C. | Having unit velocity of flow |
| D. | Having unit radial velocity |
| Answer» B. Consuming unit power | |
| 1329. |
Chances of occurrence of cavitation are high if the: |
| A. | Local pressure becomes very high |
| B. | Local temperature becomes low |
| C. | Thoma cavitation parameter exceeds a certain limit |
| D. | Local pressure falls below the vapour pressure. |
| Answer» E. | |
| 1330. |
Match the following: List-I List-II A. Wicket gates 1. Gradually converts the velocity head to pressure head B. Volute tube 2. Pressure head recovery C. Draft tube 3. High value of N and N D. Axial flow 4. Adjustable by governor pumps according to head Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| Answer» B. A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 | |
| 1331. |
Hydraulic transmission through fluid coupling is suitable for: |
| A. | Unsteady operation and increasing torque |
| B. | Unsteady operation and increasing speed |
| C. | Unsteady operation and low starting torque |
| D. | Increasing torque and low starting load |
| Answer» D. Increasing torque and low starting load | |
| 1332. |
Air vessel is used in a reciprocating pump to obtain: |
| A. | Reduction of suction head |
| B. | Rise in delivery head |
| C. | Continuous supply of water at uniform rate |
| D. | Increase in supply of water |
| Answer» B. Rise in delivery head | |
| 1333. |
consider the following characteristics: 1. The fluid enters the pump axially and is discharged radially. 2. Maximum efficiency may be of the order of 90%. 3. Development of a low head. 4. A limited section capacity. Witch of the above characteristics are possessed by axial flow pumps? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 2 and 4 |
| D. | 3 and 4 |
| Answer» E. | |
| 1334. |
Which of the following statements are false regarding the relation Specific speed. \[{{N}_{s}}\left( \frac{N\sqrt{Q}}{{{H}^{5/4}}} \right)\] |
| A. | The relation is valid for both impulse as well as reaction turbines |
| B. | The value of specific speed depends on the system of units |
| C. | The value of specific speed for pelton wheel will be lower than that for Kaplan turbine for any system of units |
| D. | The dimensions of specific speed are: \[(FLT{{\,}^{-\,1}})\] |
| Answer» E. | |
| 1335. |
A centrifugal pump was manufactured to couple directly to a 15 HP. electric motor running at 1950 rpm delivering 50 liters per minute against a total head of 20 m. It is desired to replace the pump. The head developed by pump is likely to be: |
| A. | 41.4 m |
| B. | 29.6 m |
| C. | 20 m |
| D. | 9.5 m |
| Answer» D. 9.5 m | |
| 1336. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Draft tube 1. Impulse turbine B. Surging 2. Reciprocating pump C. Air Vessel 3. Reaction turbine D. Nozzle 4. Centrifugal pump Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| Answer» C. A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 | |
| 1337. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Specific speed of pump 1. \[\left( \frac{N\sqrt{Q}}{{{H}^{3/4}}} \right)\] B. Low specific speed of turbine. 2. Screw pump C. Pumping viscous oil 3. Reaction turbine D. Draft tube 4. Turbine Pump 5. Very high specific speed 6. \[\left( \frac{N\sqrt{P}}{{{H}^{5/4}}} \right)\] 7. Impulse turbine Codes: |
| A. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]5 |
| B. | A\[\to \]6, B\[\to \]7, C\[\to \]4, D\[\to \]3 |
| C. | A\[\to \]1, B\[\to \]7, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]6, B\[\to \]3, C\[\to \]4, D\[\to \]5 |
| Answer» D. A\[\to \]6, B\[\to \]3, C\[\to \]4, D\[\to \]5 | |
| 1338. |
The speed ratio for Pelton wheel varies from: |
| A. | \[0.45\,-\,0.50\] |
| B. | \[0.6\,-\,0.7\] |
| C. | \[0.30\,-\,0.40\] |
| D. | \[0.8\,-\,0.9\] |
| Answer» B. \[0.6\,-\,0.7\] | |
| 1339. |
Consider the following statements: In hydraulic power plants 1. Pelton turbines are used for high heads. 2. Kaplan turbines are used for medium heads. 3. Francis turbines are used for low heads. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 2 only | |
| 1340. |
Match List-I (Type of Turbine) with List-II (Specific Speed) and select the correct answer using the code given below the lists: List-I (Type of Turbine) List-II (Specific Speed) A. Pelton 1. 0.1 B. Francis 2. 3.0 C. Propeller 3. 4.0 D. Kaplan 5. 1.0 Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| C. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» B. A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 | |
| 1341. |
Which one of the following is the purpose of a surge tank in a Pelton turbine station? |
| A. | It acts as a temporary storage during load changes, |
| B. | It prevents hydraulic jump |
| C. | It prevents surges at the transformer |
| D. | It prevents water hammer due to sudden reduction in load. |
| Answer» B. It prevents hydraulic jump | |
| 1342. |
Consider the following statements with regard to the specific speeds of different types of 1. High specific speed implies that it is a Pelton wheel 2. Medium specific speed implies that it is an axial flow turbine 3. Low specific speed implies that it is a Francis turbine 4. Which of these statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | None |
| Answer» D. None | |
| 1343. |
Which one of the following helps in avoiding cavitation in centrifugal pumps? |
| A. | Low suction pressure |
| B. | High delivery pressure |
| C. | Low delivery pressure |
| D. | High suction pressure |
| Answer» E. | |
| 1344. |
Match List-1 with List-11 and select the correct answer using the codes given below the lists: List-I (Water Turbines) List-II (Application) A. Pelton 1. High head and low discharge B. Francis 2. High head and high discharge C. Kaplan 3. Medium head and medium discharge 4. Low head and high discharge Codes: |
| A. | A\[\to \]1, B\[\to \]3, C\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]3 |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]4 |
| Answer» C. A\[\to \]2, B\[\to \]4, C\[\to \]3 | |
| 1345. |
The function of the draft tube in a reaction turbine is: |
| A. | To enable the shaft of the turbine to be vertical |
| B. | To transform a large part of pressure energy at turbine outlet into kinetic energy |
| C. | To avoid whirl losses at the exit of the turbine |
| D. | To transform a large part of kinetic energy at the turbine outlet into pressure energy. |
| Answer» E. | |
| 1346. |
The location of a surge tank in a high head hydraulic power plant would be: |
| A. | Nearer to the dam |
| B. | At the powerhouse |
| C. | Nearest to the powerhouse |
| D. | Immaterial |
| Answer» D. Immaterial | |
| 1347. |
For an impulse turbine with exit angle '\[\phi \]', the maximum hydraulic efficiency is: |
| A. | \[\left( 1-\frac{\cos \phi }{2} \right)\] |
| B. | \[\left( \frac{1}{2}+\cos \phi \right)\] |
| C. | \[\left( \frac{1+\cos \phi }{2} \right)\] |
| D. | \[\left( \frac{1-\cos \phi }{2} \right)\] |
| Answer» D. \[\left( \frac{1-\cos \phi }{2} \right)\] | |
| 1348. |
Which one of the following statements regarding ammonia absorption system is correct? |
| A. | A function of the temperature and pressure of the solution |
| B. | A function of the pressure of the solution irrespective of the temperature |
| C. | A function of the temperature of the solution alone |
| D. | Independent of the temperature and pressure of the solution |
| Answer» B. A function of the pressure of the solution irrespective of the temperature | |
| 1349. |
For discharge 'Q' the specific speed of a pump is\['{{N}_{s}}'.\] For half discharge with the same head, the specific speed will be: |
| A. | \[{{N}_{s}}\] |
| B. | \[\sqrt{2}{{N}_{s}}\] |
| C. | \[\frac{{{N}_{s}}}{\sqrt{2}}{{N}_{s}}\] |
| D. | \[2{{N}_{s}}.\] |
| Answer» C. \[\frac{{{N}_{s}}}{\sqrt{2}}{{N}_{s}}\] | |
| 1350. |
Unit power \[{{P}_{1}}\] is given by the expression: |
| A. | \[{{P}_{1}}=\frac{p}{\sqrt{H}}\] |
| B. | \[{{P}_{1}}=\frac{p}{{{H}^{3/2}}}\] |
| C. | \[{{P}_{1}}=\frac{p}{{{H}^{3/4}}}\] |
| D. | \[{{P}_{1}}=\frac{p}{{{H}^{3/5}}}\] |
| Answer» C. \[{{P}_{1}}=\frac{p}{{{H}^{3/4}}}\] | |