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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.
| 1351. |
Consider the following statements: 1. A reverse jet protects Pelton turbine from over speeding. 2. Runner blades of Francis turbine are adjustable. 3. Draft tube is used invariably in all reaction turbine installations. 4. Surge tank is a protective device on penstock. Of these statements: |
| A. | 1 and 2 are correct |
| B. | 2 and 3 are correct |
| C. | 3 and 4 are correct |
| D. | 1 and 4 are correct. |
| Answer» D. 1 and 4 are correct. | |
| 1352. |
Which one of the following is an example of a pure (100%) reaction machine? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Modern gas turbine |
| D. | Lawn sprinkler |
| Answer» C. Modern gas turbine | |
| 1353. |
Based on the direction of flow, which one of the following turbines is different from the other three? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Dc Laval turbine |
| D. | Parson's turbine |
| Answer» C. Dc Laval turbine | |
| 1354. |
Which one of the following is not correct regarding both Kaplan and propeller turbines? |
| A. | The runner is axial |
| B. | The blades are wing type |
| C. | There are four to eight blades |
| D. | The blades can he adjusted. |
| Answer» E. | |
| 1355. |
Consider the following statements: In the thermoelectric refrigeration, the coefficient of performance is a function of: 1. Electrical conductivity of materials. 2. Peltier coefficient 3. See beck coefficient 4. Temperature at cold and hot functions 5. Thermal conductivity of materials. Of these statements: |
| A. | 1, 3, 4 and 5 are correct |
| B. | 1, 2, 3 and 5 correct |
| C. | 1, 2, 4 and 5 correct |
| D. | 2, 3, 4 and 5 correct |
| Answer» C. 1, 2, 4 and 5 correct | |
| 1356. |
Which one of the following correctly expresses the specific speed of a turbine and a pump, respectively? |
| A. | \[\frac{N\sqrt{Q}}{{{H}^{3/4}}},\frac{N\sqrt{P}}{{{H}^{5/4}}}\] |
| B. | \[\frac{N\sqrt{P}}{{{H}^{3/4}}},\frac{N\sqrt{Q}}{{{H}^{5/4}}}\] |
| C. | \[\frac{N\sqrt{P}}{{{H}^{5/4}}},\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] |
| D. | \[\frac{N\sqrt{P}}{{{H}^{7/4}}},\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] |
| Answer» D. \[\frac{N\sqrt{P}}{{{H}^{7/4}}},\frac{N\sqrt{Q}}{{{H}^{3/4}}}\] | |
| 1357. |
Cavitation damage in the turbine runner occurs near the: |
| A. | inlet on the concave side of the blades |
| B. | Outlet on the concave side of the blades |
| C. | Outlet on the convex side of the blades |
| D. | Inlet on the convex side of the blades |
| Answer» C. Outlet on the convex side of the blades | |
| 1358. |
In hydraulic power-generation systems, surge tanks are provided to prevent immediate damage to: |
| A. | Draft tube |
| B. | turbine |
| C. | Tail race |
| D. | penstocks. |
| Answer» E. | |
| 1359. |
Bernoulli's equation is derived by making which one of the following assumptions? |
| A. | The flow is steady only |
| B. | The flow is uniform and incompressible |
| C. | The flow is non-viscous, uniform and steady |
| D. | The flow is steady, non-viscous, incompressible and irrotational. |
| Answer» E. | |
| 1360. |
Consider the following statements: A rectangular block of wood of size \[L\times B\times H\]float in water in such a way that: (1) The longest dimension is vertical (2) The longest dimension is horizontal (3) The metacentre is above Centre of gravity (4) The Centre of buoyancy is above the Centre of gravity Which of the statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only 3, only |
| C. | 2, 3 and 4 |
| D. | 1, 3 and 4 |
| Answer» C. 2, 3 and 4 | |
| 1361. |
Which one of the following statements is correct stability of a floating body: |
| A. | M should lie between G and B (in that order) |
| B. | M should lie above B and G (in that order) |
| C. | M should lie below B and G (in that order) |
| D. | M should coincide with B and G |
| Answer» C. M should lie below B and G (in that order) | |
| 1362. |
Which one of the following is the correct statement? A frictionless, incompressible fluid flows steadily through a convergent nozzle, then its. |
| A. | Energy must decrease |
| B. | Velocity must decrease |
| C. | Pressure must decrease |
| D. | Momentum must decrease |
| Answer» D. Momentum must decrease | |
| 1363. |
Match List-I (Forms of Bernouli'sEquation ) with List-II (Units of these forms) and select the correct answer using codes given below the lists: List-I (from of Bernouli?s Equation) List-II (Units of these forms) A. \[p+wz+\frac{\rho {{V}^{2}}}{2}\] 1. Total energy per unit volume B. \[\frac{p}{\acute{A}}+gz+\frac{{{V}^{2}}}{2}\] 2. Total energy per unit mass C. \[\frac{p}{w}+z+\frac{{{V}^{2}}}{2g}\] 3. Total energy per unit weight Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]1 |
| Answer» B. A\[\to \]1, B\[\to \]3, C\[\to \]2 | |
| 1364. |
Which one of the following expresses the error in discharge due to error in the measurement of head over a triangular notch? |
| A. | \[\frac{dQ}{Q}=\frac{5dH}{2H}\] |
| B. | \[\frac{dQ}{Q}=\frac{3dH}{2H}\] |
| C. | \[\frac{dQ}{Q}=\frac{7dH}{2H}\] |
| D. | \[\frac{dQ}{Q}=\frac{1dH}{2H}\] |
| Answer» B. \[\frac{dQ}{Q}=\frac{3dH}{2H}\] | |
| 1365. |
Consider the following statements: The coefficient of discharge \[{{C}_{d}}\] of a venturimeter takes into account. 1. The effect of roughness of the surface 2. Non-uniform velocity distributions at inlet and throat section. 3. Reynolds number of flow 4. Discharge 5. Length of throat 6. Diameter of throat 7. Diameter ratio Which of the statements given above are correct? |
| A. | 1, 2, 4 and 5 |
| B. | 1, 4, 5 and 6 |
| C. | 1, 2, 3 and 7 |
| D. | 2, 6 and 7 |
| Answer» B. 1, 4, 5 and 6 | |
| 1366. |
Which one of the following is the correct statement? For the case of laminar flow between two fixed parallel plates, the shear stress is |
| A. | Constant across the passage |
| B. | Maximum at the Centre and zero at the boundary |
| C. | Zero all through the passage |
| D. | Maximum at the boundary and zero at the centre |
| Answer» E. | |
| 1367. |
Which one of the following is the correct statement? The velocity profiles for fully developed laminar and turbulent flow, respectively, in a pipe are: |
| A. | Parabolic and parabolic |
| B. | Parabolic and elliptic |
| C. | Linear and 1/7 power law |
| D. | Parabolic and 1/7 power law |
| Answer» E. | |
| 1368. |
Motion economy is better achieved by |
| A. | Method study |
| B. | Time study |
| C. | Work space design |
| D. | Process planning. |
| Answer» B. Time study | |
| 1369. |
Which one of the following equations gives the velocity distribution across a circular pipe having a viscous flow? |
| A. | \[u={{u}_{\max }}\,[1-{{(r/R)}^{2}}]\] |
| B. | \[u={{u}_{\max }}\,[{{R}^{2}}-{{r}^{2}}]\] |
| C. | \[u={{u}_{\max }}\,{{[1-(r/R)]}^{2}}\] |
| D. | \[u={{u}_{\max }}\,{{[1+(r/R)]}^{2}}\] |
| Answer» B. \[u={{u}_{\max }}\,[{{R}^{2}}-{{r}^{2}}]\] | |
| 1370. |
The velocity distribution in laminar boundary layer is given by the relation \[u/{{u}_{x}}=y/\delta .\] What is the displacement thickness for the boundary layer? |
| A. | \[\delta \] |
| B. | \[\delta /2\] |
| C. | \[\delta /3\] |
| D. | \[\delta /4\] |
| Answer» D. \[\delta /4\] | |
| 1371. |
Darcy-Weisback equation for the head loss in a flow through a pipe is given by \[{{h}_{1}}=4\,fl{{v}^{2}}\] (2gd) (the symbols have the usual meaning). For the laminar flow through a circular pipe, how does the friction factor \[f\] vary with the Reynolds number (Re): |
| A. | \[f=\text{8/Re}\] |
| B. | \[f=16\text{/Re}\] |
| C. | \[f=32\text{/Re}\] |
| D. | \[f=64\text{/Re}\] |
| Answer» E. | |
| 1372. |
Consider the following statements: The state of stress in a fluid consists of normal pressure only if the fluid: 1. is at rest 2. Is in uniform motion 3. Has non-uniform velocity profile 4. Has zero viscosity. Which of the statements given above are correct? |
| A. | 1, 2 and 3 |
| B. | 1, 2 and 4 |
| C. | 1, 3 and 4 |
| D. | 2, 3 and 4 |
| Answer» C. 1, 3 and 4 | |
| 1373. |
Using the Prandtl's mixing length concept, how is the turbulent shear stress expressed? |
| A. | \[\rho l\,\overline{\frac{du}{dy}}\] |
| B. | \[\rho {{l}^{2}}\,\overline{\frac{du}{dy}}\] |
| C. | \[\rho l\,{{\left( \overline{\frac{du}{dy}} \right)}^{2}}\] |
| D. | \[\rho {{l}^{2}}\,{{\left( \overline{\frac{du}{dy}} \right)}^{2}}\] |
| Answer» E. | |
| 1374. |
Which one of the following is satisfied if the flow is irrotational for a two-dimensional fluid element in the \[x-y\] plane? |
| A. | \[\frac{\partial v}{\partial x}=\frac{\partial u}{\partial y}\] |
| B. | \[\frac{\partial v}{\partial x}=\frac{\partial u}{\partial y}\] |
| C. | \[\frac{\partial u}{\partial x}=\frac{\partial v}{\partial y}\] |
| D. | \[\frac{\partial u}{\partial x}=\frac{\partial v}{\partial y}\] |
| Answer» B. \[\frac{\partial v}{\partial x}=\frac{\partial u}{\partial y}\] | |
| 1375. |
What will be the maximum efficiency of the pipeline if one-third of the available head in flow through the pipeline is consumed by friction? |
| A. | 33.33% |
| B. | 0.5 |
| C. | 66.66% |
| D. | 0.75 |
| Answer» D. 0.75 | |
| 1376. |
Which one of the following is the continuity equation in differential form? (The symbols have usual meanings) |
| A. | \[\frac{dA}{A}+\frac{dV}{V}+\frac{d\rho }{\rho }=\text{constant}\] |
| B. | \[\frac{dA}{A}+\frac{dV}{V}+\frac{d\rho }{\rho }=0\] |
| C. | \[\frac{A}{dA}+\frac{V}{dV}+\frac{\rho }{d\rho }=\text{constant}\] |
| D. | \[AdA+VdA+\rho d\rho =0\] |
| Answer» C. \[\frac{A}{dA}+\frac{V}{dV}+\frac{\rho }{d\rho }=\text{constant}\] | |
| 1377. |
When a fait plate of \[0.1\,{{m}^{2}}\] area is pulled at a constant velocity of 30 cm/s parallel to another stationary plate pocaled at a distance 0.01 cm from it and the space in between filled with a fluid of dynamic viscosity \[=\,\,0.01\,\,\text{Ns/}{{\text{m}}^{\text{2,}}}\] the force required to be applied is |
| A. | 0.3 N |
| B. | 3 N |
| C. | 10 N |
| D. | 16 N |
| Answer» C. 10 N | |
| 1378. |
The thickness of turbulent boundary layer at a distance x from the leading edge on a flat plate varies as: |
| A. | \[{{x}^{4/5}}\] |
| B. | \[{{x}^{3/5}}\] |
| C. | \[{{x}^{1/2}}\] |
| D. | \[{{x}^{1/5}}\] |
| Answer» B. \[{{x}^{3/5}}\] | |
| 1379. |
Laminar sub-layer may develop during flow over a flat-plate. It exists in: |
| A. | Laminar zone |
| B. | Transition zone |
| C. | Turbulent zone |
| D. | Laminar and transition zone |
| Answer» D. Laminar and transition zone | |
| 1380. |
Which one of the following is the correct relationship between the boundary layer thickness \[\delta ,\] displacement thickness \[\delta *\] and the momentum thickness \[\theta ?\] |
| A. | \[\delta <\delta *>\theta \] |
| B. | \[\delta *>\theta >\delta \] |
| C. | \[\theta >\delta >\delta *\] |
| D. | \[\theta >\delta *>\delta \] |
| Answer» B. \[\delta *>\theta >\delta \] | |
| 1381. |
Which one of the following is the characteristics a fully developed laminar: |
| A. | The pressure drop in the flow direction is zero |
| B. | The velocity profile changes uniformly in the flow direction |
| C. | The velocity profile does not change in the flow direction |
| D. | The Reynolds number for the flow is critical. |
| Answer» C. The velocity profile does not change in the flow direction | |
| 1382. |
What is the percentage error in the estimation of the discharge due to an error of 2% in the measurement of the reading of a differential manometer connected to an orifice meter? |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 1383. |
Which one of the following is caused by the occurrence of a normal shock in the diverging section of a convergent-divergent nozzle? 1. Velocity jump 2. Pressure jump 3. Velocity drop 4. Pressure drop Select the correct answer using the codes given below: |
| A. | 1 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 4 |
| Answer» E. | |
| 1384. |
In a laminar boundary layer over a flat plate, what would be the ratio of wall shear stresses \[{{\tau }_{1}}\] and \[{{\tau }_{2}}\] at the two sections which lie at distances \[{{x}_{1}}=30\,\,cm\] and \[{{x}_{2}}=90\,\,cm\] from the leading edge of the plate? |
| A. | \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=3.0\] |
| B. | \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\frac{1}{3}\] |
| C. | \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\,\,{{\left( 3.0 \right)}^{1/2}}\] |
| D. | \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\,\,\left( 3.0 \right)\] |
| Answer» D. \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\,\,\left( 3.0 \right)\] | |
| 1385. |
The displacement thickness at. Section, for an air stream \[\left( \rho \,\,=\,\,1.2\,\,\text{kg/}{{\text{m}}^{\text{3}}} \right)\] moving with a velocity of 10 m/s over a flat plate is 0.5 mm. What is the loss of mass rate of flow of air due to boundary layer formation in kg per meter width of plate per second? |
| A. | \[6\times {{10}^{-3}}\] |
| B. | \[6\times {{10}^{-5}}\] |
| C. | \[3\times {{10}^{-3}}\] |
| D. | \[2\times {{10}^{-3}}\] |
| Answer» B. \[6\times {{10}^{-5}}\] | |
| 1386. |
Which one of the following is the expression for momentum thickness \[\theta \] of a boundary layer? |
| A. | \[\theta ={{\int\limits_{0}^{\delta }{\left[ 1-\frac{U}{{{U}_{0}}} \right]}}^{2}}\,dy\] |
| B. | \[\theta ={{\int\limits_{0}^{\delta }{\left[ 1-\frac{U}{{{U}_{0}}} \right]}}^{2}}\,dy\] |
| C. | \[\theta =\int\limits_{0}^{\delta }{\,\frac{U}{{{U}_{0}}}\left[ 1-\frac{U}{{{U}_{0}}} \right]}\,\,dy\] |
| D. | \[\theta =\int\limits_{0}^{\delta }{\,\frac{U}{{{U}_{0}}}\left[ 1-\,{{\left( \frac{U}{{{U}_{0}}} \right)}^{2}} \right]}\,\,dy\] |
| Answer» D. \[\theta =\int\limits_{0}^{\delta }{\,\frac{U}{{{U}_{0}}}\left[ 1-\,{{\left( \frac{U}{{{U}_{0}}} \right)}^{2}} \right]}\,\,dy\] | |
| 1387. |
What is the discharge for laminar flow through a pipe of diameter 40 mm having centre line velocity of 1.5 m/s? |
| A. | \[\frac{3\pi }{59}\,{{\text{m}}^{\text{3}}}\text{/s}\] |
| B. | \[\frac{3\pi }{2,500}\,{{\text{m}}^{\text{3}}}\text{/s}\] |
| C. | \[\frac{3\pi }{5000}\,{{\text{m}}^{\text{3}}}\text{/s}\] |
| D. | \[\frac{3\pi }{10000}\,{{\text{m}}^{\text{3}}}\text{/s}\] |
| Answer» D. \[\frac{3\pi }{10000}\,{{\text{m}}^{\text{3}}}\text{/s}\] | |
| 1388. |
For two-dimensionaly fluid element in x-y plane the rotational component is given by: |
| A. | \[{{\omega }_{z}}=\frac{1}{2}\,\,\left( \frac{\partial u}{\partial x}-\frac{\partial v}{\partial y} \right)\] |
| B. | \[{{\omega }_{z}}=\frac{1}{2}\,\,\left( \frac{\partial u}{\partial x}+\frac{\partial v}{\partial y} \right)\] |
| C. | \[{{\omega }_{z}}=\frac{1}{2}\,\,\left( \frac{\partial v}{\partial x}-\frac{\partial u}{\partial y} \right)\] |
| D. | \[{{\omega }_{z}}=\frac{1}{2}\,\,\left( \frac{\partial v}{\partial x}-\frac{\partial u}{\partial y} \right)\] |
| Answer» E. | |
| 1389. |
The thickness of turbulent boundary layer at a distance x from the leading edge over a flat plate varies as: |
| A. | \[{{x}^{4/5}}\] |
| B. | \[{{x}^{1/2}}\] |
| C. | \[{{x}^{1/5}}\] |
| D. | \[{{x}^{3/5}}\] |
| Answer» B. \[{{x}^{1/2}}\] | |
| 1390. |
The square root of the ratio of inertia force to gravity force is called: |
| A. | Reynolds number |
| B. | Froude number |
| C. | Mach number |
| D. | Euler number |
| Answer» B. Froude number | |
| 1391. |
Match List-I (Basic Ideal Flow) with List-II (Example) and select the correct answer using the codes given below the lists: List-I (Basic Ideal Flow) List-II (Example) A. Superposition of a uniform flow over a doublet 1. Flow over a half Rankine body B. Superposition of a uniform flow over a source and sink 2. Flow over a Rankine oval C. Superposition of a uniform flow over a source 3. Flow over a rotating body D. Superposition of a free vortex flow along with a uniform flow over a doublet 4. Flow over a stationary body Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| Answer» D. A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 | |
| 1392. |
The drage coefficient for laminar flow varies with Reynolds number (Re) as: |
| A. | \[{{\operatorname{Re}}^{1/2}}\] |
| B. | Re |
| C. | \[{{\operatorname{Re}}^{-1}}\] |
| D. | \[{{\operatorname{Re}}^{-1/2}}\] |
| Answer» E. | |
| 1393. |
A nozzle has velocity head at outlet of 10m. If it is kept vertical the height reached by the stream is: |
| A. | 100 m |
| B. | 10 m |
| C. | \[\sqrt{10}\,m\] |
| D. | \[\frac{1}{\sqrt{10}}\] |
| Answer» C. \[\sqrt{10}\,m\] | |
| 1394. |
A solid P floats with half of its volume immersed in water and solid Q floats with two-thirds of the volume immersed in water. The densities of solider P and Q are in ratio: |
| A. | 1 : 2 |
| B. | 0.04375 |
| C. | 2 : 3 |
| D. | 0.127777777777778 |
| Answer» E. | |
| 1395. |
Which of the following equations are forms of continuity equations? (\[\overrightarrow{V}\]is the velocity and \[\forall \] is volume) 1. \[{{A}_{1}}{{\overrightarrow{V}}_{1}}={{A}_{2}}\overrightarrow{{{V}_{2}}}\] 2. \[1\frac{du}{\partial x}+\frac{dv}{\partial y}=0\] 3. \[\int\limits_{S}{\rho \overrightarrow{V}\,.\,dA+\int\limits_{\forall }{\rho \,d\forall =0}}\] 4. \[\frac{1}{r}\,\,\frac{\partial \,\left( r{{v}_{r}} \right)}{\partial r}+\frac{\partial {{v}_{z}}}{\partial z}=0\] Select the correct answer using the codes below: Codes: |
| A. | 1, 2, 3 and 4 |
| B. | 1 and 2 |
| C. | 3 and 4 |
| D. | 2, 3 and 4 |
| Answer» C. 3 and 4 | |
| 1396. |
Consider the following statements for a two- dimensional potential flow: 1. Laplace equation for stream function must be satisfied. 2. Laplace equation for velocity potential must be satisfied. 3. Stremlines and equipotential lines are mutually perpendicular. 4. Streamlines can intersect each other in very high speed flows. Which of the above statement s are correct? |
| A. | 1 and 4 |
| B. | 2 and 4 |
| C. | 1, 2 and 3 |
| D. | 2, 3 and 4 |
| Answer» D. 2, 3 and 4 | |
| 1397. |
A \[\frac{1}{25}\] model of a ship is to be tested for estimating the wave drag. If the speed of the ship is 1 m/s, then the speed at which the model must be tested is: |
| A. | 0.04 m/s |
| B. | 0.2 m/s |
| C. | 5.0 m/s |
| D. | 25.0 m/s |
| Answer» C. 5.0 m/s | |
| 1398. |
The magnus effect is defined as: |
| A. | The generation of lift per unit drage force |
| B. | The circulation induced in an aircraft wing |
| C. | The separation of boundary layer near the trailing edge of a slender body |
| D. | The generation of lift on a rotating cylinder in a uniform flow. |
| Answer» E. | |
| 1399. |
Aging of pipe implies: |
| A. | Pipe becoming smoother with time |
| B. | Relative roughness decreasing periodically |
| C. | Increase in absolute roughness periodically with time |
| D. | Increase in absolute roughness linearly with time |
| Answer» C. Increase in absolute roughness periodically with time | |
| 1400. |
Consider the following statements: 1. For stream function to exist, the flow should be irrotational. 2. Potential functions are possible even though continuity is not satisfied. 3. Stremlines diverge where the flow is accelerated. 4. Bernoulli's equation will be satisfied for flow across a cross-section. Which of the above statements is/are correct? |
| A. | 1, 2, 3 and 4 |
| B. | 1, 3 and 4 |
| C. | 3 and 4 |
| D. | 2 only |
| Answer» C. 3 and 4 | |