MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
_Francis turbine is best suited for$? |
| A. | Medium head application from 24 to 180 m |
| B. | Low head installation up to 30 m |
| C. | High head installation above 180 m |
| D. | All types of heads |
| Answer» B. Low head installation up to 30 m | |
| 602. |
_Euler's dimensionless number relates the following$? |
| A. | Inertial force and gravity |
| B. | Viscous force and inertial force |
| C. | Viscous force and buoyancy force |
| D. | Pressure force and inertial force |
| Answer» E. | |
| 603. |
_A body floats in stable equilibrium$? |
| A. | When its meatcentric height is zero |
| B. | When the metacentre is above e.g. |
| C. | When its e.g. is below its center of buoyancy |
| D. | Metacentre has nothing to do with position of e.g. for determining stability |
| Answer» C. When its e.g. is below its center of buoyancy | |
| 604. |
_The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as$? |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» E. | |
| 605. |
_When the Mach number is between __________ the flow is called super-sonic flow.$? |
| A. | 1 and 2.5 |
| B. | 2.5 and 4 |
| C. | 4 and 6 |
| D. | 1 and 6 |
| Answer» E. | |
| 606. |
_The maximum number of jets generally employed in impulse turbine without jet interference is$? |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 607. |
_The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is$? |
| A. | 200 kg/m3 |
| B. | 400 kg/m3 |
| C. | 600 kg/m3 |
| D. | 800 kg/m3 |
| Answer» E. | |
| 608. |
_The flow rate in gear pump$? |
| A. | Increases with increase in pressure |
| B. | Decreases with increase in pressure |
| C. | More or less remains constant with increase in pressure |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 609. |
_The flow in a pipe is neither laminar nor turbulent when Reynold number is$? |
| A. | Less than 2000 |
| B. | Between 2000 and 2800 |
| C. | More than 2800 |
| D. | None of these |
| Answer» C. More than 2800 | |
| 610. |
_Which of the following is not a reaction turbine?$? |
| A. | Fourneyron turbine |
| B. | Journal turbine |
| C. | Thomson's turbine |
| D. | Pelton wheel |
| Answer» E. | |
| 611. |
_The power developed by a turbine is (where H = Head of water under which the turbine is working)$? |
| A. | Directly proportional to H1/2 |
| B. | Inversely proportional to H1/2 |
| C. | Directly proportional to H3/2 |
| D. | Inversely proportional to H3/2 |
| Answer» D. Inversely proportional to H3/2 | |
| 612. |
_In an immersed body, centre of pressure is$? |
| A. | At the centre of gravity |
| B. | Above the centre of gravity |
| C. | Below be centre of gravity |
| D. | Could be above or below e.g. depending on density of body and liquid |
| Answer» D. Could be above or below e.g. depending on density of body and liquid | |
| 613. |
_When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.$? |
| A. | Sum |
| B. | Difference |
| C. | Arithmetic mean |
| D. | Geometric mean |
| Answer» C. Arithmetic mean | |
| 614. |
_Which of the following manometer has highest sensitivity?$? |
| A. | U-tube with water |
| B. | Inclined U-tube |
| C. | U-tube with mercury |
| D. | Micro-manometer with water |
| Answer» E. | |
| 615. |
_All the terms of energy in Bernoulli's equation have dimension of$? |
| A. | Energy |
| B. | Work |
| C. | Mass |
| D. | Length |
| Answer» E. | |
| 616. |
_When the Mach number is less than unity, the flow is called$? |
| A. | Sub-sonic flow |
| B. | Sonic flow |
| C. | Super-sonic flow |
| D. | Hyper-sonic flow |
| Answer» B. Sonic flow | |
| 617. |
_A flow is called hyper-sonic, if the Mach number is$? |
| A. | Less than unity |
| B. | Unity |
| C. | Between 1 and 6 |
| D. | None of these |
| Answer» E. | |
| 618. |
_The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is$? |
| A. | ρ ω2 r2 |
| B. | 2ρ ω2 r2 |
| C. | ρ ω2 r2/2 |
| D. | ρ ω2 r2/4 |
| Answer» D. ≈ì√Ö ≈ì√¢2 r2/4 | |
| 619. |
_A nozzle is generally made of$? |
| A. | Cylindrical shape |
| B. | Convergent shape |
| C. | Divergent shape |
| D. | Convergent-divergent shape |
| Answer» C. Divergent shape | |
| 620. |
_The conditions for the stable equilibrium of a floating body are$? |
| A. | The metacentre should lie above the center of gravity |
| B. | The center of buoyancy and the center of gravity must lie on the same vertical line |
| C. | A righting couple should be formed |
| D. | All the above are correct |
| Answer» E. | |
| 621. |
_In the case of steady flow of a fluid, the acceleration of any fluid particle is$? |
| A. | Constant |
| B. | Variable |
| C. | Zero |
| D. | Zero under limiting conditions |
| Answer» D. Zero under limiting conditions | |
| 622. |
_The flow in which each liquid particle has a definite path and their paths do not cross each other is called$? |
| A. | One dimensional flow |
| B. | Streamline flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» C. Steady flow | |
| 623. |
_For pipes, laminar flow occurs when Reynolds number is$? |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» B. Between 2000 and 4000 | |
| 624. |
_Center of buoyancy is the$? |
| A. | Centroid of the displaced volume of fluid |
| B. | Center of pressure of displaced volume |
| C. | Does not exist |
| D. | None of the above |
| Answer» B. Center of pressure of displaced volume | |
| 625. |
_With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will$? |
| A. | Decrease |
| B. | Increase |
| C. | Remain unchanged |
| D. | Depend upon the characteristics of liquid |
| Answer» B. Increase | |
| 626. |
_The stability of a dam is checked for$? |
| A. | Tension at the base |
| B. | Overturning of the wall or dam |
| C. | Sliding of the wall or dam |
| D. | All of these |
| Answer» E. | |
| 627. |
_The point at which the resultant pressure on an immersed surface acts, is known as$? |
| A. | Centre of gravity |
| B. | Centre of depth |
| C. | Centre of pressure |
| D. | Centre of immersed surface |
| Answer» D. Centre of immersed surface | |
| 628. |
_A perfect gas$? |
| A. | Has constant viscosity |
| B. | Has zero viscosity |
| C. | Is in compressible |
| D. | None of the above |
| Answer» E. | |
| 629. |
_In a depressed nappe$? |
| A. | The pressure below the nappe is atmospheric |
| B. | The pressure below the nappe is negative |
| C. | The pressure above the nappe is atmospheric |
| D. | The pressure above the nappe is negative |
| Answer» C. The pressure above the nappe is atmospheric | |
| 630. |
_Water is a __________ fluid.$? |
| A. | Real |
| B. | Ideal |
| C. | Newtonian |
| D. | Non-Newtonian |
| Answer» D. Non-Newtonian | |
| 631. |
_The surface tension of mercury at normal temperature is __________ that of water.$? |
| A. | Same as |
| B. | Lower than |
| C. | Higher than |
| D. | None of these |
| Answer» D. None of these | |
| 632. |
_When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as$? |
| A. | Narrow-crested weir |
| B. | Broad-crested weir |
| C. | Ogee weir |
| D. | Submerged weir |
| Answer» E. | |
| 633. |
_A notch is used to measure __________ of liquids.$? |
| A. | Pressure |
| B. | Discharge |
| C. | Velocity |
| D. | Volume |
| Answer» C. Velocity | |
| 634. |
_Geometric similarity is said to exist between the model and the prototype, if both of them$? |
| A. | Have identical velocities |
| B. | Are equal in size and shape |
| C. | Are identical in shape, but differ only in size |
| D. | Have identical forces |
| Answer» D. Have identical forces | |
| 635. |
_Operation of McLeod gauge used for low pressure measurement is based on the principle of$? |
| A. | Gas law |
| B. | Boyle's law |
| C. | Charles law |
| D. | Pascal's law |
| Answer» C. Charles law | |
| 636. |
_Which of the following statement is correct as regard to water wheels?$? |
| A. | They have slow speeds |
| B. | They are suitable even for low water heads |
| C. | They give constant efficiency, even if the discharge is not constant |
| D. | All of the above |
| Answer» E. | |
| 637. |
_The surface tension of mercury at normal temperature compared to that of water is$? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending on size of glass tube |
| Answer» B. Less | |
| 638. |
_In an inward flow reaction turbine$? |
| A. | The water flows parallel to the axis of the wheel |
| B. | The water enters at the center of the wheel and then flows towards the outer periphery of the wheel |
| C. | The water enters the wheel at the outer periphery and then flows towards the center of the wheel |
| D. | The flow of water is partly radial and partly axial |
| Answer» D. The flow of water is partly radial and partly axial | |
| 639. |
_The flow in a pipe or channel is said to be non-uniform when$? |
| A. | The liquid particles at all sections have the same velocities |
| B. | The liquid particles at different sections have different velocities |
| C. | The quantity of liquid flowing per second is constant |
| D. | Each liquid particle has a definite path |
| Answer» C. The quantity of liquid flowing per second is constant | |
| 640. |
_Froude's number is the ratio of inertia force to$? |
| A. | Pressure force |
| B. | Elastic force |
| C. | Gravity force |
| D. | Surface tension force |
| Answer» D. Surface tension force | |
| 641. |
_Which of the following pump is successfully used for lifting water from deep wells?$? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air lift pump |
| Answer» E. | |
| 642. |
_A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used?$? |
| A. | 1 : 5 |
| B. | 1 : 2.5 |
| C. | 1 : 25 |
| D. | 1 : ?5 |
| Answer» B. 1 : 2.5 | |
| 643. |
_Head developed by a centrifugal pump depends on$? |
| A. | Impeller diameter |
| B. | Speed |
| C. | Fluid density |
| D. | Both (A) and (B) above |
| Answer» E. | |
| 644. |
_The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)$? |
| A. | K.ρ |
| B. | K/ρ |
| C. | ρ/K |
| D. | None of these |
| Answer» C. ≈ì√Ö/K | |
| 645. |
_The continuity equation is connected with$? |
| A. | Open channel/pipe flow |
| B. | Compressibility of fluids |
| C. | Conservation of mass |
| D. | Steady/unsteady flow |
| Answer» D. Steady/unsteady flow | |
| 646. |
_The function of guide vanes in a reaction turbine is to$? |
| A. | Allow the water to enter the runner without shock |
| B. | Allow the water to flow over them, without forming eddies |
| C. | Allow the required quantity of water to enter the turbine |
| D. | All of the above |
| Answer» E. | |
| 647. |
_A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?$? |
| A. | 0.5 |
| B. | 0.4 |
| C. | 0.515 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 648. |
_Slip of a reciprocating pump is negative, when$? |
| A. | Suction pipe is short and pump is running at low speeds |
| B. | Delivery pipe is long and pump is running at high speeds |
| C. | Suction pipe is short and delivery pipe is long and the pump is running at low speeds |
| D. | Suction pipe is long and delivery pipe is short and the pump is running at high speeds |
| Answer» E. | |
| 649. |
_Venturimeter is used to$? |
| A. | Measure the velocity of a flowing liquid |
| B. | Measure the pressure of a flowing liquid |
| C. | Measure the discharge of liquid flowing in a pipe |
| D. | Measure the pressure difference of liquid flowing between two points in a pipe line |
| Answer» D. Measure the pressure difference of liquid flowing between two points in a pipe line | |
| 650. |
_The discharge through a channel of rectangular section will be maximum, if$? |
| A. | Its depth is twice the breadth |
| B. | Its breadth is twice the depth |
| C. | Its depth is thrice the breadth |
| D. | Its breadth is thrice the depth |
| Answer» C. Its depth is thrice the breadth | |