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.
| 851. |
The cavitation in reaction turbines is avoided, to a great extent by |
| A. | Installing the turbine below the tail race level |
| B. | Using stainless steel runner of the turbine |
| C. | Providing highly polished blades to the runner |
| D. | All of the above |
| Answer» E. | |
| 852. |
Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | None of these |
| Answer» C. Kaplan turbine | |
| 853. |
When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface. |
| A. | Concave |
| B. | Convex |
| C. | Plane |
| D. | None of these |
| Answer» B. Convex | |
| 854. |
The factional resistance of a pipe varies approximately with __________ of the liquid. |
| A. | Pressure |
| B. | Velocity |
| C. | Square of velocity |
| D. | Cube of velocity |
| Answer» D. Cube of velocity | |
| 855. |
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is |
| A. | (bd²/12) + x̅ |
| B. | (d²/12 x̅) + x̅ |
| C. | b²/12 + x̅ |
| D. | d²/12 + x̅ |
| Answer» C. b¬¨‚â§/12 + x√É√ñ | |
| 856. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency. |
| A. | Hydraulic |
| B. | Mechanical |
| C. | Overall |
| D. | None of these |
| Answer» C. Overall | |
| 857. |
In a centrifugal pump casing, the flow of water leaving the impeller, is |
| A. | Rectilinear flow |
| B. | Radial flow |
| C. | Free vortex motion |
| D. | Forced vortex |
| Answer» D. Forced vortex | |
| 858. |
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is |
| A. | Slow speed with radial flow at outlet |
| B. | Medium speed with radial flow at outlet |
| C. | High speed with radial flow at outlet |
| D. | High speed with mixed flow at outlet |
| Answer» E. | |
| 859. |
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)# |
| A. | 4wd/σ cosα |
| B. | σ cosα/4wd |
| C. | 4σ cosα/wd |
| D. | wd/4σ cosα |
| Answer» D. wd/4≈ì√â cos≈í¬± | |
| 860. |
The specific speed (Ns) of a centrifugal pump is given by |
| A. | (N‚à öQ)/H2/3 |
| B. | (N‚à öQ)/H3/4 |
| C. | (N‚à öQ)/H |
| D. | (N‚à öQ)/H5/4 |
| Answer» C. (N‚Äö√ √∂Q)/H | |
| 861. |
The unit of dynamic viscosity in S.I. units is |
| A. | N-m/s² |
| B. | N-s/m² |
| C. | Poise |
| D. | Stoke |
| Answer» C. Poise | |
| 862. |
Stoke is the unit of |
| A. | Kinematic viscosity in C. G. S. units |
| B. | Kinematic viscosity in M. K. S. units |
| C. | Dynamic viscosity in M. K. S. units |
| D. | Dynamic viscosity in S. I. units |
| Answer» B. Kinematic viscosity in M. K. S. units | |
| 863. |
An air vessel is provided at the summit in a siphon to |
| A. | Avoid interruption in the flow |
| B. | Increase discharge |
| C. | Increase velocity |
| D. | Maintain pressure difference |
| Answer» B. Increase discharge | |
| 864. |
The value of bulk modulus of a fluid is required to determine |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Mach number |
| D. | Euler's number |
| Answer» D. Euler's number | |
| 865. |
Which of the following is dimensionless? |
| A. | Specific weight |
| B. | Specific volume |
| C. | Specific speed |
| D. | Specific gravity |
| Answer» E. | |
| 866. |
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch) |
| A. | (2/3) Cd √ó b √ó ‚à ö(2gH) |
| B. | (2/3) Cd √ó b √ó ‚à ö(2g) √ó H |
| C. | (2/3) Cd √ó b √ó ‚à ö(2g) √ó H3/2 |
| D. | (2/3) Cd √ó b √ó ‚à ö(2g) √ó H2 |
| Answer» D. (2/3) Cd ‚àö√≥ b ‚àö√≥ ‚Äö√ √∂(2g) ‚àö√≥ H2 | |
| 867. |
The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called |
| A. | Surface tension |
| B. | Compressibility |
| C. | Capillarity |
| D. | Viscosity |
| Answer» E. | |
| 868. |
The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is |
| A. | 4.1 sec |
| B. | 5.2 sec |
| C. | 10.4 sec |
| D. | 14.1 sec |
| Answer» D. 14.1 sec | |
| 869. |
The coefficient of discharge for an external mouthpiece depends upon |
| A. | Velocity of liquid |
| B. | Pressure of liquid |
| C. | Area of mouthpiece |
| D. | Length of mouthpiece |
| Answer» E. | |
| 870. |
High specific speed of turbine implies it is |
| A. | Propeller turbine |
| B. | Francis turbine |
| C. | Impulse turbine |
| D. | None of the above |
| Answer» B. Francis turbine | |
| 871. |
Pressure of the order of 10" torr can be measured by |
| A. | Bourdon tube |
| B. | Pirani Gauge |
| C. | Micro-manometer |
| D. | Lonisation gauge |
| Answer» E. | |
| 872. |
A double overhung Pelton wheel has |
| A. | Two jets |
| B. | Two runners |
| C. | Four jets |
| D. | Four runners |
| Answer» C. Four jets | |
| 873. |
A flow in which the quantity of liquid flowing per second is constant, is called __________ flow. |
| A. | Steady |
| B. | Streamline |
| C. | Turbulent |
| D. | Unsteady |
| Answer» B. Streamline | |
| 874. |
When the flow in an open channel is gradually varied, the flow is said to be |
| A. | Steady uniform flow |
| B. | Steady non-uniform flow |
| C. | Unsteady uniform flow |
| D. | Unsteady non-uniform flow |
| Answer» C. Unsteady uniform flow | |
| 875. |
The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid) |
| A. | wH/2 |
| B. | wH |
| C. | wH2/2 |
| D. | wH2/4 |
| Answer» D. wH2/4 | |
| 876. |
The volume of a fluid __________ as the pressure increases. |
| A. | Remains same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 877. |
The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement. |
| A. | The bodies A and B have equal stability |
| B. | The body A is more stable than body B |
| C. | The body B is more stable than body A |
| D. | The bodies A and B are unstable |
| Answer» D. The bodies A and B are unstable | |
| 878. |
Mechanical efficiency of a centrifugal pump is the ratio of |
| A. | Energy available at the impeller to the energy supplied to the pump by the prime mover |
| B. | Actual work-done by the pump to the energy supplied to the pump by the prime mover |
| C. | Energy supplied to the pump to the energy available at the impeller |
| D. | Manometric head to the energy supplied by the impeller per kN of water |
| Answer» B. Actual work-done by the pump to the energy supplied to the pump by the prime mover | |
| 879. |
The total energy line lies over the hydraulic gradient line by an amount equal to the |
| A. | Pressure head |
| B. | Velocity head |
| C. | Pressure head + velocity head |
| D. | Pressure head - velocity head |
| Answer» C. Pressure head + velocity head | |
| 880. |
The total energy of a liquid particle in motion is equal to |
| A. | Pressure energy + kinetic energy + potential energy |
| B. | Pressure energy - (kinetic energy + potential energy) |
| C. | Potential energy - (pressure energy + kinetic energy |
| D. | Kinetic energy - (pressure energy + potential energy) |
| Answer» B. Pressure energy - (kinetic energy + potential energy) | |
| 881. |
Francis, Kaplan and propeller turbines fall under the category of |
| A. | Impulse turbines |
| B. | Reaction turbines |
| C. | Axial flow turbines |
| D. | Mixed flow turbines |
| Answer» C. Axial flow turbines | |
| 882. |
A structure used to dam up a stream or river over which the water flows is called |
| A. | Orifice |
| B. | Notch |
| C. | Weir |
| D. | Dam |
| Answer» D. Dam | |
| 883. |
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity) |
| A. | tanθ = a/g |
| B. | tanθ = 2 a/g |
| C. | tanθ = a/2g |
| D. | tanθ = a2/2g |
| Answer» B. tan≈í‚àè = 2 a/g | |
| 884. |
Which type of the pump is different from others in the same group? |
| A. | Screw pump |
| B. | Gear pump |
| C. | Cam and piston pump |
| D. | Plunger pump |
| Answer» E. | |
| 885. |
A hydraulic intensifier normally consists of |
| A. | Two cylinders, two rams and a storage device |
| B. | A cylinder and a ram |
| C. | Two coaxial rams and two cylinders |
| D. | A cylinder, a piston, storage tank and control valve |
| Answer» D. A cylinder, a piston, storage tank and control valve | |
| 886. |
A flow through a long pipe at constant rate is called |
| A. | Steady uniform flow |
| B. | Steady non-uniform flow |
| C. | Unsteady uniform flow |
| D. | Unsteady non-uniform flow |
| Answer» B. Steady non-uniform flow | |
| 887. |
The static head of a centrifugal pump is equal to the _________ of suction head and delivery head. |
| A. | Product |
| B. | Difference |
| C. | Sum |
| D. | None of these |
| Answer» D. None of these | |
| 888. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by |
| A. | dQ/Q = 3/2 √ó (dH/H) |
| B. | dQ/Q = 2 √ó (dH/H) |
| C. | dQ/Q = 5/2 √ó (dH/H) |
| D. | dQ/Q = 3 √ó (dH/H) |
| Answer» D. dQ/Q = 3 ‚àö√≥ (dH/H) | |
| 889. |
The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger) |
| A. | (W/p) √ó (A/a) |
| B. | (p/W) √ó (a/A) |
| C. | (W/p) √ó (a/A) |
| D. | (p/W) √ó (A/a) |
| Answer» D. (p/W) ‚àö√≥ (A/a) | |
| 890. |
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be |
| A. | 2A √ó ‚à öH‚ÇÅ/Cd √ó a √ó ‚à ö(2g) |
| B. | 2A √ó ‚à öH‚ÇÇ/Cd √ó a √ó ‚à ö(2g) |
| C. | 2A √ó (‚à öH‚ÇÅ - ‚à öH‚ÇÇ)/Cd √ó a √ó ‚à ö(2g) |
| D. | 2A √ó (‚à öH3/2 - ‚à öH3/2)/Cd √ó a √ó ‚à ö(2g) |
| Answer» D. 2A ‚àö√≥ (‚Äö√ √∂H3/2 - ‚Äö√ √∂H3/2)/Cd ‚àö√≥ a ‚àö√≥ ‚Äö√ √∂(2g) | |
| 891. |
Meta-centric height is given as the distance between |
| A. | The center of gravity of the body and the metacenter |
| B. | The center of gravity of the body and the center of buoyancy |
| C. | The center of gravity of the body and the center of pressure |
| D. | Center of buoyancy and metacenter |
| Answer» B. The center of gravity of the body and the center of buoyancy | |
| 892. |
The buoyancy depends upon the |
| A. | Weight of the liquid displaced |
| B. | Pressure with which the liquid is displaced |
| C. | Viscosity of the liquid |
| D. | Compressibility of the liquid |
| Answer» B. Pressure with which the liquid is displaced | |
| 893. |
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is |
| A. | 0.46 |
| B. | 0.64 |
| C. | 0.78 |
| D. | 0.87 |
| Answer» C. 0.78 | |
| 894. |
Which of the following turbine is preferred for 0 to 25 m head of water? |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | None of these |
| Answer» C. Francis turbine | |
| 895. |
A hydraulic press is a device used |
| A. | To store pressure energy which may be supplied to a machine later on |
| B. | To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure |
| C. | To lift larger load by the application of a comparatively much smaller force |
| D. | All of the above |
| Answer» D. All of the above | |
| 896. |
Power required to drive a centrifugal pump is directly proportional to _________ of its impeller. |
| A. | Diameter |
| B. | Square of diameter |
| C. | Cube of diameter |
| D. | Fourth power of diameter |
| Answer» E. | |
| 897. |
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because |
| A. | It is easier to see through the glass tube |
| B. | Glass tube is cheaper than a metallic tube |
| C. | It is not possible to conduct this experiment with any other tube |
| D. | All of the above |
| Answer» B. Glass tube is cheaper than a metallic tube | |
| 898. |
The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch. |
| A. | Plus |
| B. | Minus |
| C. | Divide |
| D. | None of these |
| Answer» B. Minus | |
| 899. |
The shear stress-strain graph for a Newtonian fluid is a |
| A. | Straight line |
| B. | Parabolic curve |
| C. | Hyperbolic curve |
| D. | Elliptical |
| Answer» B. Parabolic curve | |
| 900. |
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» B. More than | |