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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.
| 801. |
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as |
| A. | Centre of pressure |
| B. | Centre of gravity |
| C. | Centre of buoyancy |
| D. | Metacentre |
| Answer» E. | |
| 802. |
The flow in a pipe or channel is said to be 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» B. The liquid particles at different sections have different velocities | |
| 803. |
Which place in hydraulic turbine is most susceptible for cavitations? |
| A. | Inlet of draft rube |
| B. | Blade inlet |
| C. | Guide blade |
| D. | Penstock |
| Answer» B. Blade inlet | |
| 804. |
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as |
| A. | Steady flow |
| B. | Turbulent flow |
| C. | Vortex flow |
| D. | Uniform flow |
| Answer» D. Uniform flow | |
| 805. |
The magnitude of water hammer depends upon the |
| A. | Elastic properties of the pipe material |
| B. | Elastic properties of the liquid flowing through the pipe |
| C. | Speed at which the valve is closed |
| D. | All of the above |
| Answer» E. | |
| 806. |
The Reynold's number of a ship is __________ to its velocity and length. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Square root of velocity |
| D. | None of these |
| Answer» B. Inversely proportional | |
| 807. |
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet) |
| A. | Q = π.D.Vf |
| B. | Q = π.b.Vf |
| C. | Q = π.D.bf.V |
| D. | Q = D.b.Vf |
| Answer» D. Q = D.b.Vf | |
| 808. |
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in |
| A. | Neutral equilibrium |
| B. | Stable equilibrium |
| C. | Unstable equilibrium |
| D. | None of these |
| Answer» C. Unstable equilibrium | |
| 809. |
The force present in a moving liquid is |
| A. | Inertia force |
| B. | Viscous force |
| C. | Gravity force |
| D. | All of these |
| Answer» E. | |
| 810. |
The flow of water through the hole in the bottom of a wash basin is an example of |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Free vortex |
| D. | Forced vortex |
| Answer» D. Forced vortex | |
| 811. |
Which of the following is an example of laminar flow? |
| A. | Underground flow |
| B. | Flow past tiny bodies |
| C. | Flow of oil in measuring instruments |
| D. | All of these |
| Answer» E. | |
| 812. |
An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch. |
| A. | 1 % |
| B. | 1.5 % |
| C. | 2 % |
| D. | 2.5 % |
| Answer» E. | |
| 813. |
The velocity at which the laminar flow stops, is known as |
| A. | Velocity of approach |
| B. | Lower critical velocity |
| C. | Higher critical velocity |
| D. | None of these |
| Answer» C. Higher critical velocity | |
| 814. |
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal |
| A. | Ratio of inertial force to force due to viscosity |
| B. | Ratio of inertial force to force due to gravitation |
| C. | Ratio of inertial force to force due to surface tension |
| D. | All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity |
| Answer» E. | |
| 815. |
The speed of a turbine runner is |
| 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» B. Inversely proportional to H1/2 | |
| 816. |
The unit of surface tension is |
| A. | N/m |
| B. | N/m2 |
| C. | N/m3 |
| D. | N-m |
| Answer» B. N/m2 | |
| 817. |
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is$ |
| A. | π w ω² r²/4g |
| B. | π w ω² r³/4g |
| C. | π w ω² r⁴/4g |
| D. | π w ω² r²/2g |
| Answer» B. ≈ì√Ñ w ≈ì√¢¬¨‚⧠r¬¨‚â•/4g | |
| 818. |
The number of buckets on the periphery of a Pelton wheel is given by |
| A. | (D/2d) + 5 |
| B. | (D/2d) + 10 |
| C. | (D/2d) + 15 |
| D. | (D/2d) + 20 |
| Answer» D. (D/2d) + 20 | |
| 819. |
Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between |
| A. | Lift and resultant force |
| B. | Drag and resultant force |
| C. | Lift and tangential force |
| D. | Lift and drag |
| Answer» B. Drag and resultant force | |
| 820. |
The power transmitted through the pipe is maximum when the head lost due to friction is equal to |
| A. | One-fourth of the total supply head |
| B. | One-third of the total supply head |
| C. | One-half of the total supply head |
| D. | Two-third of the total supply head |
| Answer» C. One-half of the total supply head | |
| 821. |
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is |
| A. | Slow speed pump with radial flow at outlet |
| B. | Medium speed pump with radial flow at outlet |
| C. | High speed pump with radial flow at outlet |
| D. | High speed pump with axial flow at outlet |
| Answer» B. Medium speed pump with radial flow at outlet | |
| 822. |
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)$ |
| A. | (1 + cos φ)/2 |
| B. | (1 - cos φ)/2 |
| C. | (1 + sin φ)/2 |
| D. | (1 - sin φ)/2 |
| Answer» B. (1 - cos ≈ì√ú)/2 | |
| 823. |
The specific weight of sea water is __________ that of pure water. |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 824. |
Two pipe systems can be said to be equivalent, when the following quantities are same |
| A. | Friction loss and flow |
| B. | Length and diameter |
| C. | Flow and length |
| D. | Friction factor and diameter |
| Answer» B. Length and diameter | |
| 825. |
The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel. |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» E. | |
| 826. |
Specific speed for reaction turbines ranges from |
| A. | 0 to 4.5 |
| B. | 10 to 100 |
| C. | 80 to 200 |
| D. | 250 to 300 |
| Answer» C. 80 to 200 | |
| 827. |
The rise or depression of liquid in a tube due to surface tension will increase in size of tube will |
| A. | Increase |
| B. | Remain unaffected |
| C. | May increase or decrease depending on the characteristics of liquid |
| D. | Decrease |
| Answer» E. | |
| 828. |
The centre of gravity of the volume of the liquid displaced is called |
| A. | Centre of pressure |
| B. | Centre of buoyancy |
| C. | Metacentre |
| D. | None of these |
| Answer» C. Metacentre | |
| 829. |
A venturi-flume is used to measure |
| A. | Pressure of liquid |
| B. | Discharge of liquid |
| C. | Pressure difference between two points in a channel |
| D. | Pressure difference between two points in a pipe |
| Answer» C. Pressure difference between two points in a channel | |
| 830. |
The discharge through a reaction turbine __________ with the increase in unit speed. |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Increases | |
| 831. |
The velocity of jet of water traveling out of opening in a tank filled with water is proportional to |
| A. | Head of water (h) |
| B. | h² |
| C. | V/T |
| D. | h/2 |
| Answer» D. h/2 | |
| 832. |
Indicator diagram of a reciprocating pump is a graph between |
| A. | Flow vs. swept volume |
| B. | Pressure in cylinder vs. swept volume |
| C. | Flow vs. speed |
| D. | Pressure vs. speed |
| Answer» C. Flow vs. speed | |
| 833. |
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then |
| A. | No flow will take place |
| B. | Cavitation will be formed |
| C. | Efficiency will be low |
| D. | Excessive power will be consumed |
| Answer» C. Efficiency will be low | |
| 834. |
The volumetric change of the fluid caused by a resistance is known as |
| A. | Volumetric strain |
| B. | Volumetric index |
| C. | Compressibility |
| D. | Adhesion |
| Answer» D. Adhesion | |
| 835. |
One stoke is equal to |
| A. | 10-2 m2/s |
| B. | 10-3 m2/s |
| C. | 10-4 m2/s |
| D. | 10-6 m2/s |
| Answer» D. 10-6 m2/s | |
| 836. |
The mass per unit volume of a liquid at a standard temperature and pressure is called |
| A. | Specific weight |
| B. | Mass density |
| C. | Specific gravity |
| D. | None of these |
| Answer» C. Specific gravity | |
| 837. |
The Fourneyron turbine is _________ reaction turbine. |
| A. | An axial flow |
| B. | An inward flow |
| C. | An outward flow |
| D. | A mixed flow |
| Answer» D. A mixed flow | |
| 838. |
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is |
| A. | 0.83 |
| B. | 0.6 |
| C. | 0.4 |
| D. | 0.3 |
| Answer» C. 0.4 | |
| 839. |
According to fan laws, at constant speed and capacity, the pressure and power vary |
| A. | Directly as the air or gas density |
| B. | Inversely as square root of density |
| C. | Inversely as density |
| D. | As square of density |
| Answer» B. Inversely as square root of density | |
| 840. |
Discharge of a centrifugal pump is (where N = Speed of the pump impeller) |
| A. | Directly proportional to N |
| B. | Inversely proportional to N |
| C. | Directly proportional to N² |
| D. | Inversely proportional to N² |
| Answer» B. Inversely proportional to N | |
| 841. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid) |
| A. | wH |
| B. | wH/2 |
| C. | wH2/2 |
| D. | wH2/3 |
| Answer» D. wH2/3 | |
| 842. |
A nozzle placed at the end of a water pipe line discharges water at a |
| A. | Low pressure |
| B. | High pressure |
| C. | Low velocity |
| D. | High velocity |
| Answer» E. | |
| 843. |
If the depth of water in an open channel is greater than the critical depth, the flow is called |
| A. | Critical flow |
| B. | Turbulent flow |
| C. | Tranquil flow |
| D. | Torrential flow |
| Answer» D. Torrential flow | |
| 844. |
The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface) |
| A. | w |
| B. | wh |
| C. | w/h |
| D. | h/w |
| Answer» C. w/h | |
| 845. |
In a Kaplan turbine runner, the numbers of blades are generally between |
| A. | 2 to 4 |
| B. | 4 to 8 |
| C. | 8 to 16 |
| D. | 16 to 24 |
| Answer» C. 8 to 16 | |
| 846. |
The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is |
| A. | [wa (V - v)]/2g |
| B. | [wa (V - v)]/g |
| C. | [wa (V - v)²]/2g |
| D. | [wa (V - v²)]/g |
| Answer» E. | |
| 847. |
The liquid used in manometers should have |
| A. | Low density |
| B. | High density |
| C. | Low surface tension |
| D. | High surface tension |
| Answer» E. | |
| 848. |
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is |
| A. | (V­1 - V2) / V1 |
| B. | (V­1² - V2²) / V1² |
| C. | V1 / (V1 - V2) |
| D. | V1² / (V1² - V2²) |
| Answer» C. V1 / (V1 - V2) | |
| 849. |
In one dimensional flow, the flow |
| A. | Is steady and uniform |
| B. | Takes place in straight line |
| C. | Takes place in curve |
| D. | Takes place in one direction |
| Answer» C. Takes place in curve | |
| 850. |
The force of buoyancy is always __________ the weight of the liquid displaced by the body. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |