MCQOPTIONS
Saved Bookmarks
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.
| 701. |
The discharge over a rectangular notch is$? |
| A. | Inversely proportional to H3/2 |
| B. | Directly proportional to H3/2 |
| C. | Inversely proportional to H5/2 |
| D. | Directly proportional to H5/2 |
| Answer» C. Inversely proportional to H5/2 | |
| 702. |
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)$? |
| A. | 2gH |
| B. | H √ó ‚à ö(2g) |
| C. | 2g √ó ‚à öH |
| D. | ‚à ö(2gh) |
| Answer» E. | |
| 703. |
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is$? |
| A. | 0.417 H5/2 |
| B. | 1.417 H5/2 |
| C. | 4.171 H5/2 |
| D. | 7.141 H5/2 |
| Answer» C. 4.171 H5/2 | |
| 704. |
The Newton's law of resistance is based on the assumption that the$? |
| A. | Planes of the body are completely smooth |
| B. | Space around the body is completely filled with the fluid |
| C. | Fluid particles do not exert any influence on one another |
| D. | All of the above |
| Answer» E. | |
| 705. |
Resultant pressure of the liquid in the case of an immersed body acts through$? |
| A. | Centre of gravity |
| B. | Centre of pressure |
| C. | Metacentre |
| D. | Centre of buoyancy |
| Answer» C. Metacentre | |
| 706. |
The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race.$? |
| A. | Sum |
| B. | Difference |
| C. | Product |
| D. | None of these |
| Answer» C. Product | |
| 707. |
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)$? |
| A. | (2/3) Cd √ó L.‚à ö2g [H1 - Ha] |
| B. | (2/3) Cd √ó L. ‚à ö2g [H13/2 - Ha3/2] |
| C. | (2/3) Cd √ó L.‚à ö2g [H12 - Ha2] |
| D. | (2/3) Cd √ó L. ‚à ö2g [H15/2 - Ha5/2] |
| Answer» C. (2/3) Cd ‚àö√≥ L.‚Äö√ √∂2g [H12 - Ha2] | |
| 708. |
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be$? |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Could be any value |
| Answer» E. | |
| 709. |
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called$? |
| A. | Pascal’s law |
| B. | Archimedes’s principle |
| C. | Principle of flotation |
| D. | Bernoulli’s theorem |
| Answer» C. Principle of flotation | |
| 710. |
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if$? |
| A. | Length of both the pipes is same |
| B. | Diameter of both the pipes is same |
| C. | Loss of head and discharge of both the pipes is same |
| D. | Loss of head and velocity of flow in both the pipes is same |
| Answer» D. Loss of head and velocity of flow in both the pipes is same | |
| 711. |
For centrifugal pump impeller, the maximum value of the vane exit angle is$? |
| A. | 10° to 15° |
| B. | 15° to 20° |
| C. | 20° to 25° |
| D. | 25° to 30° |
| Answer» D. 25¬¨‚àû to 30¬¨‚àû | |
| 712. |
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called$? |
| A. | Adhesion |
| B. | Cohesion |
| C. | Viscosity |
| D. | Compressibility |
| Answer» B. Cohesion | |
| 713. |
In a Francis turbine runner, the numbers of blades are generally between$? |
| A. | 2 to 4 |
| B. | 4 to 8 |
| C. | 8 to 16 |
| D. | 16 to 24 |
| Answer» E. | |
| 714. |
The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.$? |
| A. | Equal |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 715. |
Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?$? |
| A. | Hydraulic ram |
| B. | Hydraulic intensifier |
| C. | Hydraulic torque converter |
| D. | Hydraulic accumulator |
| Answer» D. Hydraulic accumulator | |
| 716. |
Two dimensional flows occurs when$? |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» E. | |
| 717. |
The two important forces for a floating body are$? |
| A. | Buoyancy, gravity |
| B. | Buoyancy, pressure |
| C. | Buoyancy, inertial |
| D. | Inertial, gravity |
| Answer» B. Buoyancy, pressure | |
| 718. |
Mercury does not wet glass. This is due to property of liquid known as$? |
| A. | Adhesion |
| B. | Cohesion |
| C. | Surface tension |
| D. | Viscosity |
| Answer» D. Viscosity | |
| 719. |
The purpose of a surge tank is$? |
| A. | To control the pressure variations due to rapid changes in the pipe line flow |
| B. | To eliminate water hammer possibilities |
| C. | To regulate flow of water to turbines by providing necessary retarding head of water |
| D. | All of the above |
| Answer» E. | |
| 720. |
The stress-strain relation of the Newtonian fluid is$? |
| A. | Linear |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Inverse type |
| Answer» B. Parabolic | |
| 721. |
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are$? |
| A. | Less |
| B. | More |
| C. | Equal |
| D. | Less at low temperature and more at high temperature |
| Answer» C. Equal | |
| 722. |
If ‘w’ is the specific weight of liquid and ‘k’ the depth of any point from the surface, then pressure intensity at that point will be$? |
| A. | h |
| B. | wh |
| C. | w/h |
| D. | h/w |
| Answer» C. w/h | |
| 723. |
When the Mach number is more than 6, the flow is called$? |
| A. | Sub-sonic flow |
| B. | Sonic flow |
| C. | Super-sonic flow |
| D. | Hyper-sonic flow |
| Answer» E. | |
| 724. |
For hypersonic flow, the Mach number is$? |
| A. | Unity |
| B. | Greater than unity |
| C. | Greater than 2 |
| D. | Greater than 4 |
| Answer» E. | |
| 725. |
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is$? |
| A. | 0.26 |
| B. | 0.36 |
| C. | 0.46 |
| D. | 0.56 |
| Answer» D. 0.56 | |
| 726. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by$? |
| A. | dQ/Q = (1/2) √ó (dH/H) |
| B. | dQ/Q = (3/4) √ó (dH/H) |
| C. | dQ/Q = (dH/H) |
| D. | dQ/Q = (3/2) √ó (dH/H) |
| Answer» E. | |
| 727. |
The flow which neglects changes in a transverse direction is known as? |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» B. Uniform flow | |
| 728. |
The discharge in an open channel corresponding to critical depth is? |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of these |
| Answer» D. None of these | |
| 729. |
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is? |
| A. | 10 r.p.m. |
| B. | 20 r.p.m. |
| C. | 40 r.p.m. |
| D. | 80 r.p.m. |
| Answer» C. 40 r.p.m. | |
| 730. |
The maximum discharge over a broad crested weir is? |
| A. | 0.384 Cd √ó L √ó H1/2 |
| B. | 0.384 Cd √ó L √ó H3/2 |
| C. | 1.71 Cd √ó L √ó H1/2 |
| D. | 1.71 Cd √ó L √ó H3/2 |
| Answer» E. | |
| 731. |
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)? |
| A. | flv²/2gd |
| B. | flv²/gd |
| C. | 3flv²/2gd |
| D. | 4flv²/2gd |
| Answer» E. | |
| 732. |
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called? |
| A. | Pascal’s law |
| B. | Archimedes’s principle |
| C. | Principle of flotation |
| D. | Bernoulli’s theorem |
| Answer» C. Principle of flotation | |
| 733. |
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be? |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Could be any value |
| Answer» E. | |
| 734. |
For centrifugal pump impeller, the maximum value of the vane exit angle is? |
| A. | 10° to 15° |
| B. | 15° to 20° |
| C. | 20° to 25° |
| D. | 25° to 30° |
| Answer» D. 25¬¨‚àû to 30¬¨‚àû | |
| 735. |
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)? |
| A. | (2/3) Cd √ó L.‚à ö2g [H1 - Ha] |
| B. | (2/3) Cd √ó L. ‚à ö2g [H13/2 - Ha3/2] |
| C. | (2/3) Cd √ó L.‚à ö2g [H12 - Ha2] |
| D. | (2/3) Cd √ó L. ‚à ö2g [H15/2 - Ha5/2] |
| Answer» C. (2/3) Cd ‚àö√≥ L.‚Äö√ √∂2g [H12 - Ha2] | |
| 736. |
The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race.? |
| A. | Sum |
| B. | Difference |
| C. | Product |
| D. | None of these |
| Answer» C. Product | |
| 737. |
Resultant pressure of the liquid in the case of an immersed body acts through? |
| A. | Centre of gravity |
| B. | Centre of pressure |
| C. | Metacentre |
| D. | Centre of buoyancy |
| Answer» C. Metacentre | |
| 738. |
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if? |
| A. | Length of both the pipes is same |
| B. | Diameter of both the pipes is same |
| C. | Loss of head and discharge of both the pipes is same |
| D. | Loss of head and velocity of flow in both the pipes is same |
| Answer» D. Loss of head and velocity of flow in both the pipes is same | |
| 739. |
Casting of a centrifugal pump is designed so as to minimize? |
| A. | Friction loss |
| B. | Cavitations |
| C. | Static head |
| D. | Loss of kinetic energy |
| Answer» E. | |
| 740. |
A square surface 3 m √ó 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is? |
| A. | 9,000 kg |
| B. | 13,500 kg |
| C. | 18,000 kg |
| D. | 27,000 kg |
| Answer» C. 18,000 kg | |
| 741. |
The critical depth meter is used to measure? |
| A. | Velocity of flow in an open channel |
| B. | Depth of flow in an open channel |
| C. | Hydraulic jump |
| D. | Depth of channel |
| Answer» D. Depth of channel | |
| 742. |
Poise is the unit of? |
| A. | Surface tension |
| B. | Capillarity |
| C. | Viscosity |
| D. | Shear stress in fluids |
| Answer» D. Shear stress in fluids | |
| 743. |
The loss of pressure head in case of laminar flow is proportional to? |
| A. | Velocity |
| B. | (Velocity)2 |
| C. | (Velocity)3 |
| D. | (Velocity)4 |
| Answer» B. (Velocity)2 | |
| 744. |
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be? |
| A. | 500 kg |
| B. | 1000 kg |
| C. | 1500 kg |
| D. | 2000 kg |
| Answer» E. | |
| 745. |
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)? |
| A. | 2gH |
| B. | H √ó ‚à ö(2g) |
| C. | 2g √ó ‚à öH |
| D. | ‚à ö(2gh) |
| Answer» E. | |
| 746. |
The discharge over a rectangular notch is? |
| A. | Inversely proportional to H3/2 |
| B. | Directly proportional to H3/2 |
| C. | Inversely proportional to H5/2 |
| D. | Directly proportional to H5/2 |
| Answer» C. Inversely proportional to H5/2 | |
| 747. |
The Newton's law of resistance is based on the assumption that the? |
| A. | Planes of the body are completely smooth |
| B. | Space around the body is completely filled with the fluid |
| C. | Fluid particles do not exert any influence on one another |
| D. | All of the above |
| Answer» E. | |
| 748. |
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is? |
| A. | 0.417 H5/2 |
| B. | 1.417 H5/2 |
| C. | 4.171 H5/2 |
| D. | 7.141 H5/2 |
| Answer» C. 4.171 H5/2 | |
| 749. |
The hydraulic mean depth or the hydraulic radius is the ratio of? |
| A. | Area of flow and wetted perimeter |
| B. | Wetted perimeter and diameter of pipe |
| C. | Velocity of flow and area of flow |
| D. | None of these |
| Answer» B. Wetted perimeter and diameter of pipe | |
| 750. |
In reaction turbine, draft tube is used? |
| A. | To transport water downstream without eddies |
| B. | To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section |
| C. | For safety of turbine |
| D. | To increase flow rate |
| Answer» C. For safety of turbine | |