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MCQOPTIONS
This section includes 2158 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
Voids are created due to |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Liquid free layers |
| D. | Volumetric layers |
| Answer» D. Volumetric layers | |
| 752. |
The measure of how close the fluid is to the given point is called |
| A. | Flashing |
| B. | Darcy’s factor |
| C. | Transfer temperature |
| D. | Heizenberg’s factor View Answer |
| Answer» B. Darcy’s factor | |
| 753. |
Centrifugal head in Outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 754. |
Specific speed is the speed of the turbine which is similar to its |
| A. | Temperature difference |
| B. | Pressure difference |
| C. | Aspect ratio |
| D. | Speed of rotor |
| Answer» D. Speed of rotor | |
| 755. |
Pelton turbine is operated under |
| A. | Low head and high discharge |
| B. | High head and low discharge |
| C. | Medium head and high discharge |
| D. | Medium head and medium discharge |
| Answer» C. Medium head and high discharge | |
| 756. |
Voids that implode near metal surface develops a |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed |
| Answer» C. Shock waves | |
| 757. |
The velocity imparted by the impeller is converted into |
| A. | Pressure energy |
| B. | Kinetic energy |
| C. | Momentum |
| D. | Potential energy View Answer |
| Answer» B. Kinetic energy | |
| 758. |
What is the typical value for flow ratio in a Francis turbine? |
| A. | 0.05 – 0.1 |
| B. | 0.15 – 0.30 |
| C. | 0.35 – 0.45 |
| D. | 0.50 – 0.60 |
| Answer» C. 0.35 – 0.45 | |
| 759. |
Draft tubes are situated at the outlet in |
| A. | Pelton |
| B. | Reaction |
| C. | Kaplan |
| D. | Francis |
| Answer» B. Reaction | |
| 760. |
Kaplan turbine is needed to improve |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» E. | |
| 761. |
All energy that is transferred from the fluid is derived from |
| A. | Electrical energy |
| B. | Mechanical energy |
| C. | Thermal energy |
| D. | Chemical energy View Answer |
| Answer» C. Thermal energy | |
| 762. |
In a Kaplan Turbine experimental setup, the power output of the shaft is 4.325 MW. The volume flow rate of water in 15 m3/s at an available head of 50 m. Find the overallefficiency of the turbine in % (g = 10 m/s2)? |
| A. | 57.66 |
| B. | 83.63 |
| C. | 81.33 |
| D. | 79.95 |
| Answer» B. 83.63 | |
| 763. |
The shear stress distribution for a fluid flowing in between the parallelplates, both at rest, is |
| A. | constant over the cross section |
| B. | parabolic distribution across the section |
| C. | zero at the mid plane and varies linearly with distance from mid plane |
| D. | zero at plates and increases linearly to midpoint |
| Answer» D. zero at plates and increases linearly to midpoint | |
| 764. |
A flow in which each liquid particle has a definite path, and the paths of individual particles donot cross each other, is called |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Streamline flow |
| D. | Turbulent flow |
| Answer» D. Turbulent flow | |
| 765. |
With the increase in specific speeds, |
| A. | Head race distance increases |
| B. | Tail race distance increases |
| C. | Tank dimensions increases |
| D. | Diameters of impeller increases |
| Answer» E. | |
| 766. |
Kaplan turbine is operated under |
| A. | Low head and high discharge |
| B. | High head and low discharge |
| C. | Medium head and high discharge |
| D. | Medium head and medium discharge |
| Answer» B. High head and low discharge | |
| 767. |
When a cylindrical vessel containing liquid is revolved about its vertical axis at a constantangular velocity, the pressure |
| A. | Varies as the square of the radial distance |
| B. | Increases linearly as its radial distance |
| C. | Increases as the square of the radial distance |
| D. | Decreases as the square of the radial distance |
| Answer» B. Increases linearly as its radial distance | |
| 768. |
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surfacebeing 0.5 m below the water level will be |
| A. | 500 kg |
| B. | 1000 kg |
| C. | 1500 kg |
| D. | 2000 kg |
| Answer» E. | |
| 769. |
Hydraulic turbines are classified based on |
| A. | Energy available at inlet of turbine |
| B. | Direction of flow through vanes |
| C. | Head at inlet of turbine |
| D. | Energy available, Direction of flow, Head at inlet. |
| Answer» E. | |
| 770. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". Thepressure at 2.5 m below the oil surface will be |
| A. | 2 metres of water column |
| B. | 3 metres of water column |
| C. | 3.5 metres of water column |
| D. | 4 m of water column |
| Answer» C. 3.5 metres of water column | |
| 771. |
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy'scoefficient, 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. | |
| 772. |
The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Headlost due to friction in the pipe) |
| A. | (H - hf )/H |
| B. | H/(H - hf ) |
| C. | (H + hf )/H |
| D. | H/(H + hf ) |
| Answer» B. H/(H - hf ) | |
| 773. |
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (onthe upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice) |
| A. | Q = Cd × bH₁ × √(2gh) |
| B. | Q = Cd × bH2 × √(2gh) |
| C. | Q = Cd × b (H2 - H1) × √(2gh) |
| D. | Q = Cd × bH × √(2gh) |
| Answer» D. Q = Cd × bH × √(2gh) | |
| 774. |
The most common application of vertical centrifugal pump is used in |
| A. | Parts washer |
| B. | Mineral industry |
| C. | Paper plating |
| D. | Jukebox View Answer |
| Answer» B. Mineral industry | |
| 775. |
The pipe diameter is ________ |
| A. | Directly proportional to fluid density |
| B. | Directly proportional to mass flow rate |
| C. | Inversely proportional to mass flow rate |
| D. | Directly proportional to fluid velocity View Answer |
| Answer» C. Inversely proportional to mass flow rate | |
| 776. |
Shear stress in static fluid is |
| A. | always zero |
| B. | always maximum |
| C. | between zero to maximum |
| D. | unpredictable |
| Answer» B. always maximum | |
| 777. |
For hydro-dynamically smooth boundary, the friction coefficient forturbulent flow is |
| A. | constant |
| B. | dependent only on Reynolds number |
| C. | a function of Reynolds number and relative roughness |
| D. | dependent on relative roughness only |
| Answer» C. a function of Reynolds number and relative roughness | |
| 778. |
The maximum speed of reciprocating pump is |
| A. | 20m/min |
| B. | 30m/min |
| C. | 40m/min |
| D. | 50m/min View Answer |
| Answer» C. 40m/min | |
| 779. |
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106is approximately equal to |
| A. | 0.1 |
| B. | 0.01 |
| C. | 0.001 |
| D. | 0.0001 |
| Answer» C. 0.001 | |
| 780. |
One dyne is equal to N. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10-5 |
| Answer» E. | |
| 781. |
Nozzles in the Kaplan turbine move due to impact of |
| A. | Water |
| B. | Steam |
| C. | Blade |
| D. | Another nozzle |
| Answer» C. Blade | |
| 782. |
In a reciprocating pump, with the change in discharge pressure, |
| A. | The Volume delivered increases |
| B. | The volume delivered decreases |
| C. | Volume delivered remains the same |
| D. | Volume delivered is independent View Answer |
| Answer» D. Volume delivered is independent View Answer | |
| 783. |
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will befollowing cm of water |
| A. | 51 cm |
| B. | 50 cm |
| C. | 52 cm |
| D. | 52.2 cm |
| Answer» B. 50 cm | |
| 784. |
Component of velocity in direction of jet is -VCosθ. What does ‘θ’ indicate? |
| A. | Angle made by jet |
| B. | Angle made by jet and outlet tip |
| C. | Angle made by jet and inlet tip |
| D. | Tangent angle |
| Answer» D. Tangent angle | |
| 785. |
The whirl velocity at inlet is 15 m/s and blade velocity is 10 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 95% (in MW)? |
| A. | 2.85 |
| B. | 3.075 |
| C. | 6.55 |
| D. | 0.285 |
| Answer» B. 3.075 | |
| 786. |
Hydrodynamic cavitation is due to the process of |
| A. | Vaporisation |
| B. | Sedimentation |
| C. | Filtration |
| D. | Excavation |
| Answer» B. Sedimentation | |
| 787. |
Efficiency of a draft tube gives |
| A. | Temperature difference |
| B. | Pressure difference |
| C. | Kinetic energy difference |
| D. | Density of flow |
| Answer» D. Density of flow | |
| 788. |
SOH in a pump stands for_ |
| A. | Shut Off head |
| B. | Shut off heat |
| C. | Shut off hybrid |
| D. | Set off head View Answer |
| Answer» B. Shut off heat | |
| 789. |
At present which is cheapest means of generating power_ |
| A. | Thermal power |
| B. | Nuclear power |
| C. | Hydroelectric power |
| D. | Electric Power |
| Answer» D. Electric Power | |
| 790. |
Self priming pumps overshadow the function of |
| A. | Self auxiliary device |
| B. | Wear rate |
| C. | Corrosion device |
| D. | Cavitation device View Answer |
| Answer» B. Wear rate | |
| 791. |
Consider an inward flow reaction turbine, here, water |
| A. | Flows parallel to the axis of the wheel |
| B. | Enters the wheel at the outer periphery and then flows towards the centre of the wheel |
| C. | Flow is partly radial and partly axial |
| D. | Enters at the centre of the wheel and then flows towards the outer periphery of the wheel |
| Answer» C. Flow is partly radial and partly axial | |
| 792. |
Pipes of largest diameter which carry water from reservoir to the turbines is known as_ |
| A. | Head stock |
| B. | Tail race |
| C. | Tail stock |
| D. | Pen stock |
| Answer» E. | |
| 793. |
The theoretical value of coefficient of contraction of a sharp edged orificeis |
| A. | 0.611 |
| B. | 0.85 |
| C. | 0.98 |
| D. | 1.00 |
| Answer» B. 0.85 | |
| 794. |
Centrifugal pump works by imparting |
| A. | Potential energy |
| B. | Kinetic energy |
| C. | Heat energy |
| D. | Electrical energy View Answer |
| Answer» C. Heat energy | |
| 795. |
In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 796. |
In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» E. | |
| 797. |
Draft tube operates at |
| A. | Same efficiency |
| B. | Different efficiency |
| C. | Turbine |
| D. | Pump |
| Answer» B. Different efficiency | |
| 798. |
In a Francis turbine, degree of reaction lies between |
| A. | 0 and 1 |
| B. | 1 and 2 |
| C. | 0 and 0.5 |
| D. | 0.5 and 0.1 |
| Answer» B. 1 and 2 | |
| 799. |
During an oscillating jump, the value of Froude lies in between |
| A. | 1 to 2.5 |
| B. | 2.5 to 4.5 |
| C. | Less than 1 |
| D. | Zero |
| Answer» B. 2.5 to 4.5 | |
| 800. |
At each stage the fluid is directed |
| A. | Towards the centre |
| B. | Away the centre |
| C. | Towards the surface |
| D. | Away from the centre View Answer |
| Answer» B. Away the centre | |