MCQOPTIONS
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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.
| 801. |
The water pressure per metre length on a vertical masonry wall of dam is (where w = Specificweight of the liquid, and H = Height of the liquid) |
| A. | wH/2 |
| B. | wH |
| C. | wH2/2 |
| D. | wH2/4 |
| Answer» D. wH2/4 | |
| 802. |
Constant discharge takes place due to |
| A. | Unit Discharge |
| B. | Unit speed |
| C. | Unit power |
| D. | Unit pressure |
| Answer» C. Unit power | |
| 803. |
What is the unit of steam rate? |
| A. | kg |
| B. | kg/m |
| C. | kg/kWh |
| D. | N/m |
| Answer» D. N/m | |
| 804. |
Which pump is the most efficient centrifugal pump? |
| A. | Electrical pump |
| B. | Reciprocating pump |
| C. | Heat pump |
| D. | Pressure pump View Answer |
| Answer» C. Heat pump | |
| 805. |
What can NPSH be used to determine |
| A. | Friction characteristics |
| B. | Pipe diameter |
| C. | Cavitation |
| D. | Thermal expansion View Answer |
| Answer» D. Thermal expansion View Answer | |
| 806. |
If the slip is above 5 percent, the pumps needs to be |
| A. | Dragged |
| B. | Overhauled |
| C. | Retracted |
| D. | Intermittent View Answer |
| Answer» C. Retracted | |
| 807. |
The distance from pipe boundary, at which the turbulent shear stress isone-third die wall shear stress, is (where R is the radius of pipe.) |
| A. | 1/3 R |
| B. | 1/2 R |
| C. | 2/3 R |
| D. | 3/4R |
| Answer» B. 1/2 R | |
| 808. |
NPSH is the difference between |
| A. | Suction pressure and vapour pressure |
| B. | Vapour pressure and suction pressure |
| C. | Suction pressure and heat |
| D. | Shaft and head View Answer |
| Answer» B. Vapour pressure and suction pressure | |
| 809. |
High specific speed of turbine implies that it is_ |
| A. | Francis turbine |
| B. | Propeller turbine |
| C. | Pelton turbine |
| D. | Kaplan turbine |
| Answer» E. | |
| 810. |
In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» E. | |
| 811. |
In Inward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at outlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» C. Flow ratio | |
| 812. |
In Pelton wheel if angle of deflection is not mentioned then we assume it as_ |
| A. | 150 degrees |
| B. | 200 degrees |
| C. | 165 degrees |
| D. | 185 degrees |
| Answer» D. 185 degrees | |
| 813. |
When bypass valve is opened to |
| A. | Increase Pressure |
| B. | Increase Unit speed |
| C. | Increase Unit power |
| D. | Increase the amount of fresh steam |
| Answer» E. | |
| 814. |
Positive displacement pumps are capable of developing pressures, in suction pressure. |
| A. | High, low |
| B. | Low, high |
| C. | High, high |
| D. | Low, low View Answer |
| Answer» B. Low, high | |
| 815. |
The cylinder of reciprocating cylinder is made up of |
| A. | Cast iron |
| B. | Wrought iron |
| C. | Aluminium |
| D. | Copper View Answer |
| Answer» B. Wrought iron | |
| 816. |
The velocity of the flow through the Kaplan turbine is 25 m/s. The available head of the turbine is 60 m. Find the flow ratio of the turbine (take g = 10 m/s2). |
| A. | 0.65 |
| B. | 0.72 |
| C. | 0.69 |
| D. | 0.75 |
| Answer» C. 0.69 | |
| 817. |
The rate of increase of velocity with respect to change in the position of fluid particle in a flow field is called as |
| A. | local acceleration |
| B. | temporal acceleration |
| C. | convective acceleration |
| D. | all of the above |
| Answer» D. all of the above | |
| 818. |
The working of which of the following hydraulic units is based on Pascal’s law? |
| A. | Air lift pump |
| B. | Hydraulic coupling |
| C. | Hydraulic press |
| D. | Jet pump |
| Answer» D. Jet pump | |
| 819. |
If we reduce the motor rpm in an impeller, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» C. Same | |
| 820. |
In the figure shown below, which of the following type of runners has the bladecurvature as shown in the above figure (The arrow denotes direction of blade motion)? |
| A. | Information insufficient to determine |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» C. Medium Runner | |
| 821. |
If we lower the temperature, the water pump cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» C. Same | |
| 822. |
The equation is general approach is called as central difference. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 823. |
What is the dimension of thermal efficiency of a Kaplan turbine? |
| A. | kg |
| B. | m |
| C. | kg/m |
| D. | Dimensionless |
| Answer» E. | |
| 824. |
Medium specific speed of turbine implies |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» D. Propeller turbine | |
| 825. |
If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is |
| A. | less than 1 |
| B. | between 1 and 100 |
| C. | 160 |
| D. | 200 |
| Answer» D. 200 | |
| 826. |
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area dueto the |
| A. | Force of adhesion |
| B. | Force of cohesion |
| C. | Force of friction |
| D. | Force of diffusion |
| Answer» C. Force of friction | |
| 827. |
Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 828. |
Centrifugal pumps with an internal suction stage are called as |
| A. | Series pumps |
| B. | Self priming pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» C. Froth pumps | |
| 829. |
Jet propulsion of ship in a very shallow water is needed to |
| A. | Avoid sinking of the ship |
| B. | Avoid damage of the propeller |
| C. | Avoid current directions |
| D. | Avoid surface damage |
| Answer» C. Avoid current directions | |
| 830. |
All the characteristic curves are drawn with respect to |
| A. | Unit Discharge |
| B. | Unit speed |
| C. | Unit power |
| D. | Unit pressure |
| Answer» C. Unit power | |
| 831. |
is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | Runner |
| Answer» D. Runner | |
| 832. |
is obtained by dividing total rate of flow through the turbine by rate of flow through single jet. |
| A. | Number of jets |
| B. | Diameter of jets |
| C. | Velocity of jets |
| D. | Speed ratio |
| Answer» B. Diameter of jets | |
| 833. |
Piston pumps are very |
| A. | Expensive |
| B. | Cheap |
| C. | Reasonable |
| D. | Intricate View Answer |
| Answer» B. Cheap | |
| 834. |
The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
| A. | 80 |
| B. | 82.5 |
| C. | 83.3 |
| D. | 85 |
| Answer» D. 85 | |
| 835. |
Priming performs response using |
| A. | Stimulus |
| B. | Froth |
| C. | Slurry |
| D. | Heat View Answer |
| Answer» B. Froth | |
| 836. |
Which of the following instrument can be used for measuring speed of a submarine moving indeep sea? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Hot wire anemometer |
| D. | Pitot tube |
| Answer» E. | |
| 837. |
Turbine that consists of draft tubes is called as_ |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» E. | |
| 838. |
When froth blocks the pump, it leads to |
| A. | Separation of rich minerals |
| B. | Mixing of rich minerals |
| C. | Removing of ores |
| D. | Loss of prime View Answer |
| Answer» E. | |
| 839. |
The energy available at inlet for outward reaction flow turbine is |
| A. | Potential |
| B. | Kinetic energy |
| C. | Pressure energy |
| D. | Pressure energy and Kinetic energy |
| Answer» E. | |
| 840. |
Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet) |
| A. | 15 + D/2d |
| B. | 15 + 3D/2d |
| C. | 15 + D/d |
| D. | 15 + 2D/d |
| Answer» B. 15 + 3D/2d | |
| 841. |
Conical diffuser draft tube is also called |
| A. | Straight divergent tube |
| B. | Simple elbow tube |
| C. | Thermal tube |
| D. | Elbow tube with varying cross section |
| Answer» B. Simple elbow tube | |
| 842. |
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is |
| A. | 400 kg/cm² |
| B. | 4000 kg/cm² |
| C. | 40 × 10⁵ kg/cm² |
| D. | 40 × 10⁶ kg/cm² |
| Answer» C. 40 × 10⁵ kg/cm² | |
| 843. |
A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, whatfraction of it volume is under mercury? |
| A. | The metal piece will simply float over the mercury |
| B. | The metal piece will be immersed in mercury by half |
| C. | Whole of the metal piece will be immersed with its top surface just at mercury level |
| D. | Metal piece will sink to the bottom |
| Answer» D. Metal piece will sink to the bottom | |
| 844. |
Discharge in an outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 845. |
In which of the following the friction drag is generally larger thanpressure drag? |
| A. | a circular disc or plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | an airfoil |
| Answer» E. | |
| 846. |
In Kaplan turbine apparatus, the volume flow rate of water in 15 m3/s at an available head of 55 m (g = 10 m/s2). Find the shaft power (in MW) if the overall efficiency of the turbine is 95%. |
| A. | 78.3 |
| B. | 7.83 |
| C. | 783 |
| D. | 0.783 |
| Answer» C. 783 | |
| 847. |
The lift force acts in _____ to the flow velocity. |
| A. | Perpendicular direction |
| B. | Same direction |
| C. | Opposite direction |
| D. | Different directions |
| Answer» B. Same direction | |
| 848. |
A glass tube of smaller diameter is used while performing an experiment for the capillary rise ofwater 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 | |
| 849. |
consists of stationary circular wheel all around the runner of turbine |
| A. | Casing |
| B. | Guide mechanism |
| C. | Runner |
| D. | Drafting |
| Answer» C. Runner | |
| 850. |
The component of the total force exerted by fluid on a body in the direction parallel to the direction of motion is called as |
| A. | lift |
| B. | drag |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. drag | |