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.
| 701. |
A linear wheel turning motion is called as a |
| A. | Reciprocation |
| B. | Rotation |
| C. | Oscillation |
| D. | Bicycle pump View Answer |
| Answer» C. Oscillation | |
| 702. |
Inner radial flow extracts energy from |
| A. | Turbine blades |
| B. | Moving fluid |
| C. | Pressure change |
| D. | Temperature increase |
| Answer» C. Pressure change | |
| 703. |
How does the flow ratio (ψ) of a Francis turbine vary with available head (H)? |
| A. | ψ α H |
| B. | ψ α 1/H |
| C. | ψ α sqrt (H) |
| D. | ψ α 1/(sqrt (H)) |
| Answer» E. | |
| 704. |
The change of angular momentum in a pump is equal to the |
| A. | Sum of speeds |
| B. | Sum of individual momentum |
| C. | Sum of temperatures |
| D. | Sum of energy transferred from a body View Answer |
| Answer» C. Sum of temperatures | |
| 705. |
In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)? |
| A. | Vf1 / Vw1 |
| B. | Vr1 / Vw1 |
| C. | Vr1 / u1 |
| D. | Vw1 / u1 |
| Answer» E. | |
| 706. |
Constant speed curves are also called as |
| A. | Main characteristic curves |
| B. | Turbine curves |
| C. | Tail race curves |
| D. | Impeller curves |
| Answer» D. Impeller curves | |
| 707. |
If a vessel containing liquid moves downward with a constant accelerationequal to ‘g’ then |
| A. | the pressure throughout the liquid mass is atmospheric |
| B. | there will be vacuum in the liquid |
| C. | the pressure in the liquid mass is greater than hydrostatic pressure |
| D. | none of the above |
| Answer» B. there will be vacuum in the liquid | |
| 708. |
Discharge in outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 709. |
When we arrange turbine blades in multiple stages it is called |
| A. | Pressure change |
| B. | Vane deviation |
| C. | Compounding |
| D. | Pressure ratio |
| Answer» D. Pressure ratio | |
| 710. |
What is the dimension for Darcy’s friction factor? |
| A. | kg/m |
| B. | N/mm |
| C. | kg |
| D. | Dimensionless View Answer |
| Answer» E. | |
| 711. |
The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l =Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid) |
| A. | 4μvl/wd² |
| B. | 8μvl/wd² |
| C. | 16μvl/wd² |
| D. | 32μvl/wd² |
| Answer» E. | |
| 712. |
When the balancing of the turbine is disturbed, we use |
| A. | Throttle governing |
| B. | Steam governing |
| C. | Nozzle governing |
| D. | Emergency governing |
| Answer» E. | |
| 713. |
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shapeof |
| A. | A triangle |
| B. | A paraboloid |
| C. | An ellipse |
| D. | None of these |
| Answer» C. An ellipse | |
| 714. |
When we change the pump, the cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» C. Same | |
| 715. |
The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)? |
| A. | 65 |
| B. | 75 |
| C. | 80 |
| D. | 90 |
| Answer» D. 90 | |
| 716. |
Reciprocating pumps are classified according to |
| A. | Drag force |
| B. | Number of cylinders |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» C. Shock waves | |
| 717. |
What is the name of the equation?Q = (πΔPr4) / (8μL) |
| A. | Darcey equation |
| B. | Poiseuille law |
| C. | Reynolds equation |
| D. | Sherwood law |
| Answer» C. Reynolds equation | |
| 718. |
The fluid coming into the centrifugal pump is accelerated by |
| A. | Throttle |
| B. | Impeller |
| C. | Nozzle |
| D. | Governor View Answer |
| Answer» C. Nozzle | |
| 719. |
In reaction turbine hydraulic efficiency is_ |
| A. | Ratio of actual work at the turbine to the energy imparted to the wheel. |
| B. | Ratio of work done on the wheel to energy that is supplied to the turbine. |
| C. | Ratio of power produced by the turbine to the energy actually supplied by the turbine. |
| D. | Ratio of Work done on the wheel to the energy (or head of water) actually supplied to the turbine. |
| Answer» C. Ratio of power produced by the turbine to the energy actually supplied by the turbine. | |
| 720. |
The velocities of the blade angles can be found out using |
| A. | Mach number |
| B. | Froude’s number |
| C. | Velocity triangles |
| D. | Reynolds number |
| Answer» D. Reynolds number | |
| 721. |
Tendency of wheel to race is predominant in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» C. Impulse turbine | |
| 722. |
Kinematic eddy viscosity (ε) is the ratio of |
| A. | eddy viscosity (η) to dynamic viscosity (μ) |
| B. | eddy viscosity (η) to kinematic viscosity (ν) |
| C. | kinematic viscosity to eddy viscosity (η) |
| D. | eddy viscosity (η) to mass density (ρ) |
| Answer» E. | |
| 723. |
The rotational kinetic energy comes from |
| A. | Engine motor |
| B. | Pump |
| C. | Tank |
| D. | Draft tube View Answer |
| Answer» B. Pump | |
| 724. |
The efficiency of the draft tube depends on the |
| A. | Heat |
| B. | Pressure |
| C. | Temperature |
| D. | Pressure and temperature |
| Answer» E. | |
| 725. |
In impulse turbines with moving blades, there is no in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» B. Same pressure | |
| 726. |
Centrifugal pumps are located the level of source |
| A. | Below |
| B. | Above |
| C. | Parallel with |
| D. | Series with View Answer |
| Answer» B. Above | |
| 727. |
The flow in which the velocity vector is identical in magnitude and direction at every point, forany given instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» C. Steady flow | |
| 728. |
In a Sutro weir, the discharge is proportional to (where H is head.) |
| A. | H1/2 |
| B. | H3/2 |
| C. | H5/2 |
| D. | H |
| Answer» E. | |
| 729. |
When the pressure intensity at a point is more than the local atmospheric pressure, then thedifference of these two pressures is called |
| A. | Gauge pressure |
| B. | Absolute pressure |
| C. | Positive gauge pressure |
| D. | Vacuum pressure |
| Answer» D. Vacuum pressure | |
| 730. |
When the hydraulic fluid forms on only one side of the piston, it is called |
| A. | Single acting pump |
| B. | Double acting pump |
| C. | Froth pump |
| D. | Draft tube View Answer |
| Answer» B. Double acting pump | |
| 731. |
The centrifugal pump has varying flow depending on the |
| A. | Pressure |
| B. | Static lift |
| C. | Volume |
| D. | Flow rate View Answer |
| Answer» B. Static lift | |
| 732. |
The water from penstocks enters the which is spiral in shape which the area of cross section of casing goes on decreasing gradually |
| A. | guide wheel |
| B. | draft tube |
| C. | casing |
| D. | runner |
| Answer» D. runner | |
| 733. |
The available head of a Francis Turbine is 100 m. Velocity of the flow at the runner inlet is 15 m/s. Find the flow ratio. |
| A. | 0.33 |
| B. | 0.45 |
| C. | 0.67 |
| D. | 0.89 |
| Answer» B. 0.45 | |
| 734. |
What does PSP stand for? |
| A. | Pump start procedure |
| B. | Positive start pump |
| C. | Pump start pointer |
| D. | Positive start pointer View Answer |
| Answer» B. Positive start pump | |
| 735. |
The friction factor in fluid flowing through pipe depends upon |
| A. | Reynold’s number |
| B. | relative roughness of pipe surface |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 736. |
Corrosion in the pump is developed due to |
| A. | Pressure of air |
| B. | Fluid properties |
| C. | Draft tube |
| D. | Tank dimensions View Answer |
| Answer» C. Draft tube | |
| 737. |
If we use two lower capacity pumps in parallel, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» C. Same | |
| 738. |
In impulse turbines with stationary blades, there is in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» B. Same pressure | |
| 739. |
What is purpose of froth in froth pumps? |
| A. | Separates rich minerals |
| B. | Mixes rich minerals |
| C. | Removes ores |
| D. | Detects oil View Answer |
| Answer» B. Mixes rich minerals | |
| 740. |
The consequence of Newtons second law is |
| A. | Conservation of angular momentum |
| B. | Conservation of mass |
| C. | Conservation of potential energy |
| D. | Conservation of kinetic energy View Answer |
| Answer» B. Conservation of mass | |
| 741. |
Flow at constant rate through a tapering pipe isi) steady flow ii) uniform flow iii) unsteady flow iv) non-uniform flow The correct answer is |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 742. |
The flow rate of steam is controlled by regulating the |
| A. | Steam |
| B. | Pressure |
| C. | Temperature |
| D. | Speed |
| Answer» C. Temperature | |
| 743. |
The higher discharge valve line holds the discharge valve |
| A. | Open |
| B. | Closed |
| C. | Stop functioning |
| D. | Automatic View Answer |
| Answer» C. Stop functioning | |
| 744. |
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter atthroat to the diameter of pipe should be |
| A. | 1/16 to 1/8 |
| B. | 1/8 to 1/4 |
| C. | 1/4 to 1/3 |
| D. | 1/3 to 1/2 |
| Answer» E. | |
| 745. |
The tube at the exit of the nozzle increases the |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Density of flow |
| Answer» C. Volume of the flow | |
| 746. |
The most common pump used for hydraulic fluid power application is |
| A. | Centrifugal pumps |
| B. | Gear pump |
| C. | Froth pumps |
| D. | Airlift pumps View Answer |
| Answer» C. Froth pumps | |
| 747. |
A multistage centrifugal pumps has more than two |
| A. | Pumps |
| B. | Impellers |
| C. | Turbines |
| D. | Magnetic pumps View Answer |
| Answer» C. Turbines | |
| 748. |
Force exerted by a jet on a moving plate happens in how many cases? |
| A. | 3 cases |
| B. | 2 cases |
| C. | 1 case |
| D. | Nil |
| Answer» B. 2 cases | |
| 749. |
Which of the following efficiencies for Francis Turbine is described as the ratio betweenthe power produced by runner to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 750. |
A tank that is used to protect closed water heating systems is called |
| A. | Pressure vessel |
| B. | Expansion vessel |
| C. | Heat vessel |
| D. | Auto vessel View Answer |
| Answer» C. Heat vessel | |