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.
| 601. |
Impulse turbine is generally fitted at |
| A. | At the level of tail race |
| B. | Above the tail race |
| C. | Below the tail race |
| D. | About 2.5mts above tail race to avoid cavitations. |
| Answer» C. Below the tail race | |
| 602. |
Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» E. | |
| 603. |
Which type of turbine is used to change the velocity of the water through its flow? |
| A. | Kinetic turbines |
| B. | Axial flow turbines |
| C. | Impulse turbines |
| D. | Reaction turbines |
| Answer» D. Reaction turbines | |
| 604. |
‘Ht’ means |
| A. | Tangential head |
| B. | Horizontally head |
| C. | Theory head pressure |
| D. | Radially head pressure View Answer |
| Answer» D. Radially head pressure View Answer | |
| 605. |
Centrifugal pump is a |
| A. | Turbomachinery |
| B. | Flow regulating device |
| C. | Drafting device |
| D. | Intercooling device View Answer |
| Answer» B. Flow regulating device | |
| 606. |
A flow in which the volume of a fluid and its density does not change during the flow is called_________ flow. |
| A. | Incompressible |
| B. | Compressible |
| C. | Viscous |
| D. | None of these |
| Answer» B. Compressible | |
| 607. |
is a circular wheel on which a series of smooth, radial curved vanes are fixed. |
| A. | Guide wheel |
| B. | Runner |
| C. | Casing |
| D. | Draft tube |
| Answer» C. Casing | |
| 608. |
Kaplan turbine works on |
| A. | Electrical energy |
| B. | Hydro energy |
| C. | Thermal energy |
| D. | Chemical energy |
| Answer» D. Chemical energy | |
| 609. |
Overall efficiency vs what is drawn to determine the turbine performance? |
| A. | Unit Discharge |
| B. | Unit speed |
| C. | Unit power |
| D. | Unit pressure |
| Answer» C. Unit power | |
| 610. |
The increase in meta centric heighti) increases stability ii) decreases stability iii) increases comfort for passengers iv) decreases comfort for passengers The correct answer is |
| A. | (i) and (iii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 611. |
If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, thenthe kinematic viscosity of that fluid in stokes is |
| A. | 0.25 |
| B. | 0.50 |
| C. | 1.0 |
| D. | none of the above |
| Answer» D. none of the above | |
| 612. |
The process of bubble generation leads to |
| A. | High temperatures |
| B. | High pressures |
| C. | High energy densities |
| D. | High volumetric ratio View Answer |
| Answer» D. High volumetric ratio View Answer | |
| 613. |
and of radial flow reaction turbine are always full of water. |
| A. | Casing and runner |
| B. | Casing and penstocks |
| C. | Runner and penstocks |
| D. | Runner and draft tube |
| Answer» B. Casing and penstocks | |
| 614. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The totalpressure 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 | |
| 615. |
Specific speed is used to characterize |
| A. | Turbomachinery speed |
| B. | Flow speed |
| C. | Energy flow |
| D. | Heat generated |
| Answer» B. Flow speed | |
| 616. |
Positive displacement pumps regulate the flow by varying its |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» E. | |
| 617. |
What is the unit of specific speed in metric system? |
| A. | m.s |
| B. | m/s |
| C. | m3/s |
| D. | m |
| Answer» D. m | |
| 618. |
allow the water to strike the vanes fixed on runner without shock at inlet |
| A. | Casing |
| B. | Guide vanes |
| C. | Runner |
| D. | Draft tube |
| Answer» C. Runner | |
| 619. |
In an outward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» B. Decreases | |
| 620. |
Priming is needed when impeller cannot impart enough |
| A. | Draft speed |
| B. | Energy |
| C. | Pressure |
| D. | Heat View Answer |
| Answer» C. Pressure | |
| 621. |
Plotting sine curve will take place along the |
| A. | y axis |
| B. | x axis |
| C. | z axis |
| D. | x and z |
| Answer» C. z axis | |
| 622. |
In the figure shown below,which of the following angles replace the question mark? |
| A. | Guide vane angle at inlet |
| B. | Blade angle at inlet |
| C. | Vane angle at inlet |
| D. | Blade angle at outlet |
| Answer» B. Blade angle at inlet | |
| 623. |
The main function of nozzle is to |
| A. | Varying temperatures |
| B. | Pressure variations |
| C. | Load variations |
| D. | Heat variations View Answer |
| Answer» C. Load variations | |
| 624. |
The Pelton wheel extracts energy from |
| A. | Vane angle |
| B. | Moving fluid |
| C. | Increase in temperature |
| D. | Heat rejection |
| Answer» C. Increase in temperature | |
| 625. |
Which of the following runner types will have the highest vane angle at inlet (β1 value)? |
| A. | Slow Runner |
| B. | Medium Runner |
| C. | Fast Runner |
| D. | Vane angle is defined only for Kaplan Turbines and not Francis turbines |
| Answer» D. Vane angle is defined only for Kaplan Turbines and not Francis turbines | |
| 626. |
If x is the distance from leading edge, then the boundary layer thickness inlaminar flow varies as |
| A. | x |
| B. | x |
| C. | x |
| D. | x/7 |
| Answer» B. x | |
| 627. |
The main difference between reaction turbine and inward radial flow reaction turbine iswater flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» C. Radially outward | |
| 628. |
is a axial flow reaction turbines, if vanes are fixed to hub of turbine |
| A. | Propeller turbine |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | Pelton turbine |
| Answer» B. Francis turbine | |
| 629. |
To obtain maximum hydraulic efficiency of pelton turbine, blade velocity should be Times the inlet velocity of jet. |
| A. | Half |
| B. | One quarter |
| C. | Twice |
| D. | Thrice |
| Answer» B. One quarter | |
| 630. |
With the increase in cavitation, the drag coefficient of the impeller |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 631. |
Coefficient of friction of a laminar flow is_________ |
| A. | Re/16 |
| B. | Re/64 |
| C. | 16/Re |
| D. | 64/Re View Answer |
| Answer» D. 64/Re View Answer | |
| 632. |
For the figure given below, find the missing terms in the order of (1), (2), (3) and (4). |
| A. | Vr1, α1, β1, Vw1 |
| B. | Vw1, β1, α1, Vr1 |
| C. | Vw1, α1, β1, Vr1 |
| D. | Vr1, β1, α1, Vw1 |
| Answer» D. Vr1, β1, α1, Vw1 | |
| 633. |
Dyne cm is a Torque measurement unit. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 634. |
Internal cavitation occurs due to |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» D. Flow speed View Answer | |
| 635. |
For a good condition, slip should be_ |
| A. | Below 1 percent |
| B. | 1 to 2 percent |
| C. | 3 to 4 percent |
| D. | Above 5 percent View Answer |
| Answer» B. 1 to 2 percent | |
| 636. |
Specific speed develops a unit power under a unit |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Head |
| Answer» E. | |
| 637. |
What is D’Alembert’s Paradox? |
| A. | Resistance= 0 |
| B. | Drag force= 0 |
| C. | Temperature = 0 |
| D. | Pressure gradient= 0 |
| Answer» C. Temperature = 0 | |
| 638. |
In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is |
| A. | Difference between inlet jet velocity and blade velocity |
| B. | Sum of inlet jet velocity and blade velocity |
| C. | Inlet jet velocity |
| D. | Blade velocity |
| Answer» B. Sum of inlet jet velocity and blade velocity | |
| 639. |
In which of the following type of runners in a Kaplan turbine the velocity of whirl at inlet is smaller than the blade velocity? |
| A. | Such a case is practically impossible |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» E. | |
| 640. |
14. Power operated pump in which only both sides engage the fluid displacement is called |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» D. Bicycle pump View Answer | |
| 641. |
Turbine extracts energy from |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Fluid flow |
| D. | Volumetric ratio |
| Answer» D. Volumetric ratio | |
| 642. |
Rotary pumps are commonly used to circulate_ |
| A. | Lube oils |
| B. | Petroleum |
| C. | Diesel |
| D. | Water View Answer |
| Answer» B. Petroleum | |
| 643. |
Radial flow reaction turbines are those turbines in which water flows |
| A. | Radial direction |
| B. | Axial direction |
| C. | Tangential direction |
| D. | All of the mentioned |
| Answer» B. Axial direction | |
| 644. |
What is the name of the equation?h = (fvL) / (2Dg) |
| A. | Darcey equation |
| B. | Poiseuille law |
| C. | Reynolds equation |
| D. | Sherwood law |
| Answer» B. Poiseuille law | |
| 645. |
Why can’t rotary pumps non-lubricate water? |
| A. | Because it has lesser viscosity |
| B. | Because it contains abrasive particles |
| C. | Multistage pumps are difficult to operate |
| D. | Draft tube is thin View Answer |
| Answer» C. Multistage pumps are difficult to operate | |
| 646. |
Radial flow reaction turbines contain spiral casing which area |
| A. | Remains constant |
| B. | Gradually decreases |
| C. | Gradually increases |
| D. | Suddenly decreases |
| Answer» C. Gradually increases | |
| 647. |
Tendency of wheel to race is almost nil in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» B. Outward flow reaction turbine | |
| 648. |
The velocity component after striking the surface will be_ |
| A. | One |
| B. | Zero |
| C. | Infinity |
| D. | Negative |
| Answer» C. Infinity | |
| 649. |
Reciprocating pumps works on the principle of |
| A. | Drag force |
| B. | Liquid flow push |
| C. | Shock waves |
| D. | Flow speed View Answer |
| Answer» C. Shock waves | |
| 650. |
With the increase in energy head, efficiency |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» C. Remains same | |