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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.
| 551. |
The important type of axial flow reaction turbines are |
| A. | Propeller and Pelton turbines |
| B. | Kaplan and Francis turbines |
| C. | Propeller and Francis turbines |
| D. | Propeller and Kaplan turbines |
| Answer» E. | |
| 552. |
What is the other name for Stoke’s boundary layer? |
| A. | Momentum boundary layer |
| B. | Atmospheric boundary layer |
| C. | Oscillatory boundary layer |
| D. | Thermal boundary layer |
| Answer» D. Thermal boundary layer | |
| 553. |
What does DMU stand for? |
| A. | Density matter usage |
| B. | Direct material usage |
| C. | Density material usage |
| D. | Depth matter usage |
| Answer» C. Density material usage | |
| 554. |
A pump that can evacuate air is called as |
| A. | Series pumps |
| B. | Self priming pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» C. Froth pumps | |
| 555. |
The formation of vapour cavities is called |
| A. | Static pressure drop |
| B. | Cavitation |
| C. | Isentropic expansion |
| D. | Emulsion |
| Answer» C. Isentropic expansion | |
| 556. |
Specific speed of a Francis turbine is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 230 to 500 |
| Answer» D. 230 to 500 | |
| 557. |
How many types of Reaction turbines are there? |
| A. | 5 |
| B. | 4 |
| C. | 3 |
| D. | 9 |
| Answer» B. 4 | |
| 558. |
A Kaplan turbine requires a speed ratio of 2. The available head of the turbine is 5 m. What should be the blade velocity of the turbine such that a speed ratio of 2 is maintained (take g = 10 m/s2)? |
| A. | 75.75 m/s |
| B. | 63.25 m/s |
| C. | 23.35 m/s |
| D. | 50.00 m/s |
| Answer» C. 23.35 m/s | |
| 559. |
A jet strikes a curved plate at its |
| A. | Sides |
| B. | Surface |
| C. | Centre |
| D. | Does not strike |
| Answer» D. Does not strike | |
| 560. |
Degree of reactions are most commonly used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles View Answer |
| Answer» B. Pressure drag | |
| 561. |
Drag force is a function of i) projected area of the body ii) mass density of the fluid iii) velocity of the body The correct answer is |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 562. |
Before reaching the turbine, the acceleration of the fluid takes place through the |
| A. | Vane angle |
| B. | Nozzle |
| C. | Pump |
| D. | Pipe |
| Answer» C. Pump | |
| 563. |
In the outlet velocity triangle of a Kaplan turbine, β2 = 30o. Vf2 = 5 m/s. What is the relative velocity of the flow at outlet? |
| A. | 10 m/s |
| B. | 5.77 m/s |
| C. | 8.66 m/s |
| D. | 2.88 m/s |
| Answer» B. 5.77 m/s | |
| 564. |
Reciprocating pump is a |
| A. | Negative displacement pump |
| B. | Positive displacement pump |
| C. | Diaphragm pump |
| D. | Emulsion pump |
| Answer» C. Diaphragm pump | |
| 565. |
Conservation of angular momentum is described by |
| A. | Newtons equation |
| B. | Euler’s equation |
| C. | Rutherford’s equation |
| D. | Maxim equation View Answer |
| Answer» C. Rutherford’s equation | |
| 566. |
The inlet passage of water entry is controlled by |
| A. | Head race |
| B. | Gate |
| C. | Tail race |
| D. | Pump View Answer |
| Answer» C. Tail race | |
| 567. |
According to Manning's formula, the discharge through an open channel is (where M =Manning's constant) |
| A. | A × M × m1/2 × i2/3 |
| B. | A × M × m2/3 × i1/2 |
| C. | A1/2 × M2/3 × m × i |
| D. | A2/3 × M1/3 × m × i |
| Answer» C. A1/2 × M2/3 × m × i | |
| 568. |
Which among the following is a formula for force when it acts perpendicular to the direction of flow? |
| A. | pav2 SinθCosθ |
| B. | pav Sin2 θ |
| C. | pa Sin2 θ |
| D. | maE Sin2 θ |
| Answer» B. pav Sin2 θ | |
| 569. |
A liquid flowss through two similar pipes 1 and 2. If the ratio of their flow velocities v1 : v2 be 2:3, what will be the ratio of the head loss in the two pipes? |
| A. | 3:2 |
| B. | 9:4 |
| C. | 2:3 |
| D. | 4:9 View Answer |
| Answer» E. | |
| 570. |
Specific speed of a Pelton wheel with multiple jets is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 230 to 500 |
| Answer» C. 51 to 225 | |
| 571. |
The difference in the total head of the pump is called |
| A. | Manometric head |
| B. | Euler head |
| C. | Pressure head |
| D. | Shaft head View Answer |
| Answer» B. Euler head | |
| 572. |
Kaplan turbines rotates at a rate |
| A. | Increasing |
| B. | Decreasing |
| C. | Constant |
| D. | Increasing and then decreasing |
| Answer» D. Increasing and then decreasing | |
| 573. |
The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to |
| A. | V/2 |
| B. | V/3 |
| C. | V/4 |
| D. | V/5 |
| Answer» B. V/3 | |
| 574. |
Centrifugal pumps work under the same principle, but differ in their |
| A. | Working |
| B. | Functions |
| C. | Dimensions |
| D. | Impeller View Answer |
| Answer» C. Dimensions | |
| 575. |
Draft tube allows turbine to be placed above the tail race. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 576. |
A pipe of length more than double the diameter of orifice fitted externally or internally to theorifice is called a |
| A. | Notch |
| B. | Weir |
| C. | Mouthpiece |
| D. | Nozzle |
| Answer» D. Nozzle | |
| 577. |
In Inward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» C. Discharge | |
| 578. |
Centrifugal pumps are used to transport |
| A. | Pressure |
| B. | Speed |
| C. | Power |
| D. | Fluid View Answer |
| Answer» E. | |
| 579. |
The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is |
| A. | 80mm |
| B. | 85mm |
| C. | 90mm |
| D. | 82mm |
| Answer» C. 90mm | |
| 580. |
Constant speed curves are |
| A. | Scalar quantities |
| B. | Vector quantities |
| C. | Constant quantities |
| D. | Different conditions |
| Answer» C. Constant quantities | |
| 581. |
The expression for maximum hydraulic efficiency of Pelto turbine is given by |
| A. | (1+cos k)/2 where k is outlet blade angle |
| B. | (2+cos k)/2 where k is outlet blade angle |
| C. | (3+cos k)/2 where k is outlet blade angle |
| D. | (4+cos k)/2 where k is outlet blade angle |
| Answer» B. (2+cos k)/2 where k is outlet blade angle | |
| 582. |
Suction stroke becomes difficult to pump |
| A. | High temperature fluids |
| B. | Viscous fluids |
| C. | Fluids with abrasives |
| D. | High velocity fluids View Answer |
| Answer» C. Fluids with abrasives | |
| 583. |
9 Unit discharge is denoted as |
| A. | Du |
| B. | Qu |
| C. | Su |
| D. | Nu |
| Answer» C. Su | |
| 584. |
In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as |
| A. | Specific density of liquid |
| B. | Density of liquid |
| C. | Specific gravity of liquid |
| D. | Volume of liquid |
| Answer» C. Specific gravity of liquid | |
| 585. |
is ratio of pressure energy change inside runner to total energy change inside runner |
| A. | Degree of reaction |
| B. | Speed ratio |
| C. | Flow ratio |
| D. | Hydraulic efficiency |
| Answer» B. Speed ratio | |
| 586. |
With the increase in the flow rate, efficiency |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» C. Remains same | |
| 587. |
The casing of radial flow reaction turbine is made of spiral shape, so that water mayenter the runner |
| A. | Variable acceleration |
| B. | Constant acceleration |
| C. | Variable velocity |
| D. | Constant velocity |
| Answer» E. | |
| 588. |
The position of center of pressure on a plane surface immersed vertically ina static mass of fluid is |
| A. | at the centroid of the submerged area |
| B. | always above the centroid of the area |
| C. | always below the centroid of the area |
| D. | none of the above |
| Answer» D. none of the above | |
| 589. |
Reciprocating pump is a type of |
| A. | Positive displacement pump |
| B. | Bicycle pump |
| C. | Multistage pumps |
| D. | Centrifugal pumps View Answer |
| Answer» B. Bicycle pump | |
| 590. |
In Pelton is ratio of volume of water actually striking the runner and volume of water supplied to turbine? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» C. Hydraulic efficiency | |
| 591. |
The depth ‘d’ below the free surface at which the point velocity is equal tothe average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow.) |
| A. | 0.423 D |
| B. | 0.577 D |
| C. | 0.223 D |
| D. | 0.707 D |
| Answer» C. 0.223 D | |
| 592. |
Properties that do not affect a draft tube is |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» C. Pressure velocity | |
| 593. |
Reciprocating pumps give a flow |
| A. | Uniform |
| B. | Non- uniform |
| C. | Pulsating |
| D. | Sinusoidal View Answer |
| Answer» D. Sinusoidal View Answer | |
| 594. |
Degree of reaction for reaction turbine is |
| A. | 1- cot x /2(cot x –cot y ) |
| B. | 1+ cot x /2(cot x –cot y ) |
| C. | 1- cot x /2(cot x +cot y ) |
| D. | 1+ cot x /2(cot x +cot y ) |
| Answer» B. 1+ cot x /2(cot x –cot y ) | |
| 595. |
Where is the excess quantity of water from the pump accumulated? |
| A. | Froth tube |
| B. | Draft tube |
| C. | Air vessels |
| D. | Bicycle pump View Answer |
| Answer» D. Bicycle pump View Answer | |
| 596. |
Which among the following is not an important parameter to determine the performance of the turbine? |
| A. | Speed |
| B. | Discharge |
| C. | Head |
| D. | Volume of tank |
| Answer» E. | |
| 597. |
Turbine converts |
| A. | Work to energy |
| B. | Energy to work |
| C. | Work to Electricity |
| D. | Work to pressure |
| Answer» C. Work to Electricity | |
| 598. |
Outward flow reaction turbine will quite suitable for_ |
| A. | High head |
| B. | Medium head |
| C. | Low head |
| D. | Static head |
| Answer» C. Low head | |
| 599. |
The power output of Kaplan turbine ranges from |
| A. | 5 to 200 MW |
| B. | 1000 to 2000 MW |
| C. | 2000 to 3000 MW |
| D. | 5000 and above |
| Answer» B. 1000 to 2000 MW | |
| 600. |
Pressure vessel closures are used to |
| A. | Avoid breakage |
| B. | Avoid leakage |
| C. | Retain structures |
| D. | Maintain pressure View Answer |
| Answer» D. Maintain pressure View Answer | |