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.
| 501. |
The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cmdia-meter pipe is 3200n cm7sec. The type of flow expected is |
| A. | laminar flow |
| B. | transition flow |
| C. | turbulent flow |
| D. | not predictable from the given data |
| Answer» B. transition flow | |
| 502. |
A reciprocating pump that has 1200 crank is |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Triple acting View Answer |
| Answer» E. | |
| 503. |
Volume flow rate of water in a Francis turbine runner is 25 m3/s. The flow velocity,whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Find the power developed by the turbine. |
| A. | 25 kW |
| B. | 1.25 MW |
| C. | 1.25 kW |
| D. | 25 MW |
| Answer» C. 1.25 kW | |
| 504. |
Capacity of a rotary pump is defined as |
| A. | Total liquid displaced |
| B. | Overall performance of pump |
| C. | Maximum fluid flow |
| D. | Minimum fluid flow View Answer |
| Answer» B. Overall performance of pump | |
| 505. |
With an increase in size of tube, the rise or depression of liquid in the tube due to surfacetension will |
| A. | Decrease |
| B. | Increase |
| C. | Remain unchanged |
| D. | Depend upon the characteristics of liquid |
| Answer» B. Increase | |
| 506. |
The energy usage in pumping installation is determined by |
| A. | Friction characteristics |
| B. | Pipe diameter |
| C. | Surface tension |
| D. | Thermal expansion View Answer |
| Answer» B. Pipe diameter | |
| 507. |
Tangential velocity of blade of Pelton wheel is proportional to |
| A. | Speed of wheel |
| B. | Angular velocity of wheel |
| C. | Rpm of wheel |
| D. | Speed, angular velocity, RPM of the wheel |
| Answer» B. Angular velocity of wheel | |
| 508. |
The depth of buckets of Pelton wheel |
| A. | 1.2 times diameter of jet |
| B. | 1.3 times diameter of jet |
| C. | 1.4 times diameter of jet |
| D. | 1.5 times diameter of jet |
| Answer» B. 1.3 times diameter of jet | |
| 509. |
The point at which the centrifugal pump operates at maximum efficiency is called |
| A. | Duty point |
| B. | Flow point |
| C. | Static point |
| D. | Operating point View Answer |
| Answer» B. Flow point | |
| 510. |
When a pump casing is filled with liquid before it is started, it is called as |
| A. | Adiabatic expansion |
| B. | Priming |
| C. | Adiabatic compression |
| D. | Isentropic expansion View Answer |
| Answer» C. Adiabatic compression | |
| 511. |
Impeller in a motor is used to |
| A. | Change temperatures |
| B. | Change Pressure |
| C. | Kinetic energy change |
| D. | Change density |
| Answer» C. Kinetic energy change | |
| 512. |
The inlet passage of centrifugal pump is controlled by |
| A. | Gate |
| B. | Head race |
| C. | Turbine |
| D. | Pump View Answer |
| Answer» B. Head race | |
| 513. |
Surge wave in a rectangular channel is an example ofi) steady flow ii) unsteady flow iii) uniform flow iv) non-uniform flow The correct answer is |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (:v) |
| D. | (ii) and (iv) |
| Answer» E. | |
| 514. |
In Pelton wheel, if outlet velocity angle of jet is “obtuseangled” 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» D. Zero | |
| 515. |
If the pressure remains a constant, then |
| A. | Vr1 > Vr2 |
| B. | Vr1 < Vr2 |
| C. | Vr1 = Vr2 |
| D. | Vr1 is a zero |
| Answer» D. Vr1 is a zero | |
| 516. |
The volumetric efficiency of a given turbine is 80%. If volume flow rate of water ingiven to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 5 |
| B. | 6 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 517. |
Ratio of pump or turbine with reference pump or turbine is called as |
| A. | Efficiency |
| B. | Performance |
| C. | Heat generated |
| D. | Relative velocity |
| Answer» C. Heat generated | |
| 518. |
The region between the separation streamline and the boundary surface of the solid body isknown as |
| A. | Wake |
| B. | Drag |
| C. | Lift |
| D. | Boundary layer |
| Answer» B. Drag | |
| 519. |
The drag force acts in _____ to the flow velocity. |
| A. | Perpendicular direction |
| B. | Same direction |
| C. | Opposite direction |
| D. | Different directions |
| Answer» D. Different directions | |
| 520. |
To derive pav2, we take final velocity minus the initial velocity. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» C. none | |
| 521. |
Specific speed predicts the shape of a/an |
| A. | Pump |
| B. | Density head |
| C. | Impeller |
| D. | Motor |
| Answer» D. Motor | |
| 522. |
The impeller is mounted on a |
| A. | Draft tube |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Shaft View Answer |
| Answer» E. | |
| 523. |
An outward flow reaction turbine, |
| A. | D1 > D2 |
| B. | D1 < D2 |
| C. | D1 = D2 |
| D. | D1 = D2 = 0 |
| Answer» C. D1 = D2 | |
| 524. |
Pen stocks are made up of |
| A. | Steel |
| B. | Cast iron |
| C. | Mild steel |
| D. | Wrought iron |
| Answer» B. Cast iron | |
| 525. |
In which pump is the liquid in contact with both the sides of the plunger |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» D. Bicycle pump View Answer | |
| 526. |
Centrifugal head in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» C. Remains constant | |
| 527. |
In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 528. |
The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. Thewhirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine? |
| A. | 26.124 m/s |
| B. | 40 m/s |
| C. | 36.124 m/s |
| D. | 60 m/s |
| Answer» D. 60 m/s | |
| 529. |
A repetitive variation about the central value of equilibrium is called |
| A. | Reciprocation |
| B. | Oscillation |
| C. | Filtration |
| D. | Excavation View Answer |
| Answer» C. Filtration | |
| 530. |
For an oil field to have solid control, it needs |
| A. | Draft tubes |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Centrifugal pumps View Answer |
| Answer» E. | |
| 531. |
Power of a turbine is measured |
| A. | Mechanically |
| B. | Electrically |
| C. | Chemically |
| D. | Thermally |
| Answer» B. Electrically | |
| 532. |
Draft tube allows turbine to be placed below the tail race. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» C. none | |
| 533. |
What does CPO stand for? |
| A. | Centrifugal pump operation |
| B. | Centrifugal part operation |
| C. | Centrifugal pump output |
| D. | Centrifugal part output View Answer |
| Answer» B. Centrifugal part operation | |
| 534. |
The flow rate of steam is controlled by regulating the_ |
| A. | Steam |
| B. | Pressure |
| C. | Temperature |
| D. | Speed |
| Answer» C. Temperature | |
| 535. |
The discharge over a broad crested weir is maximum when the depth of (where H is the available head.)flow is |
| A. | H/3 |
| B. | H/2 |
| C. | 2 H/5 |
| D. | 2 H/3 |
| Answer» E. | |
| 536. |
If the friction is neglected, then |
| A. | Vr1 > Vr2 |
| B. | Vr1 < Vr2 |
| C. | Vr1 = Vr2 |
| D. | Vr1 is a zero |
| Answer» D. Vr1 is a zero | |
| 537. |
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter ofan equivalent pipe is 40 cm, then its length is |
| A. | 32 km |
| B. | 20 km |
| C. | 8 km |
| D. | 4 km |
| Answer» B. 20 km | |
| 538. |
How many types of turbines can you classify on the basis of direction of flow through runner? |
| A. | 6 |
| B. | 3 |
| C. | 4 |
| D. | 7 |
| Answer» D. 7 | |
| 539. |
With the same cross-sectional area and immersed in same turbulent flow,the largest total drag will be on |
| A. | a circular disc of plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | a streamlined body |
| Answer» B. a sphere | |
| 540. |
IN what type of turbine water enters in radial direction and leaves axial direction? |
| A. | Tangential flow turbine |
| B. | Axial flow turbine |
| C. | Outward flow turbine |
| D. | Mixed flow turbine |
| Answer» E. | |
| 541. |
In all the characteristic curves, the overall efficiency is aimed at the maximum value. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 542. |
The mass of water per sec striking the plate is |
| A. | pav2 |
| B. | pav |
| C. | pa |
| D. | maE |
| Answer» C. pa | |
| 543. |
The width of buckets of Pelton wheel is |
| A. | 2 times diameter of jet |
| B. | 3 times diameter of jet |
| C. | 4 times diameter of jet |
| D. | 5 times diameter of jet |
| Answer» E. | |
| 544. |
Kaplan turbine is most commonly used in propeller turbines. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 545. |
Discharge through a reaction flow reaction turbine is given by, Q = |
| A. | Pi*d*b*Vf1 |
| B. | Pi*d*d*b*Vf1 |
| C. | Pi*d*b*b*Vf2 |
| D. | Pi*b*b*Vf1 |
| Answer» B. Pi*d*d*b*Vf1 | |
| 546. |
Simplest example of single acting reciprocating pump is |
| A. | Mineral ores |
| B. | Whirl wheels |
| C. | Bicycle tires |
| D. | Syringe View Answer |
| Answer» E. | |
| 547. |
In a stationery vertical plate, the jet after striking the plate will move |
| A. | In opposite direction |
| B. | Along the plate |
| C. | Perpendicular to the plate |
| D. | Parallel to the plate |
| Answer» C. Perpendicular to the plate | |
| 548. |
For a Kaplan turbine, the whirl velocity at inlet of the turbine is given to be 18 m/s. The blade velocity is given as 25 m/s. What is the hydraulic efficiency for a head of 50 m. Take g = 10 m/s2? |
| A. | 80% |
| B. | 90% |
| C. | 70% |
| D. | 98% |
| Answer» C. 70% | |
| 549. |
An open cubical tank of 2 m side is filled with water. If the tank is rotatedwith an acceleration such that half of the water spills out, then the acceleration is equal to |
| A. | g/3 |
| B. | g/2 |
| C. | 2g/3 |
| D. | g |
| Answer» E. | |
| 550. |
With the increase in the input power, efficiency |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» C. Same | |