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.
| 401. |
The head of the Kaplan ranges from |
| A. | 100 to 200 m |
| B. | 250 to 300 m |
| C. | 10 to 70 m |
| D. | 0 m |
| Answer» D. 0 m | |
| 402. |
A student reports the volumetric efficiency of a Kaplan turbine to be 95%. If he measures the volume flow rate through the turbine is 40 m3/s. What is the flow rate of water over the runner blades (in m3/s)? |
| A. | 38 |
| B. | 40 |
| C. | 42.11 |
| D. | 45 |
| Answer» B. 40 | |
| 403. |
NPSH is relevant |
| A. | Outside the pumps |
| B. | Inside the pumps |
| C. | Away from the pumps |
| D. | Series and parallel with the pumps View Answer |
| Answer» B. Inside the pumps | |
| 404. |
Specific speed is denoted by |
| A. | N |
| B. | n |
| C. | Ns |
| D. | S |
| Answer» D. S | |
| 405. |
Compounding is needed to |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» E. | |
| 406. |
Discharge in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» C. Remains constant | |
| 407. |
Minor losses occur due to |
| A. | sudden enlargement in pipe |
| B. | sudden contraction in pipe |
| C. | bends in pipe |
| D. | all of the above |
| Answer» B. sudden contraction in pipe | |
| 408. |
The outlet of the Kaplan turbine is through |
| A. | Vane Blades |
| B. | Moving pipeline |
| C. | Draft tube |
| D. | Pump |
| Answer» D. Pump | |
| 409. |
Component of velocity in direction of jet is -VCosθ |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 410. |
When the velocity distribution is uniform over the cross-section, thecorrection factor for momentum is |
| A. | 0 |
| B. | 1 |
| C. | 4/3 |
| D. | 2 |
| Answer» C. 4/3 | |
| 411. |
The head available at inlet of turbine |
| A. | Net positive suction head |
| B. | Gross head |
| C. | Net head |
| D. | Manometric head |
| Answer» D. Manometric head | |
| 412. |
The difference between gross head and friction losses is |
| A. | Net head |
| B. | Gross head |
| C. | Manometric head |
| D. | Net positive suction head |
| Answer» B. Gross head | |
| 413. |
A multistage centrifugal pump produces a pressure of |
| A. | 10 Pa |
| B. | 100 MPa |
| C. | 21 MPa |
| D. | 150 MPa View Answer |
| Answer» D. 150 MPa View Answer | |
| 414. |
The two opposite motion that comprise a single reciprocation is called |
| A. | Turbocharger |
| B. | Stokes |
| C. | Fluid motion |
| D. | Auto motion View Answer |
| Answer» B. Stokes | |
| 415. |
Constant speed curve is denoted as |
| A. | T |
| B. | V |
| C. | c |
| D. | V |
| Answer» D. V | |
| 416. |
The amount of fluid that leaks internally is called |
| A. | Head race |
| B. | Slip |
| C. | Tail race |
| D. | Internal friction View Answer |
| Answer» C. Tail race | |
| 417. |
is defined as ratio between power delivered to runner and power supplied at inlet of turbine. |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 418. |
A Kaplan turbine is used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» B. Pressure drag | |
| 419. |
NPSHr is determined by using |
| A. | Pump pressure |
| B. | PumpLinx |
| C. | Heat transfer |
| D. | Chemical energy View Answer |
| Answer» C. Heat transfer | |
| 420. |
In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» E. | |
| 421. |
When the mechanical speed of the shaft increases beyond 110 percent, we use |
| A. | Throttle governing |
| B. | Steam governing |
| C. | Nozzle governing |
| D. | Emergency governing |
| Answer» E. | |
| 422. |
An up and down back and forth relative linear motion is called |
| A. | Reciprocation |
| B. | Rotation |
| C. | Filtration |
| D. | Excavation View Answer |
| Answer» B. Rotation | |
| 423. |
The power available at the shaft of a Kaplan turbine is 0.75 MW. The volume flow rate of water in 15 m3/s, whirl velocity at inlet is 12 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)? |
| A. | 66.66 |
| B. | 75.00 |
| C. | 83.33 |
| D. | 91.33 |
| Answer» D. 91.33 | |
| 424. |
What does TDH stand for? |
| A. | Total dynamic head |
| B. | Total depth head |
| C. | Tight drum head |
| D. | Target dynamic head View Answer |
| Answer» B. Total depth head | |
| 425. |
The propulsive force drives the jet in the |
| A. | Backward direction |
| B. | Forward direction |
| C. | Perpendicular direction |
| D. | Parallel movement |
| Answer» C. Perpendicular direction | |
| 426. |
When time of closure tc = L/v0 (where L is length of pipe and v0 is speedof pressure wave), the portion of pipe length subjected to maximum head is |
| A. | L/4 |
| B. | L/3 |
| C. | L/2 |
| D. | L |
| Answer» B. L/3 | |
| 427. |
The ratio of average velocity to maximum velocity for steady laminar flowin circular pipes is |
| A. | 1/2 |
| B. | 2/3 |
| C. | 3/2 |
| D. | 2 |
| Answer» B. 2/3 | |
| 428. |
Decreasing the diameter of the eye of the impeller, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» B. Decreases | |
| 429. |
Unit quantities play an important role in determining the dimensional quantities. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 430. |
What is the effect of change in Reynold’s number on friction factor in turbulent flow? |
| A. | As the Reynold’s number increases the friction factor increases in turbulent flow |
| B. | As the Reynold’s number increases the friction factor decreases in turbulent flow |
| C. | change in Reynold’s number does not affect the friction factor in turbulent flow |
| D. | unpredictable |
| Answer» B. As the Reynold’s number increases the friction factor decreases in turbulent flow | |
| 431. |
A jet after striking a smooth plate comes out with a velocity. |
| A. | Increased |
| B. | Decreased |
| C. | Same |
| D. | Zero |
| Answer» D. Zero | |
| 432. |
Specific speed less than 500 are called |
| A. | Positive displacement pumps |
| B. | Negative displacement pumps |
| C. | Draft tubes |
| D. | Tanks |
| Answer» B. Negative displacement pumps | |
| 433. |
If the weight of a body immersed in a fluid exceeds the buoyant force, thenthe body will |
| A. | rise until its weight equals the buoyant force |
| B. | tend to move downward and it may finally sink |
| C. | float |
| D. | none of the above |
| Answer» C. float | |
| 434. |
Kaplan turbine is an reaction turbine |
| A. | Inward flow |
| B. | Outward flow |
| C. | Radial |
| D. | Axial |
| Answer» B. Outward flow | |
| 435. |
Positive displacement pumps are also called as_ |
| A. | Constant pressure pump |
| B. | Pressure drag pumps |
| C. | Constant volume pumps |
| D. | Constant head pumps View Answer |
| Answer» D. Constant head pumps View Answer | |
| 436. |
Constant speed curves are determined by the |
| A. | Arc length |
| B. | Power |
| C. | Heat |
| D. | Temperature |
| Answer» D. Temperature | |
| 437. |
Hydraulic energy is converted into another form of energy by hydraulic machines. What formof energy is that? |
| A. | Mechanical Energy |
| B. | Electrical Energy |
| C. | Nuclear Energy |
| D. | Elastic Energy |
| Answer» B. Electrical Energy | |
| 438. |
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/secthrough a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be |
| A. | 300 |
| B. | 337.5 |
| C. | 600 |
| D. | 675 |
| Answer» E. | |
| 439. |
When an ideal fluid flows past a sphere, |
| A. | highest intensity of pressure occurs around the circumference at right angles to flow |
| B. | lowest pressure intensity occurs at front stagnation point |
| C. | lowest pressure intensity occurs at rear stagnation point |
| D. | total drag is zero |
| Answer» E. | |
| 440. |
PHE stands for |
| A. | Pump Hydraulic efficiency |
| B. | Pressure Hydraulic efficiency |
| C. | Power Hydraulic efficiency |
| D. | Pump hydraulic engine View Answer |
| Answer» B. Pressure Hydraulic efficiency | |
| 441. |
Which among the following velocities cannot be found using the velocity triangle? |
| A. | Tangential |
| B. | Whirl |
| C. | Relative |
| D. | Parabolic |
| Answer» E. | |
| 442. |
Into how many types can you classify radial flow turbines? |
| A. | 4 |
| B. | 3 |
| C. | 6 |
| D. | 2 |
| Answer» E. | |
| 443. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head ofwater. |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» C. Remain same | |
| 444. |
What type of turbine is Kaplan? |
| A. | Impulse |
| B. | Reaction |
| C. | Energy |
| D. | Hydro |
| Answer» C. Energy | |
| 445. |
The point in the immersed body through which the resultant pressure ofthe liquid may be taken to act is known as |
| A. | center of gravity |
| B. | center of buoyancy |
| C. | center of pressure |
| D. | metacentre |
| Answer» D. metacentre | |
| 446. |
Unit discharge is directly proportional to |
| A. | Head race distance |
| B. | Discharge of fluid in the turbine. |
| C. | Pressure |
| D. | Turbine performance |
| Answer» C. Pressure | |
| 447. |
An open tank containing liquid is moving with an acceleration on an inclined plane. Theinclination of the free surface of the liquid will be __________ to the acceleration of the tank. |
| A. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 448. |
In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet= 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine? |
| A. | 5 m/s |
| B. | 10 m/s |
| C. | 12.5 m/s |
| D. | 15 m/s |
| Answer» C. 12.5 m/s | |
| 449. |
Francis and Kaplan turbines are known as |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Axial flow turbine |
| D. | Mixed flow turbine |
| Answer» C. Axial flow turbine | |
| 450. |
Unit discharge is the discharge through the turbine when the head of the turbine is |
| A. | High |
| B. | Zero |
| C. | Unity |
| D. | Low |
| Answer» D. Low | |