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.
| 351. |
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice ofcross-sectional area (a) at its bottom. The time required to empty the tank completely will be |
| A. | (2A√H₁)/(Cd × a√2g) |
| B. | (2AH₁)/(Cd × a√2g) |
| C. | (2AH₁3/2)/(Cd × a√2g) |
| D. | (2AH₁²)/(Cd × a√2g) |
| Answer» B. (2AH₁)/(Cd × a√2g) | |
| 352. |
With increase in power, the efficiency |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent View Answer |
| Answer» B. Increases | |
| 353. |
The total pressure on a plane surface inclined at an angle 9 with thehorizontal is equal to (where p is pressure intensity at centroid of area and A is area of plane surface.) |
| A. | PA |
| B. | pA sin 9 |
| C. | pA cos 9 |
| D. | pA tan 9 |
| Answer» B. pA sin 9 | |
| 354. |
A pressure vessel is used to hold |
| A. | Air |
| B. | Gases |
| C. | Molecules |
| D. | Solids View Answer |
| Answer» C. Molecules | |
| 355. |
The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ =Density of the fluid) |
| A. | K.ρ |
| B. | K/ρ |
| C. | ρ/K |
| D. | None of these |
| Answer» C. ρ/K | |
| 356. |
In centrifugal pumps, their capacity is affected due to |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Pressure View Answer |
| Answer» E. | |
| 357. |
Turbine that consists of moving nozzles and with fixed nozzles is called as |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» E. | |
| 358. |
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by(where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension) |
| A. | 4wd/σ cosα |
| B. | σ cosα/4wd |
| C. | 4σ cosα/wd |
| D. | wd/4σ cosα |
| Answer» D. wd/4σ cosα | |
| 359. |
What does Cv in jet propulsion equation stand for? |
| A. | Area of orifice |
| B. | Velocity |
| C. | Temperature coefficient |
| D. | Velocity coefficient |
| Answer» E. | |
| 360. |
The volume flow rate into a Kaplan turbine is Q m3/s. 0.10Q m3/s volume of water do not flow over the runner blades. What further information is required to find the volumetric efficiency (numerical value) of the Kaplan turbine? |
| A. | The numerical value of Q |
| B. | The available head of the turbine |
| C. | The RPM or the blade velocity of the turbine |
| D. | No further information is required |
| Answer» E. | |
| 361. |
At higher pressures, the impeller is connected in |
| A. | Series |
| B. | Parallel |
| C. | Equilibrium |
| D. | Series and parallel View Answer |
| Answer» B. Parallel | |
| 362. |
The ratio of pitch diameter of Pelton wheel to diameter of jet is known as |
| A. | Speed ratio |
| B. | Jet ratio |
| C. | Velocity ratio |
| D. | Co-efficient of velocity |
| Answer» C. Velocity ratio | |
| 363. |
Define Viscosity. |
| A. | Resistance to flow of object |
| B. | Resistance to flow of air |
| C. | Resistance to flow of fluid |
| D. | Resistance to flow of heat |
| Answer» D. Resistance to flow of heat | |
| 364. |
Which of the following instruments is used to measure flow on the application of Bernoulli'stheorem? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Nozzle |
| D. | All of the above |
| Answer» E. | |
| 365. |
The pump will become incapable of pumping in case of |
| A. | Gas bounding |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Casing breakage View Answer |
| Answer» E. | |
| 366. |
An example of reaction turbine is_ |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» B. Curtis turbine | |
| 367. |
is the electric power obtained from the energy of the water. |
| A. | Roto dynamic power |
| B. | Thermal power |
| C. | Nuclear power |
| D. | Hydroelectric power |
| Answer» E. | |
| 368. |
When an external force is not available in a pump, we use a |
| A. | Hydraulic cylinder |
| B. | Slip gauge |
| C. | Tail race |
| D. | Heater View Answer |
| Answer» B. Slip gauge | |
| 369. |
Power operated pump in which only one side engages the fluid displacement is called |
| A. | Froth pump |
| B. | Single acting |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» C. Double acting | |
| 370. |
Wear of impeller can be worsened by |
| A. | Draft tube |
| B. | Pump pressure |
| C. | Suspended solenoids |
| D. | Turbine head View Answer |
| Answer» D. Turbine head View Answer | |
| 371. |
The ratio of specific weight of a liquid to the specific weight of pure water at a standardtemperature is called |
| A. | Density of liquid |
| B. | Specific gravity of liquid |
| C. | Compressibility of liquid |
| D. | Surface tension of liquid |
| Answer» C. Compressibility of liquid | |
| 372. |
The characteristic curves of a centrifugal pump, plots required by the pump. |
| A. | Velocity |
| B. | Pressure |
| C. | NPSH |
| D. | Velocity and pressure View Answer |
| Answer» D. Velocity and pressure View Answer | |
| 373. |
Maximum Number of jets, generally, employed in an impulse turbine without jet interference can be? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» E. | |
| 374. |
Reciprocating pumps operate by drawing into the chamber |
| A. | Liquid |
| B. | Pressure |
| C. | Heat |
| D. | Electricity |
| Answer» B. Pressure | |
| 375. |
The volumetric efficiency of a Francis turbine is given to be 90%. If the volume flow rate through the turbine is 25 m3/s. What is the flow rate of water over the runner blades (in m3/s)? |
| A. | 20 |
| B. | 25 |
| C. | 22.5 |
| D. | 21.5 |
| Answer» D. 21.5 | |
| 376. |
Low specific speed in hydraulic head is developed due to |
| A. | Mass flow rate |
| B. | Increase in temperature |
| C. | Centrifugal force |
| D. | Increase in pressure |
| Answer» D. Increase in pressure | |
| 377. |
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressureis the __________ of the two pressures. |
| A. | Sum |
| B. | Difference |
| C. | Arithmetic mean |
| D. | Geometric mean |
| Answer» C. Arithmetic mean | |
| 378. |
Centrifugal pumps transport fluids by converting |
| A. | Kinetic energy to hydrodynamic energy |
| B. | Hydrodynamic energy to kinetic energy |
| C. | Mechanical energy to kinetic energy |
| D. | Mechanical energy to Hydrodynamic energy View Answer |
| Answer» B. Hydrodynamic energy to kinetic energy | |
| 379. |
Jet propulsion is a method of generating propulsive force by reaction of |
| A. | Accelerating mass |
| B. | Volume |
| C. | Mass flow rate |
| D. | Velocity |
| Answer» B. Volume | |
| 380. |
Unit speed is directly proportional to |
| A. | Head race distance |
| B. | Specific speed |
| C. | Pressure |
| D. | Turbine performance |
| Answer» C. Pressure | |
| 381. |
The approximate value of the constant speed curve is given by ratio of |
| A. | dy/dp |
| B. | dx/dp |
| C. | dt/dx |
| D. | dt/dy |
| Answer» B. dx/dp | |
| 382. |
Centrifugal flow is imparted when the_ |
| A. | Reaction flow is negative |
| B. | Reaction flow is positive |
| C. | Efficiency is 100 percent |
| D. | Reaction rate is negligible |
| Answer» D. Reaction rate is negligible | |
| 383. |
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, thenthe free level of fluid in a dipped glass tube will be |
| A. | Higher than the surface of liquid |
| B. | The same as the surface of liquid |
| C. | Lower than the surface of liquid |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 384. |
Unit power is developed by the turbine when the head of the turbine is unity. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 385. |
Vertical centrifugal pumps are also called as |
| A. | Froth pumps |
| B. | Multistage pumps |
| C. | Cantilever pumps |
| D. | Magnetic pumps View Answer |
| Answer» D. Magnetic pumps View Answer | |
| 386. |
There will be leakage only if there is |
| A. | High pressure |
| B. | High temperature |
| C. | Froths are generated |
| D. | Casing breakage View Answer |
| Answer» E. | |
| 387. |
The sum of components of shear forces in the direction of flow of fluid is called as |
| A. | shear drag |
| B. | friction drag |
| C. | skin drag |
| D. | all of the above |
| Answer» B. friction drag | |
| 388. |
The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%. |
| A. | 54 |
| B. | 5.4 |
| C. | 540 |
| D. | 0.54 |
| Answer» C. 540 | |
| 389. |
Specific speeds are used in pumps to determine |
| A. | Temperature |
| B. | Reaction speed |
| C. | Suction specific speed |
| D. | Wheel speed |
| Answer» D. Wheel speed | |
| 390. |
What is symbol for unit speed? |
| A. | S |
| B. | N |
| C. | Ns |
| D. | Nu |
| Answer» E. | |
| 391. |
The draft tube is an |
| A. | Interior tube |
| B. | Exterior tube |
| C. | Tank depth alternator |
| D. | Nozzle tube |
| Answer» C. Tank depth alternator | |
| 392. |
means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero. |
| A. | Axial discharge |
| B. | Tangential discharge |
| C. | Turbulent discharge |
| D. | Radial discharge |
| Answer» E. | |
| 393. |
Ratio of inertia force to surface tension is known as |
| A. | Mach number |
| B. | Froude number |
| C. | Reynolds’s number |
| D. | Weber's number |
| Answer» E. | |
| 394. |
A turbine is a |
| A. | Rotary mechanical device |
| B. | Static pressure drop device |
| C. | Electrical device |
| D. | Static temperature device |
| Answer» B. Static pressure drop device | |
| 395. |
The primary selection tool is called as |
| A. | Pump curve |
| B. | Speed curve |
| C. | Power curve |
| D. | Fluid curve View Answer |
| Answer» B. Speed curve | |
| 396. |
During a weak jump, the value of Froude lies in between |
| A. | 1 to 2.5 |
| B. | 2.5 to 3.5 |
| C. | Less than 1 |
| D. | Zero |
| Answer» B. 2.5 to 3.5 | |
| 397. |
If the cylinder is filled with fuel or air it is said to be |
| A. | 100% efficient |
| B. | Transfer efficient |
| C. | Nil efficient |
| D. | Flow effective View Answer |
| Answer» B. Transfer efficient | |
| 398. |
Kaplan turbine is an type turbine |
| A. | Pressure |
| B. | Inward flow |
| C. | Outward flow |
| D. | Velocity |
| Answer» C. Outward flow | |
| 399. |
The maximum thickness of boundary layer in a pipe of radius r is |
| A. | 0 |
| B. | r/2 |
| C. | r |
| D. | 2r |
| Answer» D. 2r | |
| 400. |
Head lost due to friction is given by k*f*L*v*v/D*2g where f- friction coefficient, L- length of pen stock, D- diameter of penstock and” k” is constant and its value is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |