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.
| 301. |
Z is a draft tube is |
| A. | Temperature difference |
| B. | Pressure drop |
| C. | Kinetic energy difference |
| D. | Datum head |
| Answer» E. | |
| 302. |
The point at which piping system controls the flow rate is called |
| A. | Pressure point |
| B. | Static lift |
| C. | Operating point |
| D. | Flow point View Answer |
| Answer» D. Flow point View Answer | |
| 303. |
Draft tubes have shafts |
| A. | Horizontal |
| B. | Vertical |
| C. | Circular |
| D. | Cross sectional |
| Answer» C. Circular | |
| 304. |
Coefficient of discharge for a totally submerged orifice as compared tothat for an orifice discharging free is |
| A. | slightly less |
| B. | slightly more |
| C. | nearly half |
| D. | equal |
| Answer» B. slightly more | |
| 305. |
Formation of bubbles in an impeller is called |
| A. | Cavities |
| B. | Defects |
| C. | Friction |
| D. | Heat burn View Answer |
| Answer» B. Defects | |
| 306. |
When a liquid rotates at a constant angular velocity about a vertical axisas a rigid body, the pressure intensity varies |
| A. | linearly with radial distance |
| B. | as the square of the radial distance |
| C. | inversely as the square of the radial distance |
| D. | inversely as the radial distance |
| Answer» C. inversely as the square of the radial distance | |
| 307. |
In case of gas turbines and compressors, degree of reaction is |
| A. | Static pressure drop in rotor/ static pressure drop in stage |
| B. | Static pressure drop in stage/ static pressure drop in rotor |
| C. | Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage |
| D. | Static temperature drop in stage/ static temperature drop in rotor |
| Answer» D. Static temperature drop in stage/ static temperature drop in rotor | |
| 308. |
Height of the draft tube is denoted by |
| A. | H |
| B. | h |
| C. | z |
| D. | x |
| Answer» D. x | |
| 309. |
In hydraulic head, NPSH is used for the analysis of |
| A. | Adiabatic expansion |
| B. | Priming |
| C. | Wear |
| D. | Cavitation View Answer |
| Answer» E. | |
| 310. |
Least possible value of correction factor fori) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» E. | |
| 311. |
The whirl velocity at inlet of a Kaplan turbine is 7.5 m/s and blade velocity is 5 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 93% (in MW)? |
| A. | 0.831 |
| B. | 0.697 |
| C. | 1.362 |
| D. | 0.298 |
| Answer» C. 1.362 | |
| 312. |
The ratio of manometric head to the work head is called |
| A. | Manometric head |
| B. | Euler head |
| C. | Pressure head |
| D. | Shaft head View Answer |
| Answer» C. Pressure head | |
| 313. |
The fundamental significance of all the turbomachinery is |
| A. | Conservation of momentum |
| B. | Conservation of mass |
| C. | Conservation of heat |
| D. | Conservation of speed View Answer |
| Answer» B. Conservation of mass | |
| 314. |
The boundary layer thickness in turbulent flow varies as (where x is the distance from leading edge.) |
| A. | x”7 |
| B. | x,/2 |
| C. | x4/5 |
| D. | x3/5 |
| Answer» D. x3/5 | |
| 315. |
A pump with two steams and two water cylinders is called |
| A. | Single acting pump |
| B. | Double acting pump |
| C. | Froth pump |
| D. | Duplex pump View Answer |
| Answer» E. | |
| 316. |
The electric power which is obtained from hydraulic energy |
| A. | Thermal power |
| B. | Mechanical power |
| C. | Solar power |
| D. | Hydroelectric power |
| Answer» E. | |
| 317. |
Velocity triangles are used to analyze |
| A. | Flow of water along blades of turbine |
| B. | Measure discharge of flow |
| C. | Angle of deflection of jet |
| D. | Flow of water, measure of discharge, angle of deflection. |
| Answer» E. | |
| 318. |
95*40 = 38 m3/s.358. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 4.05 |
| B. | 3.15 |
| C. | 3.30 |
| D. | 2.55 |
| Answer» C. 3.30 | |
| 319. |
When both the sources are effective it is called as |
| A. | Double acting pump |
| B. | Single acting pump |
| C. | Triple acting pump |
| D. | Normal pump View Answer |
| Answer» B. Single acting pump | |
| 320. |
Specific speed of a Pelton wheel with single jet is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 230 to 500 |
| Answer» B. 30 to 51 | |
| 321. |
Gear pumps are |
| A. | Tangential flow pumps |
| B. | Positive displacement pumps |
| C. | Negative displacement pumps |
| D. | Radial pumps View Answer |
| Answer» B. Positive displacement pumps | |
| 322. |
During the suction stroke the moves left thus creating vacuum in the Cylinder. |
| A. | Piston |
| B. | Cylinder |
| C. | Valve |
| D. | Pump View Answer |
| Answer» B. Cylinder | |
| 323. |
Runner blades are made up of |
| A. | Cast steel |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» B. Cast iron | |
| 324. |
In the expression for overall efficiency of turbine, which is p/(k*g*q*h), where “k” is known as |
| A. | Density of liquid |
| B. | Specific density of liquid |
| C. | Volume of liquid |
| D. | Specific gravity of liquid |
| Answer» B. Specific density of liquid | |
| 325. |
When do we apply by pass governing? |
| A. | When turbine is overloaded |
| B. | When Unit speed decreases |
| C. | When Unit power increases |
| D. | When Unit pressure decreases |
| Answer» B. When Unit speed decreases | |
| 326. |
The movement of ships and boats in water is due to |
| A. | Water currents |
| B. | Jet propulsion |
| C. | Mass flow rate |
| D. | Volumetric changes |
| Answer» C. Mass flow rate | |
| 327. |
Simple hand operating pump is also called as |
| A. | Froth pump |
| B. | Bicycle pump |
| C. | Multistage pumps |
| D. | Centrifugal pumps View Answer |
| Answer» C. Multistage pumps | |
| 328. |
Gear pumps are mainly used in chemical installations because they pump |
| A. | High viscosity fluids |
| B. | High density fluids |
| C. | High pressure fluids |
| D. | High temperature fluids View Answer |
| Answer» B. High density fluids | |
| 329. |
A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameterpipe. The maximum velocity for laminar flow will be |
| A. | less than 1 m/sec |
| B. | 1 m/sec |
| C. | 1.5 m/sec |
| D. | 2 m/sec |
| Answer» C. 1.5 m/sec | |
| 330. |
What is necessary for self priming to take place? |
| A. | Draft tube |
| B. | Pump casing |
| C. | Suspended solenoids |
| D. | Turbine head View Answer |
| Answer» C. Suspended solenoids | |
| 331. |
In constant speed curves, the speed is kept a constant varying its head. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 332. |
The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression |
| A. | [Vw1+Vw2] u/g |
| B. | Vw1*u/g |
| C. | [Vw1+Vw2]/g |
| D. | [Vw1+Vw2]u |
| Answer» B. Vw1*u/g | |
| 333. |
What is the effect of cavitation in boat propeller? |
| A. | It recirculates air |
| B. | The pressurizes the air |
| C. | It leads to fast spinning |
| D. | It breaks the bubbles View Answer |
| Answer» D. It breaks the bubbles View Answer | |
| 334. |
The specific weight of the fluid depends upon |
| A. | gravitational acceleration |
| B. | mass density of the fluid |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 335. |
In Pelton turbine 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 | |
| 336. |
Into how many types can you classify turbines on basis of head at inlet? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 5 |
| Answer» B. 4 | |
| 337. |
Operation of reciprocating motion is done by a source |
| A. | Power |
| B. | Energy |
| C. | Momentum |
| D. | Inertia View Answer |
| Answer» B. Energy | |
| 338. |
A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, theni) the ball will move to the front ii) the bubble will move to the front iii) the ball will move to the rear iv) the bubble will move to the rear Find out which of the above statements are correct ? |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 339. |
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift aweight of 1 tonne. The force required on plunger is equal to |
| A. | 10 kg |
| B. | 100 kg |
| C. | 1000 kg |
| D. | 1 kg |
| Answer» B. 100 kg | |
| 340. |
In Pelton wheel, if outlet velocity angle of jet is “acute angled” 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» B. x- component of V (r2) + blade velocity | |
| 341. |
Specific speed of reaction turbine is between? |
| A. | 5 and 50 |
| B. | 10 and 100 |
| C. | 100 and 150 |
| D. | 150 and 300 |
| Answer» C. 100 and 150 | |
| 342. |
In most of cases the value of jet ratio is |
| A. | 10 |
| B. | 11 |
| C. | 12 |
| D. | 13 |
| Answer» D. 13 | |
| 343. |
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H +Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach) |
| A. | (2/3) Cd × L.√2g [H1 - Ha] |
| B. | (2/3) Cd × L. √2g [H13/2 - Ha3/2] |
| C. | (2/3) Cd × L.√2g [H12 - Ha2] |
| D. | (2/3) Cd × L. √2g [H15/2 - Ha5/2] |
| Answer» C. (2/3) Cd × L.√2g [H12 - Ha2] | |
| 344. |
Due to each end contraction, the discharge of rectangular sharp crestedweir is reduced by |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» B. 10% | |
| 345. |
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up withliquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is |
| A. | π w ω² r²/4g |
| B. | π w ω² r³/4g |
| C. | π w ω² r⁴/4g |
| D. | π w ω² r²/2g |
| Answer» D. π w ω² r²/2g | |
| 346. |
When a cylinder has inlet and outlet ports at each end, then it is called as |
| A. | Double acting |
| B. | Air lift pumps |
| C. | Reciprocating pumps |
| D. | Centrifugal pumps View Answer |
| Answer» B. Air lift pumps | |
| 347. |
Which among the following is not a type of curve? |
| A. | Logarithimic curve |
| B. | Straight curve |
| C. | Pressure vs power |
| D. | Efficiency vs speed |
| Answer» D. Efficiency vs speed | |
| 348. |
The energy usage of a pump is determined by |
| A. | Adiabatic expansion |
| B. | Power required |
| C. | Adiabatic compression |
| D. | Isentropic expansion View Answer |
| Answer» C. Adiabatic compression | |
| 349. |
Sliding vanes in pumps are held by |
| A. | Draft pins |
| B. | Whirl wheels |
| C. | Springs |
| D. | Nails View Answer |
| Answer» D. Nails View Answer | |
| 350. |
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remainsthe same, while the particle moves from one point to another. This statement is called |
| A. | Continuity equation |
| B. | Bernoulli's equation |
| C. | Pascal's law |
| D. | Archimedes’s principle |
| Answer» C. Pascal's law | |