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MCQOPTIONS
This section includes 832 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump) |
| A. | (w Hm) / (Q × ηo) |
| B. | (w Hm Q) / ηo |
| C. | (w Q) / (Hm × ηo) |
| D. | (w Q ηo) / Hm |
| Answer» C. (w Q) / (Hm × ηo) | |
| 402. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct? |
| A. | The pressure on the wall at the liquid level is minimum |
| B. | The pressure on the bottom of the wall is maximum |
| C. | The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum |
| D. | The pressure on the bottom of the wall is zero |
| Answer» D. The pressure on the bottom of the wall is zero | |
| 403. |
The process of diffusion of one liquid into the other through a semi permeable membrane is called |
| A. | Viscosity |
| B. | Osmosis |
| C. | Surface tension |
| D. | Cohesion |
| Answer» C. Surface tension | |
| 404. |
Which of the following is the unit of kinematic viscosity? |
| A. | Pascal |
| B. | Poise |
| C. | Stoke |
| D. | Faraday |
| Answer» D. Faraday | |
| 405. |
The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as |
| A. | Manometric efficiency |
| B. | Mechanical efficiency |
| C. | Overall efficiency |
| D. | Volumetric efficiency |
| Answer» E. | |
| 406. |
A pitot tube is used to measure the |
| A. | Velocity of flow at the required point in a pipe |
| B. | Pressure difference between two points in a pipe |
| C. | Total pressure of liquid flowing in a pipe |
| D. | Discharge through a pipe |
| Answer» B. Pressure difference between two points in a pipe | |
| 407. |
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water? |
| A. | 10 m/sec |
| B. | 25 m/sec |
| C. | 2 m/sec |
| D. | 50 m/sec |
| Answer» D. 50 m/sec | |
| 408. |
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called |
| A. | Up-thrust |
| B. | Reaction |
| C. | Buoyancy |
| D. | Metacentre |
| Answer» D. Metacentre | |
| 409. |
The resultant upward pressure of the fluid on an immersed body is called |
| A. | Up-thrust |
| B. | Buoyancy |
| C. | Center of pressure |
| D. | All the above are correct |
| Answer» C. Center of pressure | |
| 410. |
The center of gravity of the volume of the liquid displaced by an immersed body is called |
| A. | Center of gravity |
| B. | Center of pressure |
| C. | Metacenter |
| D. | Center of buoyancy |
| Answer» E. | |
| 411. |
An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of |
| A. | 1 |
| B. | 1.2 |
| C. | 0.8 |
| D. | 0.75 |
| Answer» E. | |
| 412. |
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is |
| A. | 1 |
| B. | 5 |
| C. | 7 |
| D. | 6 |
| Answer» E. | |
| 413. |
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be |
| A. | Running full |
| B. | Running free |
| C. | Partially running full |
| D. | Partially running free |
| Answer» C. Partially running full | |
| 414. |
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir. |
| A. | Equal to |
| B. | One-third |
| C. | Two-third |
| D. | Three-fourth |
| Answer» D. Three-fourth | |
| 415. |
The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H). |
| A. | P/ √H |
| B. | P/ H |
| C. | P/ H3/2 |
| D. | P/ H² |
| Answer» D. P/ H² | |
| 416. |
The speed of sound in a ideal gas varies directly as it’s |
| A. | Absolute temperature |
| B. | Temperature |
| C. | Density |
| D. | Modulus of elasticity |
| Answer» B. Temperature | |
| 417. |
The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet. |
| A. | Equal to |
| B. | 1.2 times |
| C. | 1.8 times |
| D. | Double |
| Answer» C. 1.8 times | |
| 418. |
The width of the bucket for a Pelton wheel is generally ________ the diameter of jet. |
| A. | Double |
| B. | Three times |
| C. | Four times |
| D. | Five times |
| Answer» E. | |
| 419. |
The magnitude of water hammer depends upon the |
| A. | Elastic properties of the pipe material |
| B. | Elastic properties of the liquid flowing through the pipe |
| C. | Speed at which the valve is closed |
| D. | All of the above |
| Answer» E. | |
| 420. |
The buoyancy depends upon the |
| A. | Weight of the liquid displaced |
| B. | Pressure with which the liquid is displaced |
| C. | Viscosity of the liquid |
| D. | Compressibility of the liquid |
| Answer» B. Pressure with which the liquid is displaced | |
| 421. |
In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» B. More than | |
| 422. |
Rotameter is a device used to measure |
| A. | Absolute pressure |
| B. | Velocity of fluid |
| C. | Flow |
| D. | Rotation |
| Answer» D. Rotation | |
| 423. |
Braking jet in an impulse turbine is used |
| A. | To break the jet of water |
| B. | To bring the runner to rest in a short time |
| C. | To change the direction of runner |
| D. | None of these |
| Answer» C. To change the direction of runner | |
| 424. |
A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 425. |
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 426. |
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | 0.5 a. √2gH |
| B. | 0.707 a. √2gH |
| C. | 0.855 a. √2gH |
| D. | a. √2gH |
| Answer» B. 0.707 a. √2gH | |
| 427. |
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | 0.855 a.√(2gH) |
| B. | 1.855 aH.√(2g) |
| C. | 1.585 a.√(2gH) |
| D. | 5.85 aH.√(2g) |
| Answer» B. 1.855 aH.√(2g) | |
| 428. |
The specific speed of turbine is defined as the speed of a unit |
| A. | Of such a size that it delivers unit discharge at unit head |
| B. | Of such a size that it delivers unit discharge at unit power |
| C. | Of such a size that it requires unit power per unit head |
| D. | Of such a size that it produces unit horse power with unit head |
| Answer» E. | |
| 429. |
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used? |
| A. | Pelton wheel with one nozzle |
| B. | Pelton wheel with two or more nozzles |
| C. | Kaplan turbine |
| D. | Francis turbine |
| Answer» B. Pelton wheel with two or more nozzles | |
| 430. |
According to fan laws, for fans having constant wheel diameter, the pressure varies |
| A. | Directly as fan speed |
| B. | Square of fan speed |
| C. | Cube of fan speed |
| D. | Square root of fan speed |
| Answer» C. Cube of fan speed | |
| 431. |
One cubic metre of water weighs |
| A. | 100 liters |
| B. | 250 liters |
| C. | 500 liters |
| D. | 1000 liters |
| Answer» E. | |
| 432. |
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice) |
| A. | Q = Cd × a × 2gh |
| B. | Q = (2/3). Cd × a × h |
| C. | Q = (Cd × a)/√(2gh) |
| D. | Q = (3Cd × a)/√(2h) |
| Answer» B. Q = (2/3). Cd × a × h | |
| 433. |
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice) |
| A. | Q = Cd × bH₁ × √(2gh) |
| B. | Q = Cd × bH2 × √(2gh) |
| C. | Q = Cd × b (H2 - H1) × √(2gh) |
| D. | Q = Cd × bH × √(2gh) |
| Answer» D. Q = Cd × bH × √(2gh) | |
| 434. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface. |
| A. | H/3 |
| B. | H/2 |
| C. | 2H/3 |
| D. | 3H/4 |
| Answer» D. 3H/4 | |
| 435. |
The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface) |
| A. | (IG/Ax̅) - x̅ |
| B. | (IG/x̅) - Ax̅ |
| C. | (Ax̅/IG) + x̅ |
| D. | (IG/Ax̅) + x̅ |
| Answer» E. | |
| 436. |
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface) |
| A. | wA |
| B. | wx |
| C. | wAx |
| D. | wA/x |
| Answer» D. wA/x | |
| 437. |
The mercury does not wet the glass. This is due to the property of the liquid known as |
| A. | Cohesion |
| B. | Adhesion |
| C. | Viscosity |
| D. | Surface tension |
| Answer» E. | |
| 438. |
The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid) |
| A. | 4μvl/wd² |
| B. | 8μvl/wd² |
| C. | 16μvl/wd² |
| D. | 32μvl/wd² |
| Answer» E. | |
| 439. |
The line of action of the buoyant force acts through the Centroid of the |
| A. | Submerged body |
| B. | Volume of the floating body |
| C. | Volume of the fluid vertically above the body |
| D. | Displaced volume of the fluid |
| Answer» E. | |
| 440. |
The atmospheric pressure at sea level is |
| A. | 103 kN/m2 |
| B. | 10.3 m of water |
| C. | 760 mm of mercury |
| D. | All of these |
| Answer» E. | |
| 441. |
The Euler's equation for the motion of liquids is based upon the assumption that |
| A. | The fluid is non - viscous, homogeneous and incompressible |
| B. | The velocity of flow is uniform over the section |
| C. | The flow is continuous, steady and along the stream line |
| D. | All of the above |
| Answer» E. | |
| 442. |
The overall efficiency of a reaction turbine is the ratio of |
| A. | Power produced by the turbine to the energy actually supplied by the turbine |
| B. | Actual work available at the turbine to the energy imparted to the wheel |
| C. | Work-done on the wheel to the energy (or head of water) actually supplied to the turbine |
| D. | None of the above |
| Answer» B. Actual work available at the turbine to the energy imparted to the wheel | |
| 443. |
The dynamic viscosity of gases __________ with rise in temperature. |
| A. | Remain unaffected |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» C. Decreases | |
| 444. |
The dynamic viscosity of the liquid __________ with rise in temperature. |
| A. | Remain unaffected |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» D. None of these | |
| 445. |
A fluid is said to be ideal, if it is |
| A. | Incompressible |
| B. | Viscous and incompressible |
| C. | Inviscous and compressible |
| D. | Inviscous and incompressible |
| Answer» E. | |
| 446. |
The pressure measured with the help of a pressure gauge is called |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | Mean pressure |
| Answer» C. Absolute pressure | |
| 447. |
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the |
| A. | Force of adhesion |
| B. | Force of cohesion |
| C. | Force of friction |
| D. | Force of diffusion |
| Answer» C. Force of friction | |
| 448. |
Which of the following pump is suitable for small discharge and high heads? |
| A. | Centrifugal pump |
| B. | Axial flow pump |
| C. | Mixed flow pump |
| D. | Reciprocating pump |
| Answer» E. | |
| 449. |
A flow whose streamline is represented by a straight line, is called __________ dimensional flow. |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» B. Two | |
| 450. |
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe) |
| A. | flv²/2gd |
| B. | flv²/gd |
| C. | 3flv²/2gd |
| D. | 4flv²/2gd |
| Answer» E. | |