MCQOPTIONS
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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.
| 501. |
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is |
| A. | 24.8 r.p.m. |
| B. | 48.2 r.p.m |
| C. | 82.4 r.p.m. |
| D. | 248 r.p.m |
| Answer» D. 248 r.p.m | |
| 502. |
The discharge through a reaction turbine with increase in unit speed |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 503. |
If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have. |
| A. | Geometric similarity |
| B. | Kinematic similarity |
| C. | Dynamic similarity |
| D. | None of these |
| Answer» D. None of these | |
| 504. |
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Could be any value |
| Answer» E. | |
| 505. |
Two pipe systems can be said to be equivalent, when the following quantities are same |
| A. | Friction loss and flow |
| B. | Length and diameter |
| C. | Flow and length |
| D. | Friction factor and diameter |
| Answer» B. Length and diameter | |
| 506. |
Alcohol is used in manometers because |
| A. | It has low vapour pressure |
| B. | It is clearly visible |
| C. | It has low surface tension |
| D. | It can provide longer column due to low density |
| Answer» E. | |
| 507. |
Choose the wrong statement. Alcohol is used in manometer, because |
| A. | Its vapour pressure is low |
| B. | It provides suitable meniscus for the inclined tube |
| C. | Its density is less |
| D. | It provides longer length for a given pressure difference |
| Answer» B. It provides suitable meniscus for the inclined tube | |
| 508. |
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is |
| A. | 14π R1/2/15Cd × a √(2g) |
| B. | 14π R3/2/15Cd × a √(2g) |
| C. | 14π R5/2/15Cd × a √(2g) |
| D. | 14π R7/2/15Cd × a √(2g) |
| Answer» D. 14π R7/2/15Cd × a √(2g) | |
| 509. |
For centrifugal pump impeller, the maximum value of the vane exit angle is |
| A. | 10° to 15° |
| B. | 15° to 20° |
| C. | 20° to 25° |
| D. | 25° to 30° |
| Answer» D. 25° to 30° | |
| 510. |
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary |
| A. | Directly as the air or gas density |
| B. | Inversely as square root of density |
| C. | Inversely as density |
| D. | As square of density |
| Answer» D. As square of density | |
| 511. |
The horizontal component of buoyant force is |
| A. | Negligible |
| B. | Same as buoyant force |
| C. | Zero |
| D. | None of the above |
| Answer» D. None of the above | |
| 512. |
The region between the separation streamline and the boundary surface of the solid body is known as |
| A. | Wake |
| B. | Drag |
| C. | Lift |
| D. | Boundary layer |
| Answer» B. Drag | |
| 513. |
An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is |
| A. | 10 m/sec² |
| B. | 9.81 m/sec² |
| C. | 9.75 m/sec² |
| D. | 9 m/sec |
| Answer» B. 9.81 m/sec² | |
| 514. |
The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger) |
| A. | (W/p) × (A/a) |
| B. | (p/W) × (a/A) |
| C. | (W/p) × (a/A) |
| D. | (p/W) × (A/a) |
| Answer» D. (p/W) × (A/a) | |
| 515. |
Fluid is a substance which offers no resistance to change of |
| A. | Pressure |
| B. | Flow |
| C. | Shape |
| D. | Volume |
| Answer» D. Volume | |
| 516. |
The pressure of liquid at throat in a Venturimeter is __________ than that at inlet. |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | None of these |
| Answer» C. Same | |
| 517. |
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to |
| A. | 1/2 × depth |
| B. | 1/2 × breadth |
| C. | 1/2 × sloping side |
| D. | 1/4 × (depth + breadth) |
| Answer» B. 1/2 × breadth | |
| 518. |
Pressure of the order of 10" torr can be measured by |
| A. | Bourdon tube |
| B. | Pirani Gauge |
| C. | Micro-manometer |
| D. | Ionisation gauge |
| Answer» E. | |
| 519. |
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of |
| A. | A triangle |
| B. | A paraboloid |
| C. | An ellipse |
| D. | None of these |
| Answer» C. An ellipse | |
| 520. |
A turbine pump is basically a centrifugal pump equipped additionally with |
| A. | Adjustable blades |
| B. | Backward curved blades |
| C. | Vaned diffusion casing |
| D. | Inlet guide blades |
| Answer» D. Inlet guide blades | |
| 521. |
The point at which the resultant pressure on an immersed surface acts, is known as |
| A. | Centre of gravity |
| B. | Centre of depth |
| C. | Centre of pressure |
| D. | Centre of immersed surface |
| Answer» D. Centre of immersed surface | |
| 522. |
For a floating body to be in stable equilibrium, its metacentre should be |
| A. | Below the center of gravity |
| B. | Below the center of buoyancy |
| C. | Above the center of buoyancy |
| D. | Above the center of gravity |
| Answer» E. | |
| 523. |
The force of buoyancy is always __________ the weight of the liquid displaced by the body. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 524. |
Flow of water in a pipe about 3 meters in diameter can be measured by |
| A. | Orifice plate |
| B. | Venturimeter |
| C. | Rotameter |
| D. | Pitot tube |
| Answer» E. | |
| 525. |
Any change in load is adjusted by adjusting following parameter on turbine |
| A. | Net head |
| B. | Absolute velocity |
| C. | Blade velocity |
| D. | Flow |
| Answer» E. | |
| 526. |
The resultant of all normal pressures acts |
| A. | At C.G. of body |
| B. | At center of pressure |
| C. | Vertically upwards |
| D. | At metacentre |
| Answer» D. At metacentre | |
| 527. |
In one dimensional flow, the flow |
| A. | Is steady and uniform |
| B. | Takes place in straight line |
| C. | Takes place in curve |
| D. | Takes place in one direction |
| Answer» C. Takes place in curve | |
| 528. |
A flow in which the viscosity of fluid is dominating over the inertia force is called |
| A. | Steady flow |
| B. | Unsteady flow |
| C. | Laminar flow |
| D. | Turbulent flow |
| Answer» D. Turbulent flow | |
| 529. |
Free surface of a liquid tends to contract to the smallest possible area due to force of |
| A. | Surface tension |
| B. | Viscosity |
| C. | Friction |
| D. | Cohesion |
| Answer» B. Viscosity | |
| 530. |
If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its |
| A. | Specific weight |
| B. | Specific mass |
| C. | Specific gravity |
| D. | Specific density |
| Answer» D. Specific density | |
| 531. |
Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | None of these |
| Answer» C. Kaplan turbine | |
| 532. |
When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid |
| A. | Remains horizontal |
| B. | Becomes curved |
| C. | Falls on the front end |
| D. | Falls on the back end |
| Answer» D. Falls on the back end | |
| 533. |
The pressure of air __________ with the increase of height from the surface of the earth. |
| A. | Does not change |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 534. |
A Pelton wheel is |
| A. | Tangential flow impulse turbine |
| B. | Inward flow impulse turbine |
| C. | Outward flow impulse turbine |
| D. | Inward flow reaction turbine |
| Answer» B. Inward flow impulse turbine | |
| 535. |
The cavitation in reaction turbines is avoided, to a great extent by |
| A. | Installing the turbine below the tail race level |
| B. | Using stainless steel runner of the turbine |
| C. | Providing highly polished blades to the runner |
| D. | All of the above |
| Answer» E. | |
| 536. |
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe) |
| A. | d = (D⁵/8fl)1/2 |
| B. | d = (D⁵/8fl)1/3 |
| C. | d = (D⁵/8fl)1/4 |
| D. | d = (D⁵/8fl)1/5 |
| Answer» D. d = (D⁵/8fl)1/5 | |
| 537. |
Water is a __________ fluid. |
| A. | Real |
| B. | Ideal |
| C. | Newtonian |
| D. | Non-Newtonian |
| Answer» D. Non-Newtonian | |
| 538. |
Water is _________ liquid. |
| A. | A compressible |
| B. | An incompressible |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 539. |
When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface. |
| A. | Concave |
| B. | Convex |
| C. | Plane |
| D. | None of these |
| Answer» B. Convex | |
| 540. |
The highest efficiency is obtained with a channel of __________ section. |
| A. | Circular |
| B. | Square |
| C. | Rectangular |
| D. | Trapezoidal |
| Answer» E. | |
| 541. |
When the Venturimeter is inclined, then for a given flow it will show __________ reading. |
| A. | Same |
| B. | More |
| C. | Less |
| D. | None of these |
| Answer» B. More | |
| 542. |
A notch is used to measure __________ of liquids. |
| A. | Pressure |
| B. | Discharge |
| C. | Velocity |
| D. | Volume |
| Answer» C. Velocity | |
| 543. |
Re-entrant or Borda's mouthpiece is an __________ mouthpiece. |
| A. | Internal |
| B. | External |
| C. | Both A and B |
| D. | None of these |
| Answer» B. External | |
| 544. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency. |
| A. | Hydraulic |
| B. | Mechanical |
| C. | Overall |
| D. | None of these |
| Answer» C. Overall | |
| 545. |
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium. |
| A. | Neutral |
| B. | Stable |
| C. | Unstable |
| D. | None of these |
| Answer» B. Stable | |
| 546. |
A flow through a long pipe at decreasing rate is called __________ uniform flow. |
| A. | Steady |
| B. | Unsteady |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 547. |
The surface tension of mercury at normal temperature is __________ that of water. |
| A. | Same as |
| B. | Lower than |
| C. | Higher than |
| D. | None of these |
| Answer» D. None of these | |
| 548. |
For 450 m head of water, _________ shall be used. |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | None of these |
| Answer» B. Kaplan turbine | |
| 549. |
The factional resistance of a pipe varies approximately with __________ of the liquid. |
| A. | Pressure |
| B. | Velocity |
| C. | Square of velocity |
| D. | Cube of velocity |
| Answer» D. Cube of velocity | |
| 550. |
The hydraulic 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 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» D. None of the above | |