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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.
| 751. |
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge |
| A. | Same quantity of liquid |
| B. | 0.75 Q |
| C. | Q/0.75 |
| D. | 1.5 Q |
| Answer» B. 0.75 Q | |
| 752. |
The value of mass density in kg-sec-V-m⁴ for water at 0°C is |
| A. | 1 |
| B. | 1000 |
| C. | 100.9 |
| D. | 101.9 |
| Answer» E. | |
| 753. |
Which of the following pump is successfully used for lifting water to the boilers? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Airlift pump |
| Answer» D. Airlift pump | |
| 754. |
Francis, Kaplan and propeller turbines fall under the category of |
| A. | Impulse turbines |
| B. | Reaction turbines |
| C. | Axial flow turbines |
| D. | Mixed flow turbines |
| Answer» C. Axial flow turbines | |
| 755. |
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be |
| A. | 1000 kg |
| B. | 4000 kg |
| C. | 2000 kg |
| D. | 8000 kg |
| Answer» B. 4000 kg | |
| 756. |
An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice. |
| A. | Free |
| B. | Partially |
| C. | Full |
| D. | None of these |
| Answer» D. None of these | |
| 757. |
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice. |
| A. | Less than twice |
| B. | More than twice |
| C. | Less than three times |
| D. | More than three times |
| Answer» D. More than three times | |
| 758. |
A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the |
| A. | Kinetic head |
| B. | Velocity head |
| C. | Manometric head |
| D. | Static head |
| Answer» D. Static head | |
| 759. |
A structure used to dam up a stream or river over which the water flows is called |
| A. | Orifice |
| B. | Notch |
| C. | Weir |
| D. | Dam |
| Answer» D. Dam | |
| 760. |
Euler's equation in the differential form for the motion of liquids is given by |
| A. | dp/ρ + g.dz + v.dv = 0 |
| B. | dp/ρ - g.dz + v.dv = 0 |
| C. | ρ.dp + g.dz + v.dv = 0 |
| D. | ρ.dp - g.dz + v.dv = 0 |
| Answer» B. dp/ρ - g.dz + v.dv = 0 | |
| 761. |
Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as |
| A. | Lift |
| B. | Drag |
| C. | Stagnation pressure |
| D. | Bulk modulus |
| Answer» C. Stagnation pressure | |
| 762. |
The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe) |
| A. | v²/2g |
| B. | 0.5v²/2g |
| C. | 0.375v²/2g |
| D. | 0.75v²/2g |
| Answer» C. 0.375v²/2g | |
| 763. |
The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe) |
| A. | v²/2g |
| B. | 0.5v²/2g |
| C. | 0.375v²/2g |
| D. | 0.75v²/2g |
| Answer» B. 0.5v²/2g | |
| 764. |
The angle of contact in case of a liquid depends upon |
| A. | The nature of the liquid and the solid |
| B. | The material which exists above the free surface of the liquid |
| C. | Both of die above |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 765. |
General energy equation holds for |
| A. | Steady flow |
| B. | Turbulent flow |
| C. | Laminar flow |
| D. | Non-uniform flow |
| Answer» E. | |
| 766. |
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of |
| A. | High initial and maintenance cost |
| B. | Lower discharge |
| C. | Lower speed of operation |
| D. | Necessity of air vessel |
| Answer» B. Lower discharge | |
| 767. |
Multistage centrifugal pumps are used to |
| A. | Give high discharge |
| B. | Produce high heads |
| C. | Pump viscous fluids |
| D. | All of these |
| Answer» C. Pump viscous fluids | |
| 768. |
Manometric head, in case of a centrifugal pump, is equal to |
| A. | Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe |
| B. | Work-done per kN of water Losses within the impeller |
| C. | Energy per kN at outlet of impeller Energy per kN at inlet of impeller |
| D. | All of the above |
| Answer» E. | |
| 769. |
For small discharge at high pressure, following pump is preferred |
| A. | Centrifugal |
| B. | Axial flow |
| C. | Mixed flow |
| D. | Reciprocating |
| Answer» E. | |
| 770. |
For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred |
| A. | Centrifugal |
| B. | Axial flow |
| C. | Reciprocating |
| D. | Mixed flow |
| Answer» C. Reciprocating | |
| 771. |
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is |
| A. | 39.2% |
| B. | 48.8% |
| C. | 84.8% |
| D. | 88.4% |
| Answer» D. 88.4% | |
| 772. |
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is |
| A. | 39.2% |
| B. | 48.8% |
| C. | 84.8% |
| D. | 88.4% |
| Answer» B. 48.8% | |
| 773. |
Practical fluids |
| A. | Are viscous |
| B. | Possess surface tension |
| C. | Are compressible |
| D. | Possess all the above properties |
| Answer» E. | |
| 774. |
One poise is equal to |
| A. | 0.1 N-s/m2 |
| B. | 1 N-s/m2 |
| C. | 10 N-s/m2 |
| D. | 100 N-s/m2 |
| Answer» B. 1 N-s/m2 | |
| 775. |
The hammer blow in pipes occurs when |
| A. | There is excessive leakage in the pipe |
| B. | The pipe bursts under high pressure of fluid |
| C. | The flow of fluid through the pipe is suddenly brought to rest by closing of the valve |
| D. | The flow of fluid through the pipe is gradually brought to rest by closing of the valve |
| Answer» D. The flow of fluid through the pipe is gradually brought to rest by closing of the valve | |
| 776. |
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called |
| A. | Weir |
| B. | Notch |
| C. | Orifice |
| D. | None of these |
| Answer» C. Orifice | |
| 777. |
The depth of the centre of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is |
| A. | 2.4 m |
| B. | 3.0 m |
| C. | 4.0 m |
| D. | 5.0 m |
| Answer» C. 4.0 m | |
| 778. |
Mechanical efficiency of a centrifugal pump is the ratio of |
| A. | Energy available at the impeller to the energy supplied to the pump by the prime mover |
| B. | Actual work-done by the pump to the energy supplied to the pump by the prime mover |
| C. | Energy supplied to the pump to the energy available at the impeller |
| D. | Manometric head to the energy supplied by the impeller per kN of water |
| Answer» B. Actual work-done by the pump to the energy supplied to the pump by the prime mover | |
| 779. |
Overall efficiency of a centrifugal pump is the ratio of |
| A. | Energy available at the impeller to the energy supplied to the pump by the prime mover |
| B. | Actual work-done by the pump to the energy supplied to the pump by the prime mover |
| C. | Energy supplied to the pump to the energy available at the impeller |
| D. | Manometric head to the energy supplied by the impeller per kN of water |
| Answer» C. Energy supplied to the pump to the energy available at the impeller | |
| 780. |
The buoyancy depends on |
| A. | Mass of liquid displaced |
| B. | Viscosity of the liquid |
| C. | Pressure of the liquid displaced |
| D. | Depth of immersion |
| Answer» B. Viscosity of the liquid | |
| 781. |
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water |
| A. | 51 cm |
| B. | 50 cm |
| C. | 52 cm |
| D. | 52.2 cm |
| Answer» B. 50 cm | |
| 782. |
In a venturi-flume, the flow takes place at |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | None of these |
| Answer» B. Gauge pressure | |
| 783. |
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the |
| A. | Pressure head |
| B. | Velocity head |
| C. | Pressure head + velocity head |
| D. | Pressure head - velocity head |
| Answer» B. Velocity head | |
| 784. |
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel) |
| A. | (q/g)1/2 |
| B. | (q²/g)1/3 |
| C. | (q³/g)1/4 |
| D. | (q⁴/g)1/5 |
| Answer» C. (q³/g)1/4 | |
| 785. |
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is |
| A. | μ π³ N² R² /1800 t |
| B. | μ π³ N² R⁴ /1800 t |
| C. | μ π³ N² R² /3600 t |
| D. | μ π³ N² R⁴ /3600 t |
| Answer» C. μ π³ N² R² /3600 t | |
| 786. |
The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is |
| A. | 40% |
| B. | 50% |
| C. | 60% |
| D. | 80% |
| Answer» C. 60% | |
| 787. |
The total energy of a liquid particle in motion is equal to |
| A. | Pressure energy + kinetic energy + potential energy |
| B. | Pressure energy - (kinetic energy + potential energy) |
| C. | Potential energy - (pressure energy + kinetic energy |
| D. | Kinetic energy - (pressure energy + potential energy) |
| Answer» B. Pressure energy - (kinetic energy + potential energy) | |
| 788. |
A large Reynold number is indication of |
| A. | Smooth and streamline flow |
| B. | Laminar flow |
| C. | Steady flow |
| D. | Highly turbulent flow |
| Answer» E. | |
| 789. |
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately |
| A. | 5 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 30 mm |
| Answer» E. | |
| 790. |
Motion of a liquid in a volute casing of a centrifugal pump is an example of |
| A. | Rotational flow |
| B. | Radial |
| C. | Forced spiral vortex flow |
| D. | Spiral vortex flow |
| Answer» E. | |
| 791. |
The flow of water through the hole in the bottom of a wash basin is an example of |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Free vortex |
| D. | Forced vortex |
| Answer» D. Forced vortex | |
| 792. |
A hydraulic press is a device used |
| A. | To store pressure energy which may be supplied to a machine later on |
| B. | To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure |
| C. | To lift larger load by the application of a comparatively much smaller force |
| D. | All of the above |
| Answer» D. All of the above | |
| 793. |
The tangential velocity of the water element having a free vortex is |
| A. | Directly proportional to its distance from the centre |
| B. | Inversely proportional to its distance from the centre |
| C. | Directly proportional to its (distance)2 from the centre |
| D. | Inversely proportional to its (distance)2 from the centre |
| Answer» C. Directly proportional to its (distance)2 from the centre | |
| 794. |
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to |
| A. | The weight of the body |
| B. | More than the weight of the body |
| C. | Less than the weight of the body |
| D. | Weight of the fluid displaced by the body |
| Answer» E. | |
| 795. |
A hydraulic ram is a device used to |
| A. | Store the energy of water |
| B. | Increase the pressure of water |
| C. | To lift water from deep wells |
| D. | To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height |
| Answer» E. | |
| 796. |
The Cipoletti weir is a __________ weir. |
| A. | Rectangular |
| B. | Triangular |
| C. | Trapezoidal |
| D. | Circular |
| Answer» D. Circular | |
| 797. |
A flow in which the quantity of liquid flowing per second is constant, is called __________ flow. |
| A. | Steady |
| B. | Streamline |
| C. | Turbulent |
| D. | Unsteady |
| Answer» B. Streamline | |
| 798. |
The centre of buoyancy is the centre of area of the immersed body. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 799. |
The Bernoulli's equation is based on the assumption that |
| A. | there is no loss of energy of the liquid flowing |
| B. | the velocity of flow is uniform across any cross-section of the pipe |
| C. | no force except gravity acts on the fluid |
| D. | all of the above |
| Answer» E. | |
| 800. |
In open channels, the specific energy is the |
| A. | total energy per unit discharge |
| B. | total energy measured with respect to the datum passing through the bottom of the channel |
| C. | total energy measured above the horizontal datum |
| D. | kinetic energy plotted above the free surface of water |
| Answer» C. total energy measured above the horizontal datum | |