MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
The Thomson's turbine is _________ reaction turbine.? |
| A. | An axial flow |
| B. | An inward flow |
| C. | An outward flow |
| D. | A mixed flow |
| Answer» C. An outward flow | |
| 752. |
An impulse turbine is used for? |
| A. | Low head of water |
| B. | High head of water |
| C. | Medium head of water |
| D. | High discharge |
| Answer» C. Medium head of water | |
| 753. |
The height of a water column equivalent to a pressure of 0.15 MPa is? |
| A. | 15.3 m |
| B. | 25.3 m |
| C. | 35.3 m |
| D. | 45.3 m |
| Answer» B. 25.3 m | |
| 754. |
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is? |
| A. | 0.26 |
| B. | 0.36 |
| C. | 0.46 |
| D. | 0.56 |
| Answer» D. 0.56 | |
| 755. |
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are? |
| A. | Less |
| B. | More |
| C. | Equal |
| D. | Less at low temperature and more at high temperature |
| Answer» C. Equal | |
| 756. |
If ‘w’ is the specific weight of liquid and ‘k’ the depth of any point from the surface, then pressure intensity at that point will be? |
| A. | h |
| B. | wh |
| C. | w/h |
| D. | h/w |
| Answer» C. w/h | |
| 757. |
When the Mach number is more than 6, the flow is called? |
| A. | Sub-sonic flow |
| B. | Sonic flow |
| C. | Super-sonic flow |
| D. | Hyper-sonic flow |
| Answer» E. | |
| 758. |
For hypersonic flow, the Mach number is? |
| A. | Unity |
| B. | Greater than unity |
| C. | Greater than 2 |
| D. | Greater than 4 |
| Answer» E. | |
| 759. |
The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.? |
| A. | Equal |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 760. |
In a Francis turbine runner, the numbers of blades are generally between? |
| A. | 2 to 4 |
| B. | 4 to 8 |
| C. | 8 to 16 |
| D. | 16 to 24 |
| Answer» E. | |
| 761. |
The two important forces for a floating body are? |
| A. | Buoyancy, gravity |
| B. | Buoyancy, pressure |
| C. | Buoyancy, inertial |
| D. | Inertial, gravity |
| Answer» B. Buoyancy, pressure | |
| 762. |
Two dimensional flows occurs when? |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» E. | |
| 763. |
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called? |
| A. | Adhesion |
| B. | Cohesion |
| C. | Viscosity |
| D. | Compressibility |
| Answer» B. Cohesion | |
| 764. |
The stress-strain relation of the Newtonian fluid is? |
| A. | Linear |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Inverse type |
| Answer» B. Parabolic | |
| 765. |
The purpose of a surge tank is? |
| A. | To control the pressure variations due to rapid changes in the pipe line flow |
| B. | To eliminate water hammer possibilities |
| C. | To regulate flow of water to turbines by providing necessary retarding head of water |
| D. | All of the above |
| Answer» E. | |
| 766. |
Mercury does not wet glass. This is due to property of liquid known as? |
| A. | Adhesion |
| B. | Cohesion |
| C. | Surface tension |
| D. | Viscosity |
| Answer» D. Viscosity | |
| 767. |
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 | |
| 768. |
Water is _________ liquid. |
| A. | A compressible |
| B. | An incompressible |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 769. |
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 | |
| 770. |
The sheet of water flowing over a notch or a weir is known as |
| A. | Sill or crest |
| B. | Nappe or vein |
| C. | Orifice |
| D. | None of these |
| Answer» C. Orifice | |
| 771. |
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 | |
| 772. |
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity |
| A. | One-half |
| B. | One-third |
| C. | Two-third |
| D. | Three-fourth |
| Answer» C. Two-third | |
| 773. |
Which of the following pump is successfully used for lifting water to the turbines? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air lift pump |
| Answer» D. Air lift pump | |
| 774. |
The viscosity of water is __________ than that of mercury. |
| A. | Higher |
| B. | Lower |
| C. | Same as |
| D. | None of these |
| Answer» B. Lower | |
| 775. |
In an outward flow reaction turbine |
| A. | The water flows parallel to the axis of the wheel |
| B. | The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel |
| C. | The water enters the wheel at the outer periphery and then flows towards the centre of the wheel |
| D. | The flow of water is partly radial and partly axial |
| Answer» C. The water enters the wheel at the outer periphery and then flows towards the centre of the wheel | |
| 776. |
Reynold's number is the ratio of inertia force to |
| A. | Pressure force |
| B. | Elastic force |
| C. | Gravity force |
| D. | Viscous force |
| Answer» E. | |
| 777. |
Hydraulic accumulator is used for |
| A. | Accumulating oil |
| B. | Supplying large quantities of oil for very short duration |
| C. | Generally high pressures to operate hydraulic machines |
| D. | Supplying energy when main supply fails |
| Answer» E. | |
| 778. |
The specific gravity of an oil whose specific weight is 7.85 kN/m3, is |
| A. | 0.8 |
| B. | 1 |
| C. | 1.2 |
| D. | 1.6 |
| Answer» B. 1 | |
| 779. |
In impulse Turbine, energy available at the inlet is in the form of |
| A. | Potential Energy |
| B. | Strain Energy |
| C. | Kinetic energy |
| D. | None of these |
| Answer» D. None of these | |
| 780. |
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is$ |
| A. | ω.r/2g |
| B. | ω².r²/2g |
| C. | ω.r/4g |
| D. | ω².r²/4g |
| Answer» C. ≈ì√¢.r/4g | |
| 781. |
The value of coefficient of discharge is __________ the value of coefficient of velocity. |
| A. | Less than |
| B. | Same as |
| C. | More than |
| D. | None of these |
| Answer» B. Same as | |
| 782. |
The unit of kinematic viscosity in S. I. units is |
| A. | N-m/s |
| B. | N-s/m2 |
| C. | m2/s |
| D. | N-m |
| Answer» D. N-m | |
| 783. |
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to |
| A. | 1/2 √ó depth |
| B. | 1/2 √ó breadth |
| C. | 1/2 √ó sloping side |
| D. | 1/4 √ó (depth + breadth) |
| Answer» B. 1/2 ‚àö√≥ breadth | |
| 784. |
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by |
| A. | l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²) |
| B. | l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³) |
| C. | l/d‚Å¥ = (l‚ÇÅ/d‚ÇÅ‚Å¥) + (l‚ÇÇ/d‚ÇÇ‚Å¥) + (l‚ÇÉ/d‚ÇÉ‚Å¥) |
| D. | l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵) |
| Answer» E. | |
| 785. |
The Cipoletti weir is a __________ weir. |
| A. | Rectangular |
| B. | Triangular |
| C. | Trapezoidal |
| D. | Circular |
| Answer» D. Circular | |
| 786. |
When the flow parameters at any given instant remain same at every point, then flow is said to be |
| A. | Quasi-static |
| B. | Steady state |
| C. | Laminar |
| D. | Uniform |
| Answer» E. | |
| 787. |
The cavitation in a hydraulic machine |
| A. | Causes noise and vibration of various parts |
| B. | Reduces the discharge of a turbine |
| C. | Causes sudden drop in power output and efficiency |
| D. | All of the above |
| Answer» E. | |
| 788. |
Bulk modulus of a fluid __________ as the pressure increases. |
| A. | Remain same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 789. |
When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be |
| A. | Horizontal |
| B. | Nearly horizontal |
| C. | Steep |
| D. | First rise and then fall |
| Answer» D. First rise and then fall | |
| 790. |
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. 0.5v¬¨‚â§/2g | |
| 791. |
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. | |
| 792. |
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 | |
| 793. |
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 | |
| 794. |
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% | |
| 795. |
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 | |
| 796. |
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 | |
| 797. |
The velocity at which the flow changes from laminar flow to turbulent flow is called |
| A. | Critical velocity |
| B. | Velocity of approach |
| C. | Sub-sonic velocity |
| D. | Super-sonic velocity |
| Answer» B. Velocity of approach | |
| 798. |
A submerged body is said to be in a stable equilibrium, if its centre of gravity __________ the centre of buoyancy. |
| A. | Coincides with |
| B. | Lies below |
| C. | Lies above |
| D. | None of these |
| Answer» C. Lies above | |
| 799. |
The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water. |
| A. | Equal to |
| B. | One-half |
| C. | Three fourth |
| D. | Double |
| Answer» E. | |
| 800. |
The length of the divergent cone in a Venturimeter is __________ that of the convergent cone. |
| A. | Equal to |
| B. | Double |
| C. | Three to four times |
| D. | Five to six times |
| Answer» D. Five to six times | |