Mechanical Engineering Questions And Answers

21⟩ What is the main purpose of an airspeed indicator in an aircraft?

The primary purpose of an airspeed indicator in an aircraft is to give the pilot some sense of how fast the aircraft is moving. A pitot tube, which is a forward pointing hollow tube that is mounted on the plane, is pressurized by the force of the air the plane encounters as it flies. This air pressure is compared to a static reference, and the difference is proportional to the airspeed. The faster the plane moves, the higher the pressure in the Pitot tube, and the greater the difference between that and the reference. All that will result in higher indicated air speed. There are some issues associated with the accuracy of the system (like when the plane is flying into a headwind), and information on. The pictures are informative, and a reader can pick up a handful of specialized terms relating to the device and the principles upon which it operates.

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22⟩ What does F.O.F. stand for in piping design?

FOF stands for Face of Flange. A flange has either of the two types of faces:

* a) Raised face

* b) Flat face

The F.O.F is used to know the accurate dimension of the flange in order to avoid the minute errors in measurement in case of vertical or horizontal pipelines.

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23⟩ What is a uniformly distributed load?

A UDL or uniformly distributed load is a load, which is spread over a beam in such a way that each unit length is laded to the same extent.

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24⟩ What is enthalpy?

Enthalpy is the heat content of a chemical system.

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25⟩ What is the gas constant R for air?

Air gas constant is Rair=R/28.97=0.2869 (J/g K) = 286.9 (J/kg K)

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26⟩ What are the thermal conductivity properties of brass?

109 W/ (m*K) @ 300K

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27⟩ How does a Coal Power station produce electricity?

A fossil fuel power plant (FFPP) (also known as steam electric power plant in the US, thermal power plant in Asia, or power station in the UK) is an energy conversion center designed on a large scale for continuous operation. Just as a battery converts relatively small amounts of chemical energy into electricity for temporary or intermittent use, the FFPP converts the energy stored in fossil fuels such as coal, oil, or natural gas successively into thermal energy, mechanical energy, and finally electric energy for continuous use and distribution across a wide geographic area.

Usually, the coal is utilized to convert water into steam in boilers (thermal energy). The steam is then used to drive steam turbines (mechanical energy). The turbine shaft is coupled to a generator shaft, which generates electricity.

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28⟩ What is the full form of WCB in ASTM?

American Society for Testing and Matreails

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29⟩ What is the alloy of tin and lead?

A tin and lead alloy is commonly called solder. Usually solder is a wire with a rosin core used for soldering. The rosin core acts as a flux.

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30⟩ What is jet plane?

An aircraft powered by a jet engine.

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31⟩ How does length and initial angle affect the period in a simple pendulum?

The longer the pendulum is the greater the period of each swing. If you increase the length four times, you will double the period.

It is hard to notice, but the period of a pendulum does depend on the angle of oscillation. For small angles, the period is constant and depends only on the length of the pendulum. As the angle of oscillation (amplitude) is increased, additional factors of a Taylor approximation become important. (T=2*pi*sqrt (L/g) [1+theta^2/16+...] and the period increases.

Interestingly, if the pendulum is supported by a very light wire then the mass of the object at the end of the pendulum does not affect the period. Obviously, the greater the mass, the less any air friction, or friction at the pivot will slow the pendulum. Also interestingly, the pendulum period is dependant on the force of gravity on the object (g). One must not assume that g is constant for all places on Earth.

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32⟩ What is the difference between shear center flexural center of twist and elastic center?

The shear center is the centroid of a cross-section. The flexural center is the center of twist, which is the point on a beam that you can add a load without torsion. The elastic center is located at the center of gravity. If the object is homogeneous and symmetrical in both directions of the cross-section then they are all equivalent.

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33⟩ Is shear thinning fluids and the linear viscoelastic fluids are the same?

No

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34⟩ What is the difference between the flight of a plane and a helicopter?

Both use the pressure difference caused by air moving over the wings at different speeds to generate lift a plane by moving those wings in the direction of travel, a helicopter by spinning the "wings" around at high speed.

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35⟩ What kinds of pipes are used for steam lines?

Normally galvanized pipes are not used for steam. Mild steel with screwed or welded fittings are the norm. Pressure and temperature are very important factors to be considered in what type of materials to be used. Steam even at low pressures can be extremely dangerous.

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36⟩ What is the difference between projectile motion and a rocket motion?

A projectile has no motor/rocket on it, so all of its momentum is given to it as it is launched. An example of a projectile would be pen that you throw across a room.

A rocket or missile does have a motor/rocket on it so it can accelerate itself while moving and so resist other forces such as gravity.

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37⟩ What is ferrite?

Magnetic iron rock

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38⟩ What is a pneumatic system?

Pneumatic system is a system that uses air to power something. For instance, have you seen the tube systems at bank drive-up tellers? Air is used to push the tubes back and forth from the teller to the customer.

Air is also used to power drills, sanders, grinders, and the like at garages and car body shops.

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39⟩ Does the position of a chicken egg affect the amount of weight it can withstand?

Yes. Lying on its side, it will break with very little pressure. That is why, when you break an egg, you always strike the side.

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40⟩ What is a cotter joint?

These types of joints are used to connect two rods, which are under compressive or tensile stress. The ends of the rods are in the manner of a socket and shaft that fit together and the cotter is driven into a slot that is common to both pieces drawing them tightly together. The tensile strength of the steel is proportionate to the strength needed to offset the stress on the material divided by the number of joints employed.

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Mechanical Engineering

Home Engineering Mechanical Engineering

164 Mechanical Engineering Questions And Answers

21⟩ What is the main purpose of an airspeed indicator in an aircraft?

22⟩ What does F.O.F. stand for in piping design?

23⟩ What is a uniformly distributed load?

24⟩ What is enthalpy?

25⟩ What is the gas constant R for air?

26⟩ What are the thermal conductivity properties of brass?

27⟩ How does a Coal Power station produce electricity?

28⟩ What is the full form of WCB in ASTM?

29⟩ What is the alloy of tin and lead?

30⟩ What is jet plane?

31⟩ How does length and initial angle affect the period in a simple pendulum?

32⟩ What is the difference between shear center flexural center of twist and elastic center?

33⟩ Is shear thinning fluids and the linear viscoelastic fluids are the same?

34⟩ What is the difference between the flight of a plane and a helicopter?

35⟩ What kinds of pipes are used for steam lines?

36⟩ What is the difference between projectile motion and a rocket motion?

37⟩ What is ferrite?

38⟩ What is a pneumatic system?

39⟩ Does the position of a chicken egg affect the amount of weight it can withstand?

40⟩ What is a cotter joint?

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Mechanical Engineering

Home Engineering Mechanical Engineering

164 Mechanical Engineering Questions And Answers

21⟩ What is the main purpose of an airspeed indicator in an aircraft?

22⟩ What does F.O.F. stand for in piping design?

23⟩ What is a uniformly distributed load?

24⟩ What is enthalpy?

25⟩ What is the gas constant R for air?

26⟩ What are the thermal conductivity properties of brass?

27⟩ How does a Coal Power station produce electricity?

28⟩ What is the full form of WCB in ASTM?

29⟩ What is the alloy of tin and lead?

30⟩ What is jet plane?

31⟩ How does length and initial angle affect the period in a simple pendulum?

32⟩ What is the difference between shear center flexural center of twist and elastic center?

33⟩ Is shear thinning fluids and the linear viscoelastic fluids are the same?

34⟩ What is the difference between the flight of a plane and a helicopter?

35⟩ What kinds of pipes are used for steam lines?

36⟩ What is the difference between projectile motion and a rocket motion?

37⟩ What is ferrite?

38⟩ What is a pneumatic system?

39⟩ Does the position of a chicken egg affect the amount of weight it can withstand?

40⟩ What is a cotter joint?

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