6. What is a Drawing ?
Ans:
It is a graphical representation
of a real thing to define and specify the shape and size of a particular object
by means of lines.
7. What is Engineering Drawing ?
Ans:
A drawing which is worked out an
engineer for the engineering purpose is known as Engineering Drawing.
8. Explain briefly the following
lines used in Engineering drawing ?
Ans:
(a)Dimension Lines
Dimension lines are the thin
lines used to indicate extents and direction of dimension. These are terminated
with arrowheads.
(b)Extension Lines
Extension lines are also thin
lines and it used to indicate the termination of a dimension.
(c)Leaders
Leaders are used to direct notes
or identification symbols to feature on the drawing.
9. Difference between 'Thermodynamics and Heat Transfer'?
Ans:
Thermodynamics mainly deals with
the transfer of energy in form of heat or work between systems and surroundings
with other systems in form of either heat or work in equilibrium conditions. When there is change in one state, which was
in equilibrium state and starting to change in other equilibrium state, this
information helps to determine heat or work interactions due to this process.
While
Heat transfer deals with non
equilibrium heat exchange or transfer due to temperature gradient while in
thermodynamics, during thermal equilibrium (No temperature gradient) no heat
exchange is possible.
10. Explain in an orderly manner how the force in the member of a truss be detected using the method of joint.
Ans:
The steps required to calculate
the force are as follows:
- The reaction at the support has to be first calculated.
- Once the reaction is calculated the direction of force of the member is made to make it tensile. On getting the result to be negative the direction assumed is wrong and this implies the force being compressive in nature.
- A joint needs to be selected whose 2 members are not known. The lami's theorem is used on the joint on which less than three forces are acting.
- After the above process is complete the free body diagrams of the joint needs to be made. Since the system is in equilibrium the condition of Summation of V and H must result in zero.
- After the above step the resolution of forces method needs to be used on the joint on which more than 4 forces are acting.
11. What is mechanism?
Ans:
A mechanism is an assembly of
different parts which perform a complete motion and is often part of a machine.
12. What is annealing?
Ans:
It is a process of heating a
material above the re-crystallization temperature and cooling after a specific
time interval. This increases the hardness and strength if the material.
13. What is ductile-brittle transition temperature?
Ans:
It is the temperature below which
the tendency of a material to fracture increases rather than forming. Below
this temperature the material loses its ductility. It is also called Nil
Ductility Temperature.
14. Difference between tempering and annealing
Ans:
Annealing is a process in which work
piece is heated up to certain temperature to get desired changes in grain or
micro-structure and then allowed to cool slowly in order to relieve the
stresses during work treatment. While tempering is a process wherein hardness
and elasticity or ductility can be regain by use of heating and cooling cycle
till desired properties can be obtained.
15. What are the advantages of
gear drive?
Ans:
Gear drive is useful for power
transmission between two shafts, which are near to each other (at most at 1m
distance). In addition, it has maximum efficiency while transmitting power. It
is durable compare to other such as belts chain drives etc. You can change the
power to speed ratio.
Advantages: -
- It is used to get various speeds in different load conditions.
- It increases fuel efficiency.
- Increases engine efficiency.
- Need less power input when operated manually.
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