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Topics - mechanic

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1711
Mechanical Engineering / what is Isothermal Process?
« on: June 19, 2015, 12:56:10 PM »
If the temperature of the system remain constant throughout the process, it is called an Isothermal process.

1712
Mechanical Engineering / What is Isochoric Process?
« on: June 19, 2015, 12:54:36 PM »
Isochoric process is defined as that process in which the volume of the system remains constant.

1713
Mechanical Engineering / What is Isobaric Process?
« on: June 19, 2015, 12:51:25 PM »
Isobaric Process is that process which takes place at constant pressure.

1714
Mechanical Engineering / Bimetallic Thermometer
« on: June 19, 2015, 12:48:46 PM »
A bimetallic strip can be used to make a thermometer. In this case the bimetallic strip often is in the form of coil. its one end is fixed and the other end is attached to a pointer as shown in fig.


This kind of thermometer is usually used for ordinary air thermometer. oven thermometer and is automobiles for automatic shoke.

1715
Mechanical Engineering / Bimetallic Thermostat
« on: June 19, 2015, 12:43:09 PM »
One of the example of thermal expansion is of thermostat devices. Thermostats are well known devices commonly used for maintaining required temperatures.

A common type of thermostat called bimetallic thermostat. The bimetallic strip works as an electric contact breaker in an electrical heating circuit.

1716
Mechanical Engineering / List of average values of common solids
« on: June 19, 2015, 12:36:54 PM »
Table 11.1 from Physics (XII)


1717
Mechanical Engineering / What is Linear Expansion?
« on: June 19, 2015, 12:16:17 PM »
Linear Expansion: Expansion in length of solids on heating is called linear expansion. The observed expansion in length depends upon the original length and the change in temperature.
It has been found experimentally that the change in length is directly proportional to the original length and the change in temperature of the solid.

1718
Mechanical Engineering / What is Thermal Expansion?
« on: June 19, 2015, 12:13:21 PM »
Thermal Expansion: In general bodies undergo change in size when they are heated. This change in size on heating is termed Thermal Expansion.
Solids, when heated show increase in length, area or volume. Whereas liquids and gases expand in volume.
The property of thermal expansion varies from substance to substance. when solid is heated, its molecules vibrate more energetically against the action of inter molecular forces producing greater displacement.

1719
Mechanical Engineering / Thermometric Properties [Physics]
« on: June 18, 2015, 10:19:41 PM »
Definition: Property of substance which changes uiformly with the change of temperature is named thermometric property.
Forexample: the volume of the liquid in a vessel, the volume of a fixed mass of gas kept at constant pressure, the pressure of fixed massof gas maintained at constant volume, electrical resistance of metal are some of the many measureable physical properties which changes with the change of temperature.

1720
Entrance Test Schedule announced for the admission in University of Engineering and Technology, Peshawar for the session 2015-16.

full details attached in attachment.

1721
Professor, Associate Professor and Assistant professor jobs in QUEST Nawabshah on 17-6-2015
Cutting from daily dawn is attached

1722
General Discussion / Which company is owned by Bill Gates
« on: June 15, 2015, 01:01:35 PM »
Which company is owned by Bill Gates

Answer is:Microsoft

1723
General Discussion / Which country grows the most fruit
« on: June 15, 2015, 12:44:50 PM »
Which country grows the most fruit

Answer is: China

1724
General Discussion / Ringo Star narrates which children's TV series
« on: June 15, 2015, 12:42:44 PM »
Ringo Star narrates which children's TV series

Answer is : Thomas the tank engine

1725
General Discussion / What in business terms is the IMF
« on: June 15, 2015, 12:39:20 PM »
What in business terms is the IMF

Answer is: International Monetary Fund

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