Q1: A __________ type pressure sensing element is commonly used in aneroid barometer.

ANS:A - capsule

A capsule type pressure sensing element is commonly used in an aneroid barometer. Explanation:

1. Aneroid Barometer:
   • An aneroid barometer is a device used to measure atmospheric pressure without the use of liquid. It typically consists of a sealed chamber from which air has been partially evacuated. Changes in atmospheric pressure cause the flexible walls of the chamber to deform, and these deformations are measured to determine pressure.
2. Capsule Type Element:
   • In aneroid barometers, the pressure sensing element is often in the form of a capsule. A capsule is a small, flexible, hollow structure typically made of metal.
   • The capsule can expand or contract in response to changes in atmospheric pressure. As the pressure increases, the capsule contracts, and as the pressure decreases, the capsule expands.
   • The deformation of the capsule is then mechanically linked to a pointer or dial, which indicates the pressure reading.
3. Advantages of Capsule Element:
   • Capsule-type pressure sensing elements are commonly used in aneroid barometers due to their compact size, sensitivity, and ability to respond to small pressure changes accurately.
   • They are less susceptible to mechanical hysteresis and drift compared to other sensing elements like bellows or diaphragms.
   • Capsule elements are also relatively robust and can withstand moderate mechanical shocks and vibrations.
4. Application:
   • Aneroid barometers with capsule-type sensing elements are widely used in meteorology, aviation, and various industrial applications to measure atmospheric pressure.
   • They provide a convenient and reliable means of monitoring changes in atmospheric pressure, which is essential for weather forecasting, altitude measurement, and controlling industrial processes.