Explanation

Liquids, such as water, oil, and mercury, are incompressible fluids.

Fluids include gases, which are compressible fluids,

And liquids, which are incompressible or are only slightly compressible.

Explanation

i. Motor and ii. Turbines are both examples of drivers.

A Gas Compressor (iii) is a piece of equipment that is driven, not a driver itself. 

Motor (Driver):

An electric motor is a common driver for a gas compressor, especially for low-to-medium power requirements

Turbine (Driver):

Both gas and steam turbines are used as drivers, especially for large, high-power industrial applications like those found in oil and gas production.

Explanation

Annealing is carried out to soften the metal.

It makes the metal more suitable for cold working and forming.

It also enhances the metal's machinability, ductility, and toughness.

Annealing is also useful in relieving stresses in the part caused due to prior cold working processes

Explanation

If the area reduces, the velocity increases, and the pressure decreases. 

This is based on the principle of continuity in fluid dynamics,

This states that the mass flow rate of a fluid remains constant in a closed system.

When the area of a pipe decreases, the fluid must flow faster to maintain the same flow rate, increasing velocity.

Explanation

Addendum:

The radial height of a gear tooth is measured from the pitch circle to the addendum circle (the outermost circle that defines the tooth tips).

Additional information:

Pitch Circle:

A theoretical circle on a gear where the gear and a mating gear are considered to be in pure rolling contact.

The pitch diameter is the diameter of this circle.

Outside Diameter (O.D.):

The diameter of the addendum circle, which encompasses the tips of the gear teeth.

Dedendum:

The radial depth of a gear tooth is measured from the pitch circle to the root circle (the circle defining the bottom of the tooth spaces). 

Explanation

Ball bearings can be used to support radial loads, axial loads, and a combination of both, depending on the specific bearing design.

Therefore, option iii, "Both ends," is the most accurate answer. 

Additional information:

Deep-groove ball bearings:

This is the most common type and can handle both moderate radial loads (perpendicular to the shaft) and light axial or thrust loads (parallel to the shaft).

Angular contact ball bearings:

These bearings are designed with races that are offset relative to each other, allowing them to support heavy combined radial and axial loads.

Thrust ball bearings:

This type of bearing is designed specifically to accommodate heavy axial loads and can only support very little, if any, radial load. 

Explanation

In a spur gear system, the shaft is parallel to the gear.

Spur gears are specifically designed for applications where power is transmitted between parallel and coplanar shafts. 

Explanation

"Combustion of methane" is an example of an exothermic reaction. 

Photosynthesis:

This is an endothermic reaction, meaning it absorbs energy from sunlight to produce glucose. 

Decomposition of calcium carbonate:

This is also an endothermic reaction, as it requires energy to break down calcium carbonate into calcium oxide and carbon dioxide. 

Electrolysis of water:

This is an endothermic reaction where electricity is used to split water into hydrogen and oxygen. 

Explanation

 Oxy-acetylene welding:

This is the most common type of gas welding, where oxygen and acetylene are mixed to produce a high-temperature flame that melts the metal pieces to be joined. 

Additional information:

ii. (Acetylene + Carbon):

While acetylene is a key component in gas welding, it needs oxygen to create the combustion necessary for the welding process.

Carbon alone doesn't provide the necessary oxidation. 

iii. (Oxygen + Hydrogen):

Although oxygen is used in welding, hydrogen is not typically used in this context.

Hydrogen and oxygen can form water vapor, which could hinder the welding process. 

Explanation

Stainless steel has the best corrosion resistance property. 

Stainless steel:

Due to its high chromium content, stainless steel forms a protective oxide layer on its surface when exposed to oxygen, significantly resisting corrosion. 

Aluminum steel:

While aluminum also forms a protective oxide layer, it is not as resistant to corrosion as stainless steel. 

Carbon steel:

Carbon steel lacks sufficient chromium and is highly susceptible to rusting.