I pretty sure it would be A
Answer:

Explanation:
Let assume that heating process occurs at constant pressure, the phenomenon is modelled by the use of the First Law of Thermodynamics:

The specific enthalpies are:
Liquid-Vapor Mixture:

Saturated Vapor:

The thermal energy per unit mass required to heat the steam is:


Answer:

Explanation:
Given that diameter of tube= 20 mm
flow rate = 72 lt/hr
The properties of SAE 30 oil at 30°C


We know that volume flow rate Q= AV

V= 0.064 m/s
Now lets find Reynolds number to check the type of flow


Re=7.18 So we can say that this is laminar flow and we know that pressure drop for laminar flow is given as

Now by putting the values the pressure drop for per unit length

