Select the correct answer from each drop-down menu. What are the characteristics of section lines?
If the object’s main edges itself are at ↓ then you can use lines drawn at 30 or 60 degree. The spacing should be uniform ranging from ↓ depending on the size of the drawing.

First drop down menu
A. 30 degrees
B. 45 degrees
C. 180 degrees

Second drop down menu
A. 1.5 mm to 6 mm
B. 2.5 mm to 3 mm
C. 0.5 mm to 1.5 mm

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?