Engineering Answers

What is the critical speed(RPM) of the ball mill, if the diameter of the ball mill=500 mm and diameter of the ball 80 mm

A) 65

B) 75

C) 45

D) 55

E) 35

What should be the diameter (mm) of set rolls which accepts feed equivalent to spheres of 50 mm in diameter and crush them to spheres having in diameter of 15 mm? Here the co-efficient friction is 0.30

A) 250

B) 500

C) 600

D) 750

E) None of these

Name the chemical used in stokes law experiment ?

Find the charge q(t) flowing through an element if the current is

i(t) = 3e

−t + 20 cos(15t − π

6

⁄ )uA

q(0) = 1uC

When the cold junction of a thermocouple thermometer is at 0oC and the hot junction at 100

oC, the millivoltmeter shows a deflection of 4.2 mV towards the left. The cold junction is now

put in an unknown temperature while maintaining the hot junction at 100oC. The

millivoltmeter now shows a deflection of 5.2 mV towards the right. Calculate the unknown

temperature