Engineering Answers

A material has a volume of 1m3 and a mass of 2400kg in natural state. The volume of its

pores accounts for 25%. Calculate its density.

Find the charge flowing q(t) through a device if the current is i(t) = 10 e-30t sin 40t A,

q(0) = 0

0.15 gm of calcium carbonate is dissolved in 1 liter of distilled water. 20 ml of this

standard hard water requires 25 ml of EDTA solution. 100 ml of unknown hard water requires 18 ml of EDTA solution. The same water sample after boiling requires 12 ml of EDTA solution. Calculate Temporary hardness of water sample in ppm.

Standard hard water is prepared by dissolving 0.28 gm of calcium carbonate in dilute HCI

and then diluted to 1 liter with distilled water. 100 ml of this standard hard water requires 28 ml of EDTA solution. 100 ml of unknown hard water requires 33 ml of EDTA solution. 100 ml of same water sample after boiling requires 10 ml of EDTA solution. Calculate Total, Permanent and Temporary hardness of water sample

0.45 gm of calcium carbonate is dissolved in 1 liter of distilled water. 50 ml of this

standard hard water requires 20 ml of EDTA solution. 50 ml of unknown hard water requires 12 ml of EDTA solution. 50 ml of same water sample after boiling requires 8 ml of EDTA solution. Calculate Total, Permanent and Temporary hardness of water sample

1 gm of calcium carbonate is dissolved in dilute HCl and diluted to 1 liter with distilled

water. 100 ml of this standard hard water requires 90 ml of EDTA solution. 100 ml of unknown hard water requires 36 ml of EDTA solution. 100 ml of same water sample after boiling requires 18 ml of EDTA solution. Calculate Carbonate and Non-carbonate hardness of water sample.

0.75 gm of calcium carbonate is dissolved in 1 liter of distilled water. 100 ml of this

standard hard water requires 25 ml of EDTA solution. 100 ml of unknown hard water requires 15 ml of EDTA solution. 100 ml of same water sample after boiling requires 10 ml of EDTA solution. Calculate Total, Permanent and Temporary hardness of water sample.

An Aluminium Alloy roller with diameter 25mm and length 50mm rolls on the inside of a cast iron ring

having an inside radius of 100mm, which is 50mm thick. Find the maximum force ‘F’ that can be used if

the maximum pressure is not exceeding 100 Mpa.

A fit or assembly of pin and hole is designated by 55mm H9/d9/

a) Describe what kind of fit it is.

b) Find: i)tolerances for pin & hole ii) Deviations (Upper, Lower and Fundamental) for both hole and pin

iii) The maximum, minimum, mean and most frequent clearances.(hint: mean is the most frequent value

in normal distribution)

c) Neatly sketch the fit/assembly in a graph paper and show all the pertinent dimensions

d) Assume the natural spread and tolerance coincide for both shaft and hole. What % of fit was less than

the minimum clearance?

(find σ for shaft, hole and clearance. For the σ of clearance, use the population combination formula

mentioned in the study material named statistical considerations)

a shaft manufacturer has produced 500 ms pipes of nominal outside diameter of 150mm. measurement show the maximum diameter to be 151.1mm while minimum diameter to be 149.3mm. hoever during shipment pipes of diameter 150+-0.5mm were accepted and the rest were rejected.assume gaussian/normal distribution.