Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

1. 

The specific gravity of an oil whose specific weight is 7.85 kN/m3, is

[A]. 0.8
[B]. 1
[C]. 1.2
[D]. 1.6

Answer: Option A

Explanation:

No answer description available for this question.

Swam said: (Nov 14, 2013)  
7.85*10^3/9.81*10^3 = 0.8.

Maniakanta Ghosh said: (Apr 8, 2014)  
Specific weight of oil/specific weight of water.

I) SPECIFIC WEIGHT OF WATER = 9.81 KN/m3.

7.85 /9.81 = 0.8 unit less.

Williams Tosin said: (Apr 5, 2015)  
Wow nice workings.

Saravanan said: (Jun 13, 2016)  
Thanks for explaining the solution.

Ravi said: (Jan 23, 2017)  
Thank you for the explanation.

Saranya said: (Mar 17, 2017)  
Thank you for all your explanation.

Kiran said: (Oct 26, 2017)  
I Did not understand this.

Subhajit Pamja said: (Jan 18, 2018)  
Specific Wt=wt /unit volume
= w/v= mg/v.

We can say m/v *g and that is = rho(p)* g
Given, oil specific wt (pg)=7.85 KN/m^3.
And we have specific gravity= sp.wt of the liquid/sp.wt of pure water at 4°c.
So, specific Wt. Of water =9.81kN/m^3.
And the and is 7.8/9.81=0.79=>0.8(unitless).

Ganesh said: (Feb 11, 2018)  
Thanks for the explanation.

Ashok said: (Apr 2, 2018)  
Specific weight=ρ*g=7.85*100.

=>ρ=(7.85*1000)/9.81=800.
Sp.gravity=density of oil/density of water,
=800/1000=0.8.

Ekene Stanley said: (Apr 15, 2018)  
Specific weight = 7.85kn/m^3,
The density of water = 9.81,
weight/volume,
7.85÷9.81 = 0.8anwser.

Harsh Shukla said: (May 2, 2019)  
Specific gravity or relative density = W1/W2.
W1 = specific weight of given liquid = 7.85 KN/m3.
W2 = specific weight of standard liquid (Water) = 9.81KN/m3.
W1/W2 = 7.85/9.81 = 0.8.

Akashdeep Singh said: (Jul 20, 2019)  
The formula of specific gravity:

= Specific weight of liquid/ specific weight of pure water at standard temperature.

The specific weight of water =9.81 KN/m^3.
Then according to formula:
7.85/9.81 = 0.8 Ans.

Vimal Gautam said: (Apr 30, 2020)  
Thanks all for the explanation.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.