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3 years ago

Before charging a system that has been opened for service

Engineering

1 answer:

Katen [24]3 years ago

8 0

Explanation:

Shut the air condioner and blower motor off and wait for the refrigerant to accumulate. ... After a system has been opened for repair, the system should be properly leak tested before charging with refrigerant. The system should hold a deep vacuum (27 in HG. or more) for at least one minute before charging.

https://www.escogroup.org › ...

PDF

Federal Clean Air Act Section 609 Training Manual ... - ESCO Institute

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Two vertical, parallel clean glass plates are spaced a distance of 2mm apart. if the plates are placed in water, how high will t

Ulleksa [173]

Answer with Explanation:

The capillary rise in 2 parallel plates immersed in a liquid is given by the formula

$h=\frac{2\sigma cos(\alpha )}{\rho gd}$

where

$\sigma$ is the surface tension of the liquid

$\alpha$ is the contact angle of the liquid

$\rho$ is density of liquid

'g' is acceleratioj due to gravity

'd' is seperation between thje plates

Part a) When the liquid is water:

For water and glass we have

$\sigma =7.28\times 10^{-2}N/m$

$\alpha =0$

$\rho _{w}=1000kg/m^3$

Applying the values we get

$h=\frac{2\times 7.28\times 10^{-2}cos(0)}{1000\times 9.81\times 2\times 10^{-3}}=7.39mm$

Part b) When the liquid is mercury:

For mercury and glass we have

$\sigma =485.5\times 10^{-3}N/m$

$\alpha =138^o$

$\rho _{w}=13.6\times 10^{3}kg/m^3$

Applying the values we get

$h=\frac{2\times 485.5\times 10^{-3}cos(138)}{13.6\times 1000\times 9.81\times 2\times 10^{-3}}=-2.704mm$

The negative sign indicates that there is depression in mercury in the tube.

4 0

3 years ago

Given a force of 72 lbs at a distance of 15 ft, calculate the moment produced.

Elis [28]

Answer:

1425.78 N.m

Explanation:

Moments of force is calculated as ;

Moments= Force * distance

M= F*d

The S.I unit for moment of force is Newton-meter (N.m)

Given in the question;

Force = 72 lbs

1 pound = 4.45 N

72 lbs = 4.45 * 72=320.4 N

Distance= 15 ft

1ft= 0.3048 m

15 ft = 15*0.3048 = 4.57 m

d= 4.57 m

M= F*d

M=320.4*4.57 =1425.78 N.m

5 0

4 years ago

Mobility refers to the ability to?

aev [14]

Answer:

Drive

Explanation:

Drive is a great example

4 0

3 years ago

When nondeterminism results from multiple threads attempting to access a shared resource such as a shared variable or a shared f

Sindrei [870]

Answer:

a) True

Explanation:

In Computer programming, when a multiple thread is executing, the sequence in which the statements (codes) contained therein are executed by these multiple thread is mainly nondeterministic in nature.

When nondeterminism results from multiple threads attempting to access a shared resource such as a shared variable or a shared file, at least one of the accesses is an update, and the accesses can result in an error, we have a race condition.

A race condition can be defined as a condition in which multiple threads have the ability to access shared data at the same time and as such they both try to change (modify) the data. Thus, in a race condition occurs in computer (software) programming when a software application's behavior is solely dependent on the timing of multiple threads (processes) in order to function properly.

6 0

3 years ago

A car enters a circular off ramp (radius of 180 m) at 30 m/s. The car's on - bond accelerometers sense a total acceleration magn

o-na [289]

Answer:

Horizontal acceleration will be $2.07m/sec^2$

Explanation:

We have given radius of track = 180 m

velocity = 30 m/sec

Total acceleration $a_t=7.07m/sec^2$

The centripetal;l acceleration which is always normal to the velocity also known as normal acceleration is given by $a_n=\frac{v^2}{r}=\frac{30^2}{180}=5m/sec^2$

So the tangent acceleration will be $a_t=7.07-5=2.07m/sec^2$

5 0

3 years ago