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3 years ago

Which of the following statements is correct?

Engineering

1 answer:

Reika [66]3 years ago

3 0

Answer:

b. rivets are tempory fasteners that bind two plate of metals together

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A journeyman electrician with 16 years experience on-the-job was removing metal fish tape from a hole at the base of a metal lig

Romashka-Z-Leto [24]

Answer: He should have ensured the following before beginning work;

1) All circuits must be de-energized before beginning work

2) All controls must be deactivated during work. LOTO(Log out tag out) must be practiced irrespective of the experience of the electrian or worker.

3) Technicians and Electrical workers must be instructed to know the unsafe conditions associated with their work.

Explanation:

We cannot assume that because he is experienced he cannot be prone to all this wrong practices. Humans tend to think that with experience people become less prone to errors and study has shown that this is not true. Safety must be a priority.

5 0

3 years ago

Three spheres are subjected to a hydraulic stress. The pressure on spheres 1 and 2 is the same, and they are made of the same ma

r-ruslan [8.4K]

Answer:

"150000 N/m²" is the right approach.

Explanation:

According to the question, the pressure on the two spheres 1 and 2 is same.

Sphere 1 and 2:

Then,

⇒ $P_1=P_2$

⇒ $\frac{\Delta V_1}{V_1}=\frac{\Delta V_2}{V_2}$

and the bulk modulus be,

⇒ $B_1=B_2$

Sphere 3:

⇒ $\frac{\Delta V_3}{V_3} =\frac{\frac{\Delta V_1}{V_1} }{\frac{\Delta V_2}{V_2} } =1$

then,

⇒ $P_3=B\times \frac{\Delta V_3}{V_3}$

⇒ $=B\times 1$

⇒ $=150000\times 1$

⇒ $=150000 \ N/m^2$

5 0

3 years ago

Special considerations must be given to systems using liquid hydrogen for fuel because of: A. Liquid hydrogen's low density B. L

vitfil [10]

Answer:

D.All of the above

Explanation:

Properties of hydrogen:

1.It is lighter than air.It has density about 0.089 g/L.

2.Hydrogen rapidly change from liquid state to gas,so special protection is required to protect it.

3.It is highly flammable gas.

4.Liquid form of hydrogen exits at -432 F .This is very low temperature so special protection requires to keep it in liquid form.

6 0

3 years ago

Describe what viscoelastic behavior means

Bezzdna [24]

This refers to the mechanical properties of the materials tested by means of a stress stimulus or deformation. The mechanical behavior of a material will depend on its viscosity / elasticity characteristics. Depending on the response to mechanical stimulus, the material may be classified as elastic or viscous. For a perfectly elastic or Hookian solid the deformation is proportional to the applied stress. A viscous material obeys Newton's law, which states that stress and shear rate are related through an intrinsic characteristic that is viscosity.

However, there are materials that correspond to both properties. Polymers have an intermediate mechanical behavior to elastic and viscous, being called viscoelastic. The elastic and viscous contribution to the mechanical behavior of the polymer depends on the temperature and time scale of the experiment.

5 0

3 years ago

an amplifier has an input resistance of 100k a short-circuit transconductance of 10 mA/V and an output resistance of 100k. Find

Vlada [557]

Answer:

The open circuit voltage gain is $A_{vo}=-10^{3}$