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3 years ago

14

A receptacle, plug, or any other electrical device whose design limits the ability of an electrician to come in contact with any

of its electrical connections is identified as _______ safe.
a. feel

b. resessed

c. touch

d. removal

1 answer:

o-na [289]3 years ago

4 0

Answer:

Recessed safe

Explanation:

A recessed, receptacle or plug is one in which the metal interfacing parts have been retracted back in such a way that common contact between a person handling the receptacle or outlet will not ordinarily lead to exposure to electric shock hazard and as such improving the safety of use of such plug, receptacle or electrical device either at home or in industrial setting

A recessed outlet is also more ideal than standard outlets where there are hazards such as potential contact with water.

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What are the causes and solutions of social problems ?what are the causes and solutions of social problems

aksik [14]

Answer:

causes: unemployment, poverty,Lack of education,urbanization e.t.c

solutions:making people educated, giving people jobs

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3 years ago

What measures can be taken to mitigate or prevent the formation of stress corrosion cracks?

sasho [114]

Answer:

a) Selection and control of material

b) Control of stress

c) Control of the environment

Explanation:

The measures that can be taken to control and prevent the formation of strss corrosion cracks are:

a) Selection and control of material

It deals with the selection of the best quality material that can resist the stress corrosion cracks to a high extent.

b) Control of stress

It is to control or reduce the intensity of the major stress that causes the stress corrosion cracks.

c) Control of the environment

It includes the prevention of the material from the corrosive environment by removing the component from the region or controlling the environment condition around the object.

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3 years ago

An aluminum alloy [E = 73 GPa] cylinder (2) is held snugly between a rigid plate and a foundation by two steel bolts (1) [E = 18

V125BC [204]

Answer:

$\sigma_A = 58.43 N/mm^2$

Explanation:

Given data:

length of Steel bolt $L_1 = 335 mm$

Length of aluminium cylinder $L_2 = 275 mm$

Pitch of bolt p = 1mm

Modulus of elasticity of steel E = 215 GPa

Modulus of elasticity of aluminium = 74 GP

Area of bolt $= \frac{\pi}{4} 14^2 = 153.93 mm^2$

Area of cylinder = 2300 mm^2

n =1

By equilibrium

$\sum F_y = 0$

$P_A -2P_S = 0$

$P_A =2P_S$

By the compatibility

$\delta _s + \delta_A = nP$

Displacement in steel is $\delta_s = \frac{P_sL_s}{E_sA_s}$

Displacement in Aluminium is $\delta_A = \frac{P_AL_A}{E_AA_A}$

from compatibility equation we have

$\frac{P_sL_s}{E_sA_s} + \frac{P_AL_A}{E_AA_A} = nP$

$\frac{P_s\times 335}{180\times 10^3\times 153.93} + \frac{P_A\times 275}{73\times 10^3\times 2300} = 1\times 1$

$1.20\times 10^[-5} P_s + 1.44\times 10^{-6}P_A = 1$

substitute $P_A =2P_S$

$1.20\times 10^[-5} P_s + 1.44\times 10^{-6} (2\times P_s) = 1$

$1.488\times 10^{-5} P_s = 1$

$P_s = 67204.30 N$

$P_A = 134,408.60 N$

Stress in Aluminium $\sigma = \frac{P_A}{A_A}$

$= \frac{134,408.60}{2300}$

$\sigma_A = 58.43 N/mm^2$

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Gina is about to use a fire extinguisher on a small fire. What factor determines the type of extinguisher she should use

amm1812

There’s 5 different types of fire extinguishers that you can differentiate by their color codes.

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Creme - Foam based

Blue - Powder based

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Yellow - Wet chemical based

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Class B - Flammable liquids ( i.e. paint, petrol, alcohol) Extinguishers to use - Creme, Blue, and Black. (Do not use Red or Yellow)

Class C - Flammable gases ( i.e. butane, methane) Extinguishers to use - Blue (Do not use Red, Creme, Black or Yellow)

Class D - Flammable metals ( i.e. lithium, potassium) Extinguishers to use - Blue (Do not use Red, Creme, Black or Yellow)

Class F - Deep fat fryers ( i.e. chip pans) Extinguishers to use - Yellow (Do not use Red, Creme, Blue or Black)

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3 years ago

Read 2 more answers