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## Product description

Theoretical questions.

8.Osnovnye requirements for lighting jobs. Basic lighting value. The principles of valuation and the basis of calculation of natural lighting

13.Mery noise control in the workplace. Cases of application of the method of sound insulation and sound absorption. The formulas for the calculation.

22.Trebovaniya safety for vessels under pressure. Their installation, registration and technical inspection. Basic requirements for tanks and barrels for liquefied gases. Test and Measurement

32.Osnovnye fire protection requirements to be observed in the design of the rolling stock and railway facilities.

Target 10 (option 4)

Make a calculation of the gate air curtains in the shop repair of rolling stock.

Initial data taken according to an embodiment, the number of which coincides with the last digit of the sum of digits of the school code number.

Notes to the problem:

1. Draw a diagram of the calculated air curtain.

2. The coefficient of turbulent jets take equal 0.2

3. Set the value which characterizes the air throw of the air curtain

4. For the channel width of the gap through which air is drawn into the air curtain

5. Identify:

a) the amount of outside air entering the plant in the absence of air curtains

b) the amount of cold outside air entering the shop with the device air curtains

c) the amount of air required for the air curtains

d) the rate of release of air from the jet slots

d) the mean temperature of the air entering the plant

6. Draw conclusions.

Initial data:

Height A = 6.5 m

B = width of 6 m.

The average speed of the air (wind) - 3.3 m / s

Average temperature:

A) in the upper zone management 21 0C

B) of the outer -10 0C

The angle at which the air stream is directed towards the cold air - 45

Target 13.

Set the heating time (in the fire) before the critical temperature zone valves stretched odnoprolёtnogo free opёrtogo overlap workshop depot.

Initial data taken according to an embodiment, the number of which coincides with the last digit of the sum of digits of the school code number.

Notes to the problem:

1. Take:

a) standard mode of heat exposure

b) class and brand reinforcing steel yourself

c) for the received class and brand reinforcement critical temperature

2. Define:

a) the density of dry concrete

b) the mean calculated values \u200b\u200bof thermal characteristics

c) the values \u200b\u200bof the coefficients K and K1

d) the starting time of heating to the critical temperature of reinforcement plate

3. Draw conclusions.

Initial data:

Reinforced concrete slab with a density kg / m3

Relative humidity of material%

The initial temperature of the plate 0C.

The thickness of the protective layer of concrete 0,030 m.

Mm diameter rebar.

References

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