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Austin's Sheet Metal 4th Year > Formulas TQ Prep > Flashcards

Formulas TQ Prep Flashcards

1
Q

Circle

A

Area = Π r²
Perimeter = Πd

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2
Q

Cylinder

A

Volume = Π r²h

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3
Q

Rectangular

A

Volume = L x W x H
Area = L x W

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4
Q

1 Kw equals

A

1.34Hp

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5
Q

1Hp equals

A

0.745Kw

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6
Q

FPM equals

A

CFM / Area
in Square Footage

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7
Q

CFM equals

A

Area (ft²) X Velocity (fpm)

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8
Q

Area (ft²) equals

A

CFM / FPM

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9
Q

New RPM Formula

A

RPM x Increase % = New RPM

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10
Q

What is the formula for calculating belt length?

A

OC = (Dm + Df) * 1.57 + 2L.

Dm = diameter of the driving pulley, Sm = speed of the driving pulley, Df = diameter of the driven pulley, Sf = speed of the driven pulley.

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11
Q

What is the formula for calculating pulley size?

A

DM = DM x SF / Sm.

Dm = diameter of the driving pulley, Sm = speed of the driving pulley, Df = diameter of the driven pulley, Sf = speed of the driven pulley.

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12
Q

What is the formula for calculating pulley speed?

A

Dm x Sm / Df = Sf.

Dm = diameter of the driving pulley, Sm = speed of the driving pulley, Df = diameter of the driven pulley, Sf = speed of the driven pulley.

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13
Q

What is the formula for calculating a mitre in the field?

A

M=0xW/L

This formula is used for specific calculations related to mitres in various fields.

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14
Q

What is the formula for calculating double hem allowance?

A

2W minus 1/16

W represents the width of the hem

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15
Q

What formula is used for elbow heel?

A

Angle/360 x 3.14 x 2 (heel radius)

This formula calculates the arc length based on the angle and radius.

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16
Q

What formula is used for elbow throat?

A

Angle/360 x 3.14 x 2 (heel radius)

17
Q

What is the formula to calculate round duct size with area?

A

R = square root of area (square inches) / 3.14

This formula is used to determine the radius of a round duct based on its cross-sectional area.

18
Q

What is the formula to find throat or heel?

A

Rx 1.57 x Degree / 90

R is the radius, and Degree refers to the angle being measured.

19
Q

How do you calculate the radius point on an ogee?

A

(offset^2 + length^2) / (4x offset)

This formula helps in determining the curvature of the ogee design.

20
Q

What is the formula for calculating the mitre angle?

A

Angle = angle of elbow / (number of PC’s x 2) - 2

PC’s refers to the number of points of curvature.

21
Q

What is the formula for the area of a triangle?

A

1/2 x Height x Base

Height (H) is the vertical height from the base to the opposite vertex, and Base is the length of the base.

22
Q

What is the formula to convert fpm to cfm at a diffuser grill or register?

A

CFM = AK x FPM

23
Q

What is the correct formula for calculating percent of design?

A

Preliminary cfm divided by Design cfm

24
Q

What is the formula for calculating BTUh after clocking the meter?

A

Btuh = (volume test dial X 3600 / time 1 revolution) calorific value

This formula is used to determine the thermal output in BTUs based on the volume of gas measured and the calorific value.

25
Q

What is the formula for calculating hourly consumption of gas?

A

Hourly consumption = size of test dial x 3600 seconds for one full revolution of test dial

This formula helps in determining the volume of gas consumed in one hour based on the size of the test dial.

26
Q

How do you convert hourly gas consumption into BTUh?

A

BTUh = Hr consumption x Calorific value of the gas

This conversion uses the calorific value to determine the energy content of the gas.

27
Q

What is the formula to calculate watts?

A

Volts x Amps = Watts

28
Q

What is the formula for Vertical Apex?

A

VA = VHx LD / (LD - SD)

Where VA is Vertical Apex, VH is vertical height, LD is large diameter, and SD is small diameter.

29
Q

What does SOH stand for in trigonometry?

A

Sin = Opposite / Hypotenuse

• Opposite is the side opposite to the angle
• Adjacent is the side next to the angle
• Hypotenuse is the longest side of the right triangle, opposite the right angle

30
Q

What does CAH stand for in trigonometry?

A

Cosine = Adjacent / Hypotenuse

• Opposite is the side opposite to the angle
• Adjacent is the side next to the angle
• Hypotenuse is the longest side of the right triangle, opposite the right angle

31
Q

What does TOA stand for in trigonometry?

A

Tangent = Opposite / Adjacent

• Opposite is the side opposite to the angle
• Adjacent is the side next to the angle
• Hypotenuse is the longest side of the right triangle, opposite the right angle

32
Q

Hypotenuse

A

A²+B²=√C²

Make sure you square root C² to get the Hypotenuse

33
Q

Square inches of duct to square feet for formulas

A

Divide square inches by 144

If 20”x12=240, divide 240 by 144 240/144 which will give you the Area in ft², square footage of 1.66 ft² if the duct is 20”x12”

Austin's Sheet Metal 4th Year (7 decks)

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