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Mechanical Engineering formulas

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Mechanical Engineering

Degree of Saturation

Mechanical Engineering

\[\mu = \frac{Specific_{humidity\_of\_air}}{Specific_{humidity\_of\_Saturated\_air}}\]
GATE
Open calculator Mechanical Engineering

Dew Point Depression

Mechanical Engineering

\[DPD = DBT - DPT\]
GATE
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Diametrical pitch for spur gear

Mechanical Engineering

\[P = \frac{z}{d}\]
GATE
Open calculator Mechanical Engineering

Diametrical Pitch in gear

Mechanical Engineering

\[P = \frac{T}{d}\]
GATE
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Direct shear stress in weld joints

Mechanical Engineering

\[\tau_{1} = \frac{Load}{Throat_{area}}\]
GATE
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Double parallel fillet weld

Mechanical Engineering

\[P = \frac{1.414 \cdot h}{\tau}\]
GATE
Open calculator Mechanical Engineering

Double transverse fillet joint

Mechanical Engineering

\[P = 1.414 \cdot h \cdot l \cdot \sigma_{t}\]
GATE
Open calculator Mechanical Engineering

Duration of Activity in PERT and CPM

Mechanical Engineering

\[LFT = LST + Duration_of_activity\]
GATE
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Economic order quantity with Instantaneous Replenishment

Mechanical Engineering

\[Q_{star} = \sqrt{\frac{2 \cdot D \cdot C_{o}}{C_{c}}}\]
GATE
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Effective radius in clutch

Mechanical Engineering

\[R_{m} = \frac{r_{1} + r_{2}}{2}\]
GATE
Open calculator Mechanical Engineering

Effectiveness of Heat Exchanger

Mechanical Engineering

\[\epsilon = \frac{Q_{actual} \cdot actual_{heat\_transfer}}{Q_{max} \cdot maximum_{possible\_heat\_transfer}}\]
GATE
Open calculator Mechanical Engineering

EFT in PERT and CPM

Mechanical Engineering

\[EFT = EST + Activity_Time\]
GATE
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Elongation of Circular Tapered Bar

Mechanical Engineering

\[\Delta = \frac{4 \cdot P \cdot L}{\pi \cdot D_{1} \cdot D_{2} \cdot E}\]
GATE
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Elongation of Prismatic Bar Due to External Load

Mechanical Engineering

\[\Delta = \frac{P \cdot L}{A \cdot E}\]
GATE
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Elongation of Prismatic Bar Due to Self-Weight

Mechanical Engineering

\[\Delta = \frac{P \cdot L}{2 \cdot A \cdot E}\]
GATE
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Emissivity of black surface

Mechanical Engineering

\[\epsilon = \frac{E}{E_{b}}\]
GATE
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Equation of Rectangular fin of infinite length

Mechanical Engineering

\[m = \sqrt{\frac{h \cdot p}{k \cdot A_{e}}}\]
GATE
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Equivalent Bending Moment

Mechanical Engineering

\[\tau = M + \sqrt{{M}^{2} + {T}^{2}}\]
GATE
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Euler’s Buckling Load

Mechanical Engineering

\[( P_ \cdot ( ( Critical ) ) ) = ( ( ( ( \pi ^ 2 ) \cdot EI ) ) / ( ( k \cdot ( l ^ 2 ) ) ) )\]
GATE
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Factor of Safety for brittle material

Mechanical Engineering

\[FOS = \frac{S_{w}}{\sigma}\]
GATE
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Factor of Safety for ductile material

Mechanical Engineering

\[FOS = \frac{S_{y}}{\sigma}\]
GATE
Open calculator Mechanical Engineering

Factor of Safety in Bolted Joints

Mechanical Engineering

\[FOS = \frac{Failure_{stress}}{Allowable_{stress}}\]
GATE
Open calculator Mechanical Engineering

Fin Effectiveness

Mechanical Engineering

\[\epsilon = \frac{Actual_{heat\_transfer\_from\_fin\_surface} \cdot Q}{Rate_{of\_heat\_transfer\_without\_fin}}\]
GATE
Open calculator Mechanical Engineering

Fin Efficiency

Mechanical Engineering

\[\eta = \frac{A_{ctual\_heat\_rate\_from\_fin} \cdot Q}{Maximum_{heat\_transfer\_rate} \cdot Q_{max}}\]
GATE
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