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NEIEP Mechanics Exam: Formulas and Examples, Exams of Mechanics

West Virginia Wesleyan CollegeMechanics

A comprehensive list of formulas and examples related to mechanics, covering topics such as circumference, area, pressure, rpm, time constant, frequency, effective value, peak value, resistance in series and parallel circuits, elevator specifications, dumbwaiter specifications, rectifier output equations, transformer ratios, and pit ladder regulations. It is a valuable resource for students studying mechanics and provides practical examples to illustrate the application of the formulas.

Typology: Exams

2024/2025

Available from 12/30/2024

jack-kangethe
jack-kangethe 🇺🇸

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NEIEP Mechanics Exam
1" is equal to ______ cm - 2.54 cm
1" is equal to ______mm - 25.4 mm
Circumference Formula - C = 2πr
Area of a circle - A=πr²
Pressure formula - Pressure = Force/Area or P = F/A
RPM formula - 60 x F /( N/2) where F(frequency is Hz) N is the number of poles
Example: what is the rotating speed of a three phase 30 HZ 6 pole motor?
60 x 30hz = 1800 1800 •/• 3 poles = 600RPM
Time constant formula in resistive capacitive circuit - T = RC where T is time in sec. R is Resistance and C
is Capacitance which is probably is in microfarads
Time constant formula in a resistive inductive circuit - T=L/R Where T is time in seconds, L is inductance
in henries and R is reaistance
formula for frequency - f=1/T where T is time(period) in seconds
Effective Value (RMS) formula if given peak - 0.707 x peak value
Average Value Formula if given peak - .636 x peak
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NEIEP Mechanics Exam

1" is equal to ______ cm - 2.54 cm 1" is equal to ______mm - 25.4 mm Circumference Formula - C = 2πr Area of a circle - A=πr² Pressure formula - Pressure = Force/Area or P = F/A RPM formula - 60 x F /( N/2) where F(frequency is Hz) N is the number of poles Example: what is the rotating speed of a three phase 30 HZ 6 pole motor? 60 x 30hz = 1800 1800 •/• 3 poles = 600RPM Time constant formula in resistive capacitive circuit - T = RC where T is time in sec. R is Resistance and C is Capacitance which is probably is in microfarads Time constant formula in a resistive inductive circuit - T=L/R Where T is time in seconds, L is inductance in henries and R is reaistance formula for frequency - f=1/T where T is time(period) in seconds Effective Value (RMS) formula if given peak - 0.707 x peak value Average Value Formula if given peak - .636 x peak

Peak value if given average - Peak= AVG/0.636 OR Peak= AVG x 1. peak to peak value - 2x peak value Peak value when given effective or RMS - Peak= 1.414 x Effective or RMS Peak to peak value when given RMS or effective - Peak to Peak= 2.828x RMS Formula for unequal resistances in a parallel circuit - R= 1/ 1/r1+ 1/r2......... Formula for resistance in series parallel circuit - Add the resistor in series to the total resistance of resistors in parallel LULA Max Rise - 25 ft. LULA Max Speed - 30 ft. Min LULA Max Capacity - 1400 Lbs. LULA Max Platform Area - 18 sq ft Residential Elevator Max Rise - 50 ft. Residential Elevator Max Speed - 40 ft. Min Residential Elevator max capacity - 940 lbs.

Max clearance between dumbwaiter cab and hoistway enclosure - No less than 1/2" Single phase full wave rectifier output equation - .9x input voltage 3 phase full wave rectifier output voltage equation - 1.33x the input voltage Frequency (Hz) formula - Frequency= RPMx N(number of poles/ 120) RPM to FPM conversion - (Diameter (in inches) x PIE/12) x RPM = Ft/Min Equation to find inductive reactance - 2piefL Transformer ratio - Ep/Es=Np/Ns Transformer Efficiency Equation - Ep/Es=Is/Ip Pit Ladder Regulations - If pit extends more than 35" a pit ladder must be present. Ladder must extend 48" above sill Ladder rungs must be at least 16" wide Pit stop switch deep pit - Greater than 67" (deep pit) you need a second stop switch 47" above pit floor Sill guard and toe guard measurements - Leveling zone plus 3" Low voltage motor connection 9 lead - L1 T1-T7, L2 T2-T8, L3 T3-T T4,T5,T6 wire nutted together High voltage motor wiring 9 lead - L1-T1, L2-T2, L3-T

T7-T4, T8-T5, T9-T

Minimum six for escape hatch - 40 square inches Max gap leading edges of center opening doors - 1/2" Overlap minimum for horizontal sliding doors - 5/8" Vertical distance from door panel to sill - 3/8" Formula for 2 unequal resistances in parallel - R1xr2/r1+r