Exam (elaborations)
Mechanics Exam NEIEP Latest Updates 2024/2025
- Course
- Mechanics
- Institution
- Liberty University
Mechanics Exam NEIEP Latest Updates 2024/2025
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Mechanics Exam NEIEP LatestUpdates 2024/2025
1" is equal to ______ cm ANS✔✔ 2.54 cm
1" is equal to ______mm ANS✔✔ 25.4 mm
Circumference Formula ANS✔✔ C = 2πr
Area of a circle ANS✔✔ A=πr²
Pressure formula ANS✔✔ Pressure = Force/Area or P = F/A
RPM formula ANS✔✔ 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 ANS✔✔ 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 ANS✔✔ T=L/R Where T
is time in seconds, L is inductance in henries and R is reaistance
,formula for frequency ANS✔✔ f=1/T where T is time(period) in seconds
Effective Value (RMS) formula if given peak ANS✔✔ 0.707 x peak value
Average Value Formula if given peak ANS✔✔ .636 x peak
Peak value if given average ANS✔✔ Peak= AVG/0.636 OR
Peak= AVG x 1.57
peak to peak value ANS✔✔ 2x peak value
Peak value when given effective or RMS ANS✔✔ Peak= 1.414 x Effective or
RMS
Peak to peak value when given RMS or effective ANS✔✔ Peak to Peak=
2.828x RMS
Formula for unequal resistances in a parallel circuit ANS✔✔ R= 1/
1/r1+ 1/r2.........
Formula for resistance in series parallel circuit ANS✔✔ Add the resistor in
series to the total resistance of resistors in parallel
LULA Max Rise ANS✔✔ 25 ft.
LULA Max Speed ANS✔✔ 30 ft. Min
, LULA Max Capacity ANS✔✔ 1400 Lbs.
LULA Max Platform Area ANS✔✔ 18 sq ft
Residential Elevator Max Rise ANS✔✔ 50 ft.
Residential Elevator Max Speed ANS✔✔ 40 ft. Min
Residential Elevator max capacity ANS✔✔ 940 lbs.
Residential Elevator Max Platform Area ANS✔✔ 15 sq. Feet
Lula Permanent Mechanical holding device Measurement ANS✔✔ 35"-79"
above pit floors. 24" minimum above bottom sill
Residential elevator pit enclosure height ANS✔✔ 84"
Lula traction rope size and aircraft cable size ANS✔✔ 30x diameter for
traction
21x diameter for aircraft cable
Hydraulic LULA Overspeed valve Tripping speed ANS✔✔ 110%-140%
Roped Hydro LULA is required to have safeties and a governor also
Residential Elevator Governor Trip Speed ANS✔✔ No more than 75 ft min
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