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NEIEP Mechanics Exam latest update
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1" is equal to ______ cm - ANSWER - 2.54 cm 1" is equal to ______mm - ANSWER - 25.4 mm Circumference Formula - ANSWER - C = 2πr Area of a circle - ANSWER - A=πr² Pressure formula - ANSWER - Pressure = Force/Area or P = F/A RPM formula - ANSWER - 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 - ANSWER - 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 - ANSWER - T=L/R Where T is time in seconds, L is inductance in henries and R is reaistance formula for frequency - ANSWER - f=1/T where T is time(period) in seconds Effective Value (RMS) formula if given peak - ANSWER - 0.707 x peak value
Formula for resistance in series parallel circuit - ANSWER
Residential Elevator Max Platform Area - ANSWER - 15 sq. Feet Lula Permanent Mechanical holding device Measurement
Dumbwaiter Max cab height - ANSWER - 4' Max door height Dumbwaiter - ANSWER - 54" Max clearance between dumbwaiter cab and hoistway enclosure - ANSWER - No less than 1/2" Single phase full wave rectifier output equation - ANSWER - .9x input voltage 3 phase full wave rectifier output voltage equation - ANSWER - 1.33x the input voltage Frequency (Hz) formula - ANSWER - Frequency= RPMx N(number of poles/ 120) RPM to FPM conversion - ANSWER - (Diameter (in inches) x PIE/12) x RPM = Ft/Min
Equation to find inductive reactance - ANSWER - 2piefL Transformer ratio - ANSWER - Ep/Es=Np/Ns Transformer Efficiency Equation - ANSWER - Ep/Es=Is/Ip Pit Ladder Regulations - ANSWER - 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 - ANSWER - Greater than 67" (deep pit) you need a second stop switch 47" above pit floor Sill guard and toe guard measurements - ANSWER - Leveling zone plus 3"
Formula for 2 unequal resistances in parallel - ANSWER - R1xr2/r1+r
