Elevator mechanics exam 300

What's the equation for the volume of the cylinder? - Correct answer-V (volume)= pi multiplied by R squared multiplied by the height Example: radius is 6" height is 30 V=3.1416•6•6•30 A drill draws a current (I) of 4.5 amps and resistance of 16.0 ohms, how do You find the power(watts)? - Correct answer-P=I squared (amps) multipled by R(resistance) Example:P=4.5•4.5•16.0 4.5•4.5=20.25 20.25•16.0=324 P=324 What is the equation for distance? - Correct answer-D=R•T D(distance=R(rate) multiplied by T(time) What is the equation for pressure? - Correct answer-pressure = force/area P(pressure)= F(force) divided by A(area) What is the equation For voltage? - Correct answer-E=I•R voltage (E) = current(I) x resistance(R) What is the equation for current or amps (i)? - Correct answer-I=E/R i (current in Amps) R=(resistance in ohms) E(volts) What is the equation for series voltage? - Correct answer-Et=E1=E2=E3 ET(total voltage) What is the equation for series resistance? - Correct answer-Rt=R1+R2+R3 R=resistance What is the equation for series current? - Correct answer-It=i1=i2=i3 it=total current in amps I=current in amps How do you calculate resistance of a wire? - Correct answer-R=P•L/A R=resistance of the wire P= resistivity constant of the wire L=length of the wire A=cross sectional area of the wireWhat is the equation for parallel voltage? - Correct answer-Et=E1=E2=E3 E=voltage ET=total voltage What is the equation for parallel current? - Correct answer-iT=i1+i2+i3 I=current in amps iT=total current in amps What is the equation for parallel resistance? - Correct answer-RT= 1 divided by 1/R1 + 1/R2 +1/R3 Add each fraction (1/R1-1/R3) Divide the answer of each resistance by 1 **** What is the equation for pulley relationship? - Correct answer-(Diameter of First pulley) •(RPM of first pulley) (diameter of second pulley) •(RPM of second pulley) Take RPM of the first pulley and multiply it by the diameter of the first pulley, then divide that by the diameter of the second pulley. What is the equation for sprocket relationship ? - Correct answer-(Number of teeth in sprocket1)•(RPM of sprocket 1)= (number of teeth in sprocket 2)•(RPM of sprocket 2) Take the number of teeth and multiply it by the RPM, then divide it by the number of teeth in sprocket 2 What is the equation for leverage(lever principle)? - Correct answer-F1D1=F2D2 F1=weight to be lifted