elevator mechanics Actual Questions and Correct Answers
Q1
If rigging gear is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load. What is the beam
capacity?
Answer: 18,000lbs. Beam capacity is cut in half with use of clamp, when rigging all
blocks, rope, and clamps will be Equal to the lowest load rating
Q2
What are the consequences of misaligned joints on a Rack and Pinion?
Answer: Broken Gear teeth. CWT derailment. Excessive wear/ crease the surface of the
tube
Q3
There is a noise coming from a freight door. The sheave is moving, but the chain is not. What is
the problem?
Answer: Oil on the drive chain
Q4
What is the effect when you change a sling angle from 60 degrees to 30 degrees?
Answer: More tension, less capacity. Any angle 30 or less is dangerous
Q5
Generator runs at 600rpm and has 4 poles, what is the output frequency?
Answer: 20hz 600/60=10 10x2=20 RPM 60 x frequency / pole/2
Q6
How many wires are needed for the following circuit? Exclude spares.
BCE---SPI/BCD---SP2/BCD--- SP4/BCD---UR1/BCE---UR2/BCE---DR1/CRE--- DR2/GRD
Answer: 11 wires. You do not need the duplicates
, Q7
How must a 9 lead 480/240 motor be wired for High Voltage?
Answer: L1(1) L2(2) L3(3) Low Voltage L1(1-7) L2(2- 8) L3(3-9) 7-4 8-6 9-5 4 5 6 +
120v______0------ 0_______R2________A_________R1 GRD
Q8
There is voltage at the switch, but none at A, what is wrong?
Answer: Open at R2 or R1
Q9
The close door limit switch is not working, you have power at points 35-8, no voltage at 1-S2
why?
Answer: Door limit switch malfunction
Q10
The step level switch on an escalator has been tripped, where do you check?
Answer: Upper and Lower Truss assemblies, trips if step sags more than 1/8th inch
Q11
A motor needs a sleeve bearing replaced, what type of bearing do you need?
Answer: Friction bearing AKA Sleeve bearing. Anti-Friction Bearing AKA Ball bearing
Q12
What type of safeties are required on a 300fpm car?
Answer: Type B wedge clamp
Q13
What stopping devices are required on vertical platforms?
Answer: 2 pan switches. 15lbs max pressure
Q1
If rigging gear is roped 3:1 and a BEAM CLAMP is used to lift a 6,000lb load. What is the beam
capacity?
Answer: 18,000lbs. Beam capacity is cut in half with use of clamp, when rigging all
blocks, rope, and clamps will be Equal to the lowest load rating
Q2
What are the consequences of misaligned joints on a Rack and Pinion?
Answer: Broken Gear teeth. CWT derailment. Excessive wear/ crease the surface of the
tube
Q3
There is a noise coming from a freight door. The sheave is moving, but the chain is not. What is
the problem?
Answer: Oil on the drive chain
Q4
What is the effect when you change a sling angle from 60 degrees to 30 degrees?
Answer: More tension, less capacity. Any angle 30 or less is dangerous
Q5
Generator runs at 600rpm and has 4 poles, what is the output frequency?
Answer: 20hz 600/60=10 10x2=20 RPM 60 x frequency / pole/2
Q6
How many wires are needed for the following circuit? Exclude spares.
BCE---SPI/BCD---SP2/BCD--- SP4/BCD---UR1/BCE---UR2/BCE---DR1/CRE--- DR2/GRD
Answer: 11 wires. You do not need the duplicates
, Q7
How must a 9 lead 480/240 motor be wired for High Voltage?
Answer: L1(1) L2(2) L3(3) Low Voltage L1(1-7) L2(2- 8) L3(3-9) 7-4 8-6 9-5 4 5 6 +
120v______0------ 0_______R2________A_________R1 GRD
Q8
There is voltage at the switch, but none at A, what is wrong?
Answer: Open at R2 or R1
Q9
The close door limit switch is not working, you have power at points 35-8, no voltage at 1-S2
why?
Answer: Door limit switch malfunction
Q10
The step level switch on an escalator has been tripped, where do you check?
Answer: Upper and Lower Truss assemblies, trips if step sags more than 1/8th inch
Q11
A motor needs a sleeve bearing replaced, what type of bearing do you need?
Answer: Friction bearing AKA Sleeve bearing. Anti-Friction Bearing AKA Ball bearing
Q12
What type of safeties are required on a 300fpm car?
Answer: Type B wedge clamp
Q13
What stopping devices are required on vertical platforms?
Answer: 2 pan switches. 15lbs max pressure
