Engineering Mechanics Competency Exam with correct solutions A+

• Engineering Mechanics Competency Exam
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The total weight of your elevator (force) is 8100 lbs. and its plunger area is 50 square inches.
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What is the system pressure? - CORRECT ANSWER✔✔162 psi
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Refer to the NEIEP Moving Walk Final Layout. What is the correct wellway-to-wellway
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distance? - CORRECT ANSWER✔✔134' 11"
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Electrolysis is caused by which of the following? - CORRECT ANSWER✔✔Stray currentn n n n n n n n n n n




corrosion and Galvanic corrosion BOTH ARE CORRECT
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When using wire rope, the diameter of the sheaves must be how many times the diameter of
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the suspension ropes? - CORRECT ANSWER✔✔30
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Wye-Delta starting is used for which of the following? - CORRECT ANSWER✔✔Reduced
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current starting
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You need the area of the plunger to calculate the pressure of the hydraulic system. Your
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plunger is 8 inches in diameter. What is it's area? - CORRECT ANSWER✔✔50.27 square
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inches
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Which of the following provides mechanical interlocking of contactors? - CORRECT
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ANSWER✔✔Interlock contacts
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As the certified welder on the job you must weld two cylinder pieces. How must you join the
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two pieces? - CORRECT ANSWER✔✔Tack welds then a fill bead
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Once a plunger joint has been completed, what steps should be followed to prevent damage
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to the packing? - CORRECT ANSWER✔✔Sand with emery cloth
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Under which of the following conditions will the buzzer (BZT) sound? - CORRECT
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ANSWER✔✔When the handrail speed is 15% below step speed.
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Refer to the NEIEP Escalator Final Layout diagram. What is the total distance from the first
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floor finished floor height and the second floor finished floor height? - CORRECT
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ANSWER✔✔13' 6"
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, Refer to the NEIEP Escalator Final Layout diagram. What is the correct measurement to
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align the truss in the center of the wellway? - CORRECT ANSWER✔✔7' 6 1/2"
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What is the function of the lower newel wheel on a moving walk with solid balustrades? -
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CORRECT ANSWER✔✔It acts as an idler
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Which of the following will determine the leveling speed of an elevator? - CORRECT
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ANSWER✔✔Rate of flow in gpm
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Which of the following best describes the rack and pinion drive motor brake? - CORRECT
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ANSWER✔✔It is spring set and electrically released
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Car door switches in LULA elevators are required to operate no more than how many inches
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from full closed? - - CORRECT ANSWER✔✔2"
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What is the maximum rated capacity of an inclined platform lift? - CORRECT
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ANSWER✔✔750 Ibs..
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Refer to the NEIEP Moving Walk Straight-Line Diagram. If both inspection switches (INSP
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sw.) are in the downward position, how will that affect the operation of the walkway? -
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CORRECT ANSWER✔✔The walkway would not run.
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Refer to Table 2. What is the capacity of a non-fixed 5X 3%" beam that spans 9 feet and
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weighs 14.75 Ibs. per linear foot? - CORRECT ANSWER✔✔2000 lbs
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Why is it important to only operate line starters with their covers in the proper location? -
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CORRECT ANSWER✔✔To prevent flashover between contacts
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What is the maximum speed in ft/min. of a residential elevator?. - CORRECT
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ANSWER✔✔40 ft/min.
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On a vertical platform lift the stop button must be located at what height above the platform
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floor? - CORRECT ANSWER✔✔between 48 and 15 inches
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Two line starters are required for what type of AC motor control? - CORRECT
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ANSWER✔✔Wye-Delta
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In order to perform a pressure relief test, which circuits would have to be temporarily
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bypassed? - CORRECT ANSWER✔✔The up limit switches
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What code do most issues regarding the installation of temporary hoists fall under? -
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CORRECT ANSWER✔✔ANSI A10.4
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