MECHANICS EXAM NEIEP (2025/2026) QUESTIONS WITH CORRECT DETAILED ANSWERS || ALREADY GRADED A+ NEWEST VERSION

What are the leads called on a silicon controlled rectifier? - ANSWER Anode, gate, cathode Once triggered, a silicon controlled rectifier stays on until - ANSWER current flow is interrupted When checking a SCR with an ohmmeter, what must be done to verify proper triggering operation? - ANSWER Connect the negative lead to the cathode and positive lead to the anode and connect a jumper wire from the gate to the anode and then remove the jumper. A silicone controlled rectifier is an example of a... - ANSWER Discrete electronic component What is normally done to remove ripple voltage from a full wave rectifier? - ANSWER Add capacitors and inductors after the rectifier diodes Zener diodes - ANSWER connected in reverse biased in a circuit Characteristic of a Shunt regulator? - ANSWER If current through the load increases, current through the zener decreases What is the Base 16 system commonly called? - ANSWER Hexadecimal What is the binary equivalent of 68? - ANSWER What is the hexadecimal equivalent of (2) - ANSWER 2F9 What inputs are necessary to get a low (0) on the output of the NAND - ANSWER A high (1) on inputs A and B What term describes the type of voltage arrangement associated with a driver circuit with an output to ground potential when active? - ANSWER Sink What is proper care and handling of printed circuit boards? - ANSWER Always remove power when installing or removing boards What type of elevator control passes up hall calls in the down direction and down hall calls in the up direction? - ANSWER Selective collective control What modification to the two-speed AC drive greatly improve floor accuracy? - ANSWER VVVF drives What type of diagram provides a picture of the appearance and location of elevator parts? - ANSWER Field wiring diagram What test instrument is best suited to monitor quickly changing voltages and current? - ANSWER Analog Meter When using the digital multimeter, what jack is the red lead plugged into for all measurements except current? - ANSWER Volt/Ohm Jack What is an advantage of a digital meter over an analog meter? - ANSWER Has automatic range selections What should be done first when reporting on the site of a trouble call? - ANSWER List the condition of the relays and associated contacts What diagram would you use to troubleshoot a controller problem? - ANSWER Straight-line wiring diagram What is the primary reason AC relay hum or chatter? - ANSWER AC cycle reversal How would you describe the contact rating of a magnetic switch? - ANSWER The maximum voltage and current that can be safely interrupted What kind of relay is commonly used for circuits on solid state equipment? - ANSWER Reed Relay How are latching relays reset? - ANSWER Electrically Testing with a multimeter, full line voltage is read directly across the door close relay coil. The coil, however will not pull in. What is likely the problem? - ANSWER Open Coil What would the data 120 NC 8 printed on the side of a bi-metallic timer represent? - ANSWER An 8 second timer with normally closed contacts and 120 volts When fully charged, what down capacitor voltage equal? - ANSWER 100% of the source voltage When a diode or resistor is connected in parallel across a coil, how is a short delay time achieved? - ANSWER The collapsing field What is a walking beam? - ANSWER A mechanical beam that prevents two opposite electrical functions from occurring simultaneously What is the typical labels for the load side of a 3-phase mainline disconnect switch? - ANSWER L1,L2,L3 An elevator equipment room that is equipped with fire sprinklers would require what type of circuit breaker? - ANSWER Shunt trip circuit breaker What instrument would you use to check a fuse with power removed from the circuit? - ANSWER Ohmmeter Which of the rectified power supplies is the most efficient? - ANSWER Three-phase, Full-Wave A Three-phase, full wave power supply uses how many rectifiers? - ANSWER 6 A single-phase, full-wave rectifier with 12-VAC input will produce how much DC voltage? - ANSWER 108VDC A blown AC fuse on a three-phase, full-wave rectifier will cause the DC voltage to ____ - ANSWER Decrease A regulated power supply that produces an almost pure DC is called a(n) ____ - ANSWER Exciter Most elevator manufacturers use which type of control system? - ANSWER Grounded When a hydraulic elevator is held at a floor, what prevents the piston from coming back down? - ANSWER Check Valve What type of drive uses SCRs to control the hoist motor? - ANSWER Static Drive The overload that consists of a coil, plunger, and a reservoir of silicon fluid is a ____. - ANSWER Dashpot overload If the car were running up in response to a 3rd floor call, when would the U relay de-energize? - ANSWER When the selector switch #3 opens What will be the condition of the latching or PL relays when the car is at the top floor? - ANSWER All set What is meant by self-holding a call relay? - ANSWER Holding a relay in with its own contact What method is used to cancel a registered call? - ANSWER Tapped relay coil with selector cancelling If a car speed were 100FPM, what should the stopping distance be? - ANSWER 24 inches When the car is closer than the proper slowdown distance, which circuit prevents an elevator from getting the stopping signal? - ANSWER Late call refusal A safety operated switch is considered a ____ - ANSWER Primary Safety Device