Elevator Mechanic Exam
Electrical Fundamentals & Control Systems Practice Questions
180 practice questions with detailed explanations — aligned to the Elevator Mechanic Exam.
Master Electrical Fundamentals & Control Systems to boost your score on the Elevator Mechanic Exam. Each question below mirrors the style and difficulty of real exam questions, complete with detailed explanations so you understand the why behind every answer. Work through all 180 questions, review any that trip you up, and use the related topics below to round out your preparation.
Q1.In an elevator control circuit, a safety circuit is wired in:
A.Parallel, so any open device stops the carB.Series, so any open device stops the carC.Series-parallel for redundancyD.Star topology to the controllerB. Series, so any open device stops the carExplanation: Elevator safety devices (door contacts, buffer switches, governor switch, pit stop switch, etc.) are wired in series. If any single safety device opens the circuit, the safety chain is broken and the elevator stops. This is a fundamental safety design principle — failure of any one device defaults to safe (stopped) state.
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Q2.What is the purpose of a contactor in an elevator drive system?
A.To regulate the voltage supply to the control circuitB.To open and close the main power circuit to the drive motor under loadC.To monitor car speed and activate the governorD.To level the car at a landingB. To open and close the main power circuit to the drive motor under loadExplanation: A contactor is an electromagnetic switching device that opens and closes the main power circuit to the elevator drive motor. It handles the high current required by the motor and is operated by a low-voltage control signal from the controller. Contactors are used for starting, stopping, and changing direction of the motor.
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Q3.A VF (Variable Frequency) drive controls elevator speed by:
A.Changing the voltage to the motor while keeping frequency constantB.Varying the frequency and voltage of AC power supplied to the motorC.Switching between multiple fixed-speed motor windingsD.Adjusting the field excitation in a DC motorB. Varying the frequency and voltage of AC power supplied to the motorExplanation: Variable Frequency Drives (VFDs, also called AC drives or inverters) control motor speed by adjusting both the frequency and voltage of the AC supply to the motor. Lower frequency = lower motor speed; higher frequency = higher motor speed. VFDs offer smooth acceleration and deceleration, high efficiency, and precise speed control — they have largely replaced DC drives in modern elevator installations.
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Q4.What is the function of a phase failure relay in an elevator?
A.To detect when a floor landing is not levelB.To protect the motor by stopping the elevator if one phase of three-phase power is lostC.To control the speed of the door operator motorD.To monitor current draw and detect motor overloadB. To protect the motor by stopping the elevator if one phase of three-phase power is lostExplanation: A phase failure (phase loss) relay monitors all three phases of the incoming three-phase power supply. If one phase is lost or significantly unbalanced, the relay opens the safety circuit and stops the elevator. Running a three-phase motor on two phases (single phasing) causes severe overheating and motor damage. The phase failure relay is a protective device, not a speed controller.
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Q5.In a microprocessor-based elevator controller, what is the primary function of the car operating panel (COP)?
A.To provide power to the door operatorB.To accept passenger floor call inputs and communicate them to the controllerC.To directly control the drive motorD.To measure the weight of passengers in the carB. To accept passenger floor call inputs and communicate them to the controllerExplanation: The Car Operating Panel (COP) contains the floor selection buttons, door open/close buttons, alarm, emergency stop, and intercom. In microprocessor systems, the COP communicates passenger inputs to the controller via serial communication (CAN bus, or proprietary protocols). The controller then processes these calls and dispatches the car.
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