Michelin ECT Full Course Practice Exam

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• Which motor type is described as Open Drip Proof?
• Which item is typically listed on a motor nameplate?
• Impedance Z is the vector sum of which two quantities?
• Where is ambient-compensated circuit breaker typically used?
• Real Power (P) in a circuit is calculated as V × I × cos(phi) and is measured in Watts. Which of the following expressions represents Real Power?
• What does S stand for in power calculations?
• What is Ohm's Law?
• Start buttons are which color?
• In a wound rotor motor, what is the function of brushes?
• In a transformer, the coil which receives energy from the AC source is called the
• This core of a contactor or relay is made of laminated steel in order to ___________________________
• What should you do when asked to state or draw all impedance triangles?
• What is a common problem with shielded capacitive proximity sensors?
• Which of the following does NOT determine magnetic field strength?
• When would you want to use a shielded capacitive sensor as opposed to an unshielded variant?
• In distribution protection, selective coordination means only the protective device nearest the fault opens. Which term describes this behavior?
• How do you reverse a three-phase motor?
• What are the three types of Photocell configurations?
• In a circuit with capacitors connected in series, how does the total capacitance compare to the individual capacitors?
• What is the formula for X_L (inductive reactance)?
• Who has the best beard in the class?
• What do ORANGE or YELLOW wires signify?
• What is solenoid action?
• Which statement about diode forward voltage drops is correct?
• Which of the following is NOT listed as a use of the Control Relay?
• Which expression represents the instantaneous voltage according to the sinusoidal formula?
• Which description best describes an E-stop button in safety systems?
• In a circuit with capacitors connected in parallel, the total capacitance does what?
• Reactive power is measured in which units?
• Which statement defines the continuous current rating?
• Open Drip Proof (ODP) motor design permits air exchange around windings within which angle range downward from the vertical?
• Which statement best describes orange or yellow wires?
• Among short circuit current and overload current, which is typically greater?
• Which statement defines the Voltage Rating of a fuse?
• The overload relay is used to protect motors in case of prolonged overload at what percentage of full-load current?
• Which sensor type is commonly used to sense through a tank wall for non-metallic contents?
• Stop buttons are which color?
• What are the minimum conductor sizes for power and control circuits?
• A _________is always used in the control circuit.
• For AC motor codes, the higher the motor code indicates
• What does the 'Duty' block mean on a motor nameplate?
• In AC motor efficiency, Pout represents what?
• What do GREEN wires with or without YELLOW stripes signify?
• Inductive Reactance Xl is the opposition to the flow of alternating current caused by the inductance of a circuit, measured in ohms. Which option correctly defines Xl?
• Which statement best describes the Interrupting Rating?
• Which photocell configuration uses a separate reflector to bounce light back to the receiver?
• What is the correct expression for actual shaft speed Nr when considering slip?
• Which statement best describes Ohm's Law?
• What do rectifier circuits do?
• For a 445T motor, what is the shaft height?
• Which of the following is a likely symptom when shielded capacitive sensors operate in dirty or damp conditions?
• What is resistance?
• In IEC contactor life expectations, which two counts are commonly specified?
• Which component is used to detect the light source in a photocell?
• In periodic wave terminology, what does T represent?
• What is the DC power formula?
• In the three-phase power equations, which statement correctly describes the use of the angle φ for real and reactive power?
• What are the two modes of operation for ultrasonic sensors?
• Capacitive proximity sensors are capable of detecting which surfaces?
• How is slip expressed as a percentage?
• What are the two requirements for a circuit?
• Impedance Z is the total opposition to current flow in an AC circuit. It is the vector sum of resistance and reactance. Which statement best completes this definition?
• In a Wye (Y) configuration, how are line voltage and phase voltage related, and how are line current and phase current related?
• The impedance triangle is used to visualize which quantities together?
• In the coils of a transformer, current I is ______ proportional to the voltage V on the coils.
• What is Overcurrent?
• Three-phase circuits can be used for single-phase loads. True or false?
• Apparent Power (S) equals V × I and is measured in VA. Which option represents Apparent Power?
• How overloads and shorts manifest in single-element and dual-element fuses?
• What are the positive and negative terminals of a diode called?
• Which statement best describes how IEC contactor life expectations are specified?
• Who is most likely to be forcibly removed from campus?
• Which statement best defines overload current?
• For the mechanical operations lifetime of an IEC contactor, what is commonly expected?
• How does rotor speed interact with the magnetic field in an induction motor?
• What are the forward voltage drops for Germanium and Silicon diodes, and which type is more commonly used?
• Push buttons are considered light or heavy duty based on...
• White wires with blue stripes indicate which type of conductor?
• Which statement best defines short circuit current?
• What is the third listed advantage of AC motors over DC motors?
• How many watts are in one horsepower?
• Reactive Power (Q) is given by V × I × sin(phi) and is measured in VARS. Which option represents Reactive Power?
• What is shaft horsepower?
• Which formula expresses frequency in terms of the time period T?
• In a Delta (Δ) configuration, how are line current and phase current related, and how are line voltage and phase voltage related?
• What is the purpose of the stator in both classes of AC motors?
• What are the two main classes of INDUCTION motors?
• Who is best swearing?
• Which are uses of the Control Relay?
• How is the shaft centerline height from the bottom of the feet determined from the frame size?
• In AC motors, what is slip?
• What is the correct unit for inductance?
• Who are CSA and UL?
• In a balanced three-phase system, which expressions correctly give real, reactive, and apparent power?
• According to NEMA, what is motor 'design'?
• Which standards govern electrical diagram symbols?
• Which statement best describes orange or yellow wires?
• What is the stated purpose of the stator in AC motors?
• What type of surfaces are INDUCTIVE prox sensors able to detect?
• What type of button will E-stops be?
• Which statement correctly lists the available photocell configurations?
• In ambient-compensated circuit breaker, which element responds to current?
• Which statement correctly defines the Continuous Current Rating?
• Besides increasing the frequency, which would increase the inductive reactance X_L?
• When detecting fluid levels through a tank, which type of proximity sensor would be used?
• On an AC motor nameplate, rated load current in amps is at
• What does the third digit in a motor frame size specify?
• In the formula Ns = 60f ÷ P, what does P represent in the synchronous speed calculation?
• Which item is listed as the first advantage of AC motors over DC motors?
• Which sensing category uses a dark-operate output when no target is present?
• What is interrupting capacity?
• Which of the following is a heavy-duty AC push-button rating?
• Which statement is an advantage of circuit breakers over fuses?
• What determines the strength of a magnetic field?
• Which proximity sensor type is commonly used to detect fluid levels through a tank?
• Which of the following is a unit of inductive reactance?
• An overload current is typically one to six times the normal current. Which option correctly states this range?
• What do thermal cutouts in dual-element fuses allow for?
• State Lenz's Law.
• What is the fourth listed advantage of AC motors over DC motors?
• What is the second listed advantage of AC motors over DC motors?
• Overload current is typically how many times the normal current?
• In an ambient-compensated circuit breaker, what happens when ambient temperature increases?
• Percent slip at no-load is less than 1% while at full-load is usually between 3% and 5%. What does this indicate about the motor?
• Which device opposes a change in current?
• In a wound rotor motor, which component provides the external connection to rotor windings?
• Inductance L is defined as the coil's ability to oppose a change in current flow and is measured in henries. Which option describes inductance most accurately?
• A _________________ belongs to both the control circuit and the power circuit.
• Which of the following is a heavy-duty DC push-button rating?
• A photocell is in which mode when its output is ON only if light from the source is detected?
• What is the inherent problem with ultrasonic proximity sensors?
• To detect targets with low dielectric constant, which proximity sensor variant is typically chosen?
• What is an Open Drip Proof (ODP) motor?
• What is the purpose of a fuse?
• Which of the following is the correct expression for slip (S) in terms of synchronous speed Ns and rotor speed Nr?
• Which statement correctly identifies the problematic behavior of shielded capacitive proximity sensors in certain environments?
• What are the two classes of AC motors?
• Start buttons are what color and type?
• Henry is the unit of inductance. Which option correctly identifies the unit for inductance?
• What is the term for the difference between the on and off points of proximity sensors?
• Who is most likely to be a feet guy?
• What are the two types of prox sensors?
• What do WHITE wires signify?
• Stop buttons are what color and type?
• Voltage Rating of a Fuse is defined as:
• Formula for the speed of the magnetic field in an induction motor is Ns = (60 × f) ÷ P. What does P represent?
• If inductive reactance X_L is calculated by X_L = 2 pi f L, what happens to X_L when frequency doubles?
• To reliably detect materials with very low dielectric constant, which sensor variant is appropriate?
• The function of the circuit breaker corresponds basically to that of
• What is the formula to find Imax from Irms?
• Interrupting Rating refers to which characteristic?
• Which equation correctly defines AC motor efficiency?
• Which part supports the shaft and houses the bearings in a motor?
• What is a Totally Enclosed Fan-Cooled (TEFC) motor?
• In protective coordination, which statement describes the desired outcome?
• What types of surfaces are CAPACITIVE prox sensors able to detect?
• Which formula defines the root-mean-square (Vrms) value in terms of Vmax?
• Is a motor rated for 460V safe to use on a 480V circuit?
• A thermal-magnetic circuit breaker is characterized by which arrangement?
• How many advantages are listed for AC motors over DC motors?
• Which component is the rotating member of a squirrel cage motor that provides the torque to do the mechanical work?
• What is the generally accepted lifetime expectation for an IEC contactor's electrical operations?
• Which aspects of an AC motor are determined by its frame size?
• In a TEFC motor, what best describes the enclosure's interaction with outside air?
• Which statement correctly identifies the most common lifecycle count for IEC contactors?
• The coil that delivers energy to the AC load is called the
• Which of the following is a standard duty AC push-button rating?
• Which of the following is an advantage of a three-phase system compared with a single-phase system?
• What is used to stop chattering in coils?
• Which statement best describes AC voltage?
• What is the formula for the average voltage Vav as stated?
• What do WHITE wires with BLUE STRIPES signify?
• Which proximity sensor variant is best suited for detecting materials with low dielectric constant?
• In motor control, which device is used to switch power to the motor and is energized by the control circuit?
• What is the purpose of a transformer?
• How do fuses operate?
• Which device is typically used to provide isolation between the control signal and the high-power motor circuit?
• Which color wires signify equipment grounding conductors?
• Which statement describes the difference between thermal and magnetic circuit breakers?
• If a coil is good it should read approximately ______ ohms for a 120v coil, and approximately _______ ohms for a 24v coil.
• Which statement about conductor sizing is accurate?
• Impedance is measured in which unit?
• Which photocell configuration detects the target by receiving light reflected from the target back into the sensor?
• Which organization is known for establishing safety standards in North America for electrical equipment?
• What is the formula for efficiency in a transformer?
• Which component is the stationary winding that provides the rotating magnetic field in a squirrel cage motor?
• Who is best behaved?
• A magnetic circuit breaker trips when?
• Which statement distinguishes Open Drip Proof (ODP) from Totally Enclosed Fan-Cooled (TEFC) motors?
• Which statement about current-limiting fuses is NOT true?
• Power Factor (PF) is defined as cos(phi). Which option correctly states PF?
• What are the two basic types of current-limiting fuses?
• Where will all pushbuttons be installed relative to their associated stop buttons?
• What is used to provide an interface with machine logic in a photo cell?
• In a delta configuration, line current equals what multiple of phase current?