SACA C-202 ELECTRIC MOTOR CONTROL SYSTEMS PRACTICE EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS | ALREADY GRADED A+<RECENT VERSION>

SACA C-202 ELECTRIC MOTOR CONTROL SYSTEMS PRACTICE EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS | ALREADY GRADED A+&lt;RECENT VERSION&gt; 1) Grounding - ANSWER To provide a low-resistance path for fault current, ensuring safety and protecting equipment. 2) Common standards associated with electrical control - ANSWER NEMA, IEC, and NEC standards. 3) Ten basic rules of electrical safety - ANSWER Includes de-energizing circuits, using PPE, verifying lockout/tagout, testing before touch, and using insulated tools, among others. 4) Lockout/tagout system order - ANSWER Notify, shut down, isolate energy, apply LOTO device, release stored energy, and verify zero energy. 5) Three-phase power operation - ANSWER Three AC voltages 120° out of phase provide continuous power with higher efficiency. 6) Function of neutral in electrical power - ANSWER Serves as a return path for current in unbalanced systems and maintains voltage stability. 7) Grounded and ungrounded systems - ANSWER Grounded systems have one conductor connected to ground for safety; ungrounded systems do not, which can delay fault detection. 8) Overcurrent protection devices - ANSWER Fuses melt under excess current; breakers trip; overloads respond to sustained heat or current. 9) Three-phase motor operation - ANSWER Uses rotating magnetic fields from three-phase power to turn the rotor. 10) Interpreting motor's nameplate data - ANSWER Includes voltage, current, RPM, phase, service factor, and efficiency. 11) Connecting dual-voltage three-phase motor - ANSWER Use parallel connection for low voltage (e.g., 230V) and series for high voltage (e.g., 460V). 12) Never remove the grounding prong from an __________. - ANSWER AC plug 13) When blocking energy flow from a power source __________ that source is the safest choice. - ANSWER locking out 14) What conductor provides a common return path to the source for the conductors that carry current for the system? - ANSWER neutral 15) The output wave forms for a three-phase motor are __________. - ANSWER 120 out of phase 16) On an electrical device if __________ occurred, an electrical hazard can occur. - ANSWER the safety prong was removed from an AC cord 17) When taking a measurement with a digital multi-meter one must always __________. - ANSWER use one hand rule 18) An air compressor often uses a/an __________ sensor to control the system. - ANSWER pressure 19) Which switch is mostly used for operators to change from manual to automatic operations? - ANSWER selector switch 20) What value/term is used to determine the output of a transformer? - ANSWER turns ratio 21) Which of the following is NOT part of the Ladder Diagram Rules? - ANSWER Output devices are located on the left. 22) The purpose of a clutch in a motor control system is to __________. - ANSWER unload the motor and safety device 23) What is a manual method an operator can use to reverse direction of a 3 phase motor? - ANSWER Drum switch 24) If the primary coil had 450 coils with a 60 Hz signal at 90VAC and the secondary coil had 150 coils, what would be the secondary voltage? - ANSWER 30VAC 25) If you have two normally open push button switches connected in parallel what type of gate would that be? - ANSWER OR 26) In a magnetic motor's starter auxiliary control there is an extra set of normally open contacts provided that can be used as a__________. - ANSWER seal in circuit 27) Which parts of an electrical system are normally connected to equipment ground? - ANSWER Metal parts that do not normally carry current. 28) What purpose is there for having both electrical and mechanical interlocks in place for reverse motor control circuits? - ANSWER Keeping blocked coils from burning out if energized. 29) What are some safety considerations when working with electricity? - ANSWER All of the above 30) An electrical current as small as what can be fatal? - ANSWER 100 mA 31) Lockout/Tagout procedures are designed to: - ANSWER All of the above 32) In a 480VAC 3 phase wye system with a neutral ground, what are the phase to phase voltages and phase to neutral voltages? - ANSWER Phase-Phase = 480VAC, Phase-Neutral = 277VAC 33) An AC electric motor has two main parts: the ________ and the ____________. - ANSWER Rotor and Stator 34) What is motor synchronous speed? - ANSWER Speed at which the magnetic field is rotating 35) The maximum current that a conductor can carry continuously without exceeding its temperature rating is __________. - ANSWER Ampacity 36) Which of the following is a basic requirement for a typical motor installation? - ANSWER All of the above 37) Which of the following is a component of a magnetic motor starter? - ANSWER All of the above 38) Which of the following provides power to the motor in a magnetic motor starter? - ANSWER Contacts 39) Magnetic, manual, fractional, and integral are examples of: - ANSWER Motor Starters 40) Integral horsepower manual starters: - ANSWER Are generally designed to be used to start motors up to 10hp, three-phase 41) Which type of overload is tamperproof by design? - ANSWER Melting Alloy 42) How do you determine the proper set up of an adjustable overload? - ANSWER The current setting should be determined based on the FLA of the motor and its service factor 43) __________ protection on a manual starter will prevent the automatic restart of a motor when recovering from a power loss. - ANSWER Undervoltage 44) You are tasked with hooking up a multi-tap transformer to produce an output of 24 volts. The supply side is providing 120 volts. The secondary side of the transformer has windings with 400 turns. The primary has multiple tap options allowing you to choose primary turns of either 1,000, 1,200, 1,500, 2,000 turns. Which connections will provide you with the proper secondary voltage? - ANSWER 2,000 45) The series of moves a machine has to make in order to perform a task is called a(n) __________. - ANSWER sequence of operation 46) A logic machine's process may be broken down into three parts. They include outputs, inputs, and: - ANSWER logic or controller functions 47) _____ are used to represent the function of the control circuit and the associated devices. - ANSWER Ladder Diagrams 48) What logic circuit consists of two normally open switches wired in series? - ANSWER AND 49) You are required to wire something with a remote start button. What logic circuit would you choose? - ANSWER OR 50) What logic circuit is done by wiring 2 normally closed switches, wired in series? - ANSWER NOR 51) What logic circuit is wired in your automobile, where opening any door will turn on the lights, but you are required to close ALL the doors to shut them off? - ANSWER NAND 52) Which device is typically used to control one circuit with contacts in another circuit? - ANSWER Control Relay 53) The coil of a relay is a(n): - ANSWER Output Device 54) __________ is a method of representing one component with several symbols in various locations on a ladder diagram. - ANSWER Detached Symbology 55) The type of control relay used on heavy duty applications: - ANSWER Machine Control Relay 56) The main difference between a motor starter and a control relay is that the motor starter includes overload protection, such as an overload relay. - ANSWER True 57) How many overloads are needed for a 3-phase induction motor? - ANSWER 3 58) What logic circuit is wired into the circuit so that it continues to energize itself after a momentary input from a switch? - ANSWER Seal-in Circuit/Memory 59) A two-wire motor installation will allow automatic restarts of the motor after a power failure. - ANSWER True 60) When wiring a motor to a starter, what is the primary benefit of 3 wire motor control over two wire control or manual starters? Three wire control ___________________. - ANSWER prevents a motor from restarting when power is applied following a power failure 61) What device has a third terminal directly connected to power, that when pressed supplies power to it to light it up? - ANSWER Push-to-Test Indicator light 62) In order to reverse the direction of a 3-phase motor, you should: - ANSWER Swap T1 and T3 63) What is not a common control method used to reverse a three-phase motor? - ANSWER Reversing relay position 64) A drum switch provides an automatic method of changing the direction of motor rotation. - ANSWER False 65) Interlock contact is used with reversing motor contactors to ensure both forward and reversed contactors energize at the same time. - ANSWER False 66) The _______________ method of interlocking uses a lever to physically prevent the armature of one of the contacts from moving. - ANSWER Mechanical 67) The ______________ method of interlocking uses two Double Pole, Single Throw (DPST) push buttons. - ANSWER Automatic Interlocking 68) What is the process of operating one of the machines actuators in the manual mode called? - ANSWER Jogging 69) Using timers to sequence the operation of a machine is called __________. - ANSWER Time-Driven Sequencing 70) Which of the following is not a common timing mechanism used on timer relays? - ANSWER Hydraulic 71) A transformer uses the principle_____________ - ANSWER mutual inductance 72) which of the following is not a component of a transformer? - ANSWER electrical coupling 73) The relationship b/w the input voltage and output of a transformer is based on the - ANSWER turns rotation 74) The output voltage of a transformer can be determined if you know the input voltage and the turns ratio - ANSWER true