SACA C-202 Electric Motor Control Systems
Questions and Answers | Study Guide |
Grade A+
• A current as small as _____ can be fatal. CORRECT ANSWER: 100 mA
• _____ stands for National Electrical Code. CORRECT ANSWER: NEC
• Standing on a wet floor _____ the resistance between you and ground, increasing the
possibility of severe shock. CORRECT ANSWER: Decreases
• _____ is the process of blocking the energy flow from a power source to a piece of
equipment and assuring it remains blocked. CORRECT ANSWER: Lockout
• An alternator has three main windings that are placed _______ degrees apart.
CORRECT ANSWER: 120
• A ___ configured distribution system has one end of each phase winding connected
together. CORRECT ANSWER: WYE
• A(n) _____ configured distribution system has each phase winding connected end-to-
end to form a loop. CORRECT ANSWER: DELTA
• A(n) _____ is a conductor that provides a return path to the source for the current
carrying conductors in the system. CORRECT ANSWER: Neutral
• When one of the phases of a system becomes grounded, it is called a _____.
CORRECT ANSWER: Ground Fault
• The two most common devices to disconnect power to a circuit are a _____ and a
circuit breaker. CORRECT ANSWER: Fusible Disconnect
• A _____ fuse has two elements, an instantaneous element and an overload element.
CORRECT ANSWER: Time-Delay
• _____ current is the current that is drawn by a motor when it is operating at its rated
operating speed. CORRECT ANSWER: Full-Load
• _____ is the maximum current carrying capacity of a conductor. CORRECT
ANSWER: Ampacity
• Typically, the overcurrent protection for a motor should be selected for _________ %
of the full-load current of the motor. CORRECT ANSWER: 125
, • The _____ of a three-phase motor is made up of three separate sets of windings.
CORRECT ANSWER: Stator
• One of the most common NEMA frame sizes for small motors is _____. CORRECT
ANSWER: 56
• _____ is the temperature of the air surrounding an operating motor. CORRECT
ANSWER: Ambient Temperature
• The _____ represents the margin of safety for operating a motor above its rated output
power. CORRECT ANSWER: Service Factor
• A disconnect must open all ungrounded conductors ____________ CORRECT
ANSWER: Simultaneously
• Overload protection is designed to protect the _____ by disconnecting it from the
power source when an overload is sensed. CORRECT ANSWER: Motor
• A _____ is a motor controller that includes overload protection. CORRECT ANSWER:
Motor Starter
• The contacts of a(n) _________________ motor starter are opened and closed when
acted upon by a coil. CORRECT ANSWER: Magnetic
• Fractional horsepower starters are used only for _____ motors rated for less than 1hp.
CORRECT ANSWER: Single-Phase
• Three-pole integral horsepower starters are sued to control _____ motors rated up to
10hp. CORRECT ANSWER: Three-phase
• The contacts of a manual motor starter will remain actuated if power is lost unless the
starter has _____ protection CORRECT ANSWER: Low-Voltage
• An _____ is used to sense when a motor is being operated beyond its safe operating
limits. CORRECT ANSWER: Overload device
• The two types of thermal overloads are melting alloy and _____. CORRECT
ANSWER: Bimetallic
• When an overload is detected by a bimetallic overload, the two metals _____ and
cause the starter contacts to open. CORRECT ANSWER: Deflect
• In a 480VAC 3 phase WYE system with a neutral ground, what are the phase to phase
voltages and the phase to neutral voltage? CORRECT ANSWER: Phase-Phase =
480VAC / Phase-Neutral = 277VAC
Questions and Answers | Study Guide |
Grade A+
• A current as small as _____ can be fatal. CORRECT ANSWER: 100 mA
• _____ stands for National Electrical Code. CORRECT ANSWER: NEC
• Standing on a wet floor _____ the resistance between you and ground, increasing the
possibility of severe shock. CORRECT ANSWER: Decreases
• _____ is the process of blocking the energy flow from a power source to a piece of
equipment and assuring it remains blocked. CORRECT ANSWER: Lockout
• An alternator has three main windings that are placed _______ degrees apart.
CORRECT ANSWER: 120
• A ___ configured distribution system has one end of each phase winding connected
together. CORRECT ANSWER: WYE
• A(n) _____ configured distribution system has each phase winding connected end-to-
end to form a loop. CORRECT ANSWER: DELTA
• A(n) _____ is a conductor that provides a return path to the source for the current
carrying conductors in the system. CORRECT ANSWER: Neutral
• When one of the phases of a system becomes grounded, it is called a _____.
CORRECT ANSWER: Ground Fault
• The two most common devices to disconnect power to a circuit are a _____ and a
circuit breaker. CORRECT ANSWER: Fusible Disconnect
• A _____ fuse has two elements, an instantaneous element and an overload element.
CORRECT ANSWER: Time-Delay
• _____ current is the current that is drawn by a motor when it is operating at its rated
operating speed. CORRECT ANSWER: Full-Load
• _____ is the maximum current carrying capacity of a conductor. CORRECT
ANSWER: Ampacity
• Typically, the overcurrent protection for a motor should be selected for _________ %
of the full-load current of the motor. CORRECT ANSWER: 125
, • The _____ of a three-phase motor is made up of three separate sets of windings.
CORRECT ANSWER: Stator
• One of the most common NEMA frame sizes for small motors is _____. CORRECT
ANSWER: 56
• _____ is the temperature of the air surrounding an operating motor. CORRECT
ANSWER: Ambient Temperature
• The _____ represents the margin of safety for operating a motor above its rated output
power. CORRECT ANSWER: Service Factor
• A disconnect must open all ungrounded conductors ____________ CORRECT
ANSWER: Simultaneously
• Overload protection is designed to protect the _____ by disconnecting it from the
power source when an overload is sensed. CORRECT ANSWER: Motor
• A _____ is a motor controller that includes overload protection. CORRECT ANSWER:
Motor Starter
• The contacts of a(n) _________________ motor starter are opened and closed when
acted upon by a coil. CORRECT ANSWER: Magnetic
• Fractional horsepower starters are used only for _____ motors rated for less than 1hp.
CORRECT ANSWER: Single-Phase
• Three-pole integral horsepower starters are sued to control _____ motors rated up to
10hp. CORRECT ANSWER: Three-phase
• The contacts of a manual motor starter will remain actuated if power is lost unless the
starter has _____ protection CORRECT ANSWER: Low-Voltage
• An _____ is used to sense when a motor is being operated beyond its safe operating
limits. CORRECT ANSWER: Overload device
• The two types of thermal overloads are melting alloy and _____. CORRECT
ANSWER: Bimetallic
• When an overload is detected by a bimetallic overload, the two metals _____ and
cause the starter contacts to open. CORRECT ANSWER: Deflect
• In a 480VAC 3 phase WYE system with a neutral ground, what are the phase to phase
voltages and the phase to neutral voltage? CORRECT ANSWER: Phase-Phase =
480VAC / Phase-Neutral = 277VAC
