NOCTI - Motors, Motor Control Circuits and PLC's-Questions
What size copper feeder 90 degrees Celsius do you need for the following multiple motors 3 phase, 460 volt, 15HP-25HP-40HP?
#2
What size copper 75 degrees Celsius THHW wire do you need for the following multiple motors on 1 feeder 3 phase, 230 volt, 1 HP-5HP-10HP?
#6
What size copper 75 degrees Celsius THWN wire do you need for a 3 phase 208 volt 10 HP motor?
#8
What size copper 75 degrees Celsius XHHW wire do you need for a 3 phase 460 volt 25 HP motor?
#8
What size dual element fuse do you need for a 3 phase, 208 volt, 20 HP squirrel cage design B motor short circuit, ground fault protection?
100 amp
What size copper wire do you need for a 1 phase, 1 1/2 horsepower, 115 volt motor using 75 degrees Celsius XHHW insulation?
12
A continuous duty motor rated at more than 1 horsepower with a marked service factor 1.15 or greater, shall have an overload device rated at _________________.
125%
A single motor used in continuous duty shall have branch circuit conductors rated at not less than _____________________ motor full load current.
125%
Conductors supplying several motors shall have an ampacity of not less than ____________.
125% of largest motor full load amps plus all other motor full load amps
A thermal protector integral with the motor, that will prevent dangerous overheating, will be set at a trip value of ____________ for a motor full load current of 9 amps or less.
170%
The maximum rating or setting of a motor branch circuit, short circuit, and ground fault protective device for a single phase motor using time delay fuses.
175%
What size non time delay fuse do you need for a 40 amp wound rotor motor short circuit, ground fault protection.
60 amp
Conductors supplying a freight elevator with a duty cycle service of 15 minutes shall have an ampacity of ______________ motor full load current rating.
85%
Motors shall be located in an area so that _____________________.
adequate ventilation is provided lubrication of bearings can be accomplished replacing of brushes and belts can be accomplished
The power supply for a programmable logic computer must _________________.
charge internal batteries in case of power loss
In motor controls the letters - NO/NC are associated with ___________________.
contacts
A phase monitoring relay that shuts down a 3 phase motor if incoming power loses a phase is connected to ___________________.
control voltage
PLC's have push buttons, selector switches, joysticks, relay and starter contacts, pressure-flow-level-limit-photoelectric switches which are called ____________________.
discrete inputs
PLC's have lights, relays, solenoids, starters, alarms, valves, heating elements and motor which are called ___________________.
discrete outputs
A solenoid valve contains _______________.
electromagnet plunger with flow regulator valve
Which of the following is not a part of the four basic parts of a PLC?
machine section
Motor overload devices are intended to protect ___________________.
motors motor control apparatus motor branch circuit conductors
In motor controls, multiple start buttons are wired in __________________.
parallel
In motor controls, multiple stop buttons are wired in _________________.
series
