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