Motor Control Exam Questions and
Answers
A _____________ horsepower motor starter resembles a toggle switch with an overload
element. - correct answer-fractional
Line voltage rated sensing devices or pilot devices such as temperature, float or limit
switches should have contacts rated for 15 to _____amperes since they would have to
carry the same load as the manual starter. - correct answer-20
Single phase manual starters that are integral, not fractional, horsepower are intended
to control single phase motors up to ___ horsepower. - correct answer-5
Three phase manual starters are intended to control three phase motors up to ___
horsepower. - correct answer-10
The correct operation of a 3 phase overload relay on a manual starter is such that if any
one of the overloads should trip, a mechanical mechanism opens the load
_______________ and disconnects the motor from the line. - correct answer-contacts
Motor starting current is referred to as ____________________ current. - correct
answer-locked rotor current
Fuses which are intended to provide both short circuit protection and overload
protection are called ____________________ time delay fuses. - correct answer-dual-
element
All solenoids or coils that operate on alternating current must have a(n)
____________________ coil to maintain enough magnetism when the AC sine wave
crosses zero . - correct answer-shading
Contactors are equipped with contacts intended to connect high current loads to the
power line; these large contacts are called ____________________ contacts. - correct
answer-load or power
Mechanically held contactors and relays are often referred to as
____________________ contactors or relays. - correct answer-latching
Integral horsepower manual starters equipped with _____ ______ ___________ will
prohibit a motor from restarting automatically after a power failure. - correct answer-
ground-fault protection
Answers
A _____________ horsepower motor starter resembles a toggle switch with an overload
element. - correct answer-fractional
Line voltage rated sensing devices or pilot devices such as temperature, float or limit
switches should have contacts rated for 15 to _____amperes since they would have to
carry the same load as the manual starter. - correct answer-20
Single phase manual starters that are integral, not fractional, horsepower are intended
to control single phase motors up to ___ horsepower. - correct answer-5
Three phase manual starters are intended to control three phase motors up to ___
horsepower. - correct answer-10
The correct operation of a 3 phase overload relay on a manual starter is such that if any
one of the overloads should trip, a mechanical mechanism opens the load
_______________ and disconnects the motor from the line. - correct answer-contacts
Motor starting current is referred to as ____________________ current. - correct
answer-locked rotor current
Fuses which are intended to provide both short circuit protection and overload
protection are called ____________________ time delay fuses. - correct answer-dual-
element
All solenoids or coils that operate on alternating current must have a(n)
____________________ coil to maintain enough magnetism when the AC sine wave
crosses zero . - correct answer-shading
Contactors are equipped with contacts intended to connect high current loads to the
power line; these large contacts are called ____________________ contacts. - correct
answer-load or power
Mechanically held contactors and relays are often referred to as
____________________ contactors or relays. - correct answer-latching
Integral horsepower manual starters equipped with _____ ______ ___________ will
prohibit a motor from restarting automatically after a power failure. - correct answer-
ground-fault protection
