"3 phase TPC"
200°F (95°C) is the - ANS-maximum temperature at which bearings may be safely operated
A four-pole, three-phase motor has _____ coils. - ANS-twelve
A four-pole, three-phase motor has _____ coils. - ANS-twelve
A lack of torque, a decrease in speed, and growling noises are all indications of a(n) -
ANS-open rotor circuit
A motor rated at 2 hp at full load can develop __________ hp if it delivers its maximum
torque. - ANS-3 to 4.5
A relay with inverse-time characteristics operates - ANS-faster as the current increases
A relay with inverse-time characteristics operates - ANS-faster as the current increases
A synchronous motor is unique in that its speed is controlled by the ____________ of the
power supply and is not affected by variations in the ____________ on the motor. -
ANS-frequency; load
A synchronous motor using an amortisseur winding for starting is electrically the same as a
____________ motor - ANS-squirrel-cage induction
A variable-torque motor produces torque that ____________ and power output that
____________ when the speed doubles. - ANS-doubles; quadruples
A wound-rotor motor is always started with _____ in the rotor circuit. - ANS-maximum
resistance
Acceptable methods of cleaning insulation in auxiliary generating equipment include wiping it
with a clean cloth, blowing it off with low-pressure air, using a vacuum cleaner, and cleaning
it with a(n) - ANS-approved solvent
Acceptable methods of cleaning insulation in auxiliary generating equipment include wiping it
with a clean cloth, blowing it off with low-pressure air, using a vacuum cleaner, and cleaning
it with a(n) - ANS-approved solvent
All of the following are benefits of system grounding, EXCEPT - ANS-allows service to be
maintained in entire circuit until the fault is located
Although alternators can be built with any number of phases, there is little advantage in
using more than - ANS-three
An engine operating at 1714 rpm and driving a 28 pole generator or one operating at 1846
rpm and driving a ____________ pole generator is the most practical generator set for 400
Hz otput - ANS-26
An inductor connected in series with the motor winding is found in a(n) - ANS-reactor starter
Angular loads are caused by forces applied to the bearing - ANS-both parallel and
perpendicular to the shaft
At full load, a motor connected to the line will do all of the following EXCEPT -
ANS-decrease its internal temperature
Because the rotor of a synchronous motor does not depend on induction to produce current,
the ____________ can be larger than in an induction motor. - ANS-Air gap
During plugging, the current in an induction motor is higher than the locked-rotor current,
causing a(n) - ANS-power loss
Hunting can be reduced on engine-driven and some turbine-driven salient-pole alternators
by including a(n) - ANS-amortisseur winding
200°F (95°C) is the - ANS-maximum temperature at which bearings may be safely operated
A four-pole, three-phase motor has _____ coils. - ANS-twelve
A four-pole, three-phase motor has _____ coils. - ANS-twelve
A lack of torque, a decrease in speed, and growling noises are all indications of a(n) -
ANS-open rotor circuit
A motor rated at 2 hp at full load can develop __________ hp if it delivers its maximum
torque. - ANS-3 to 4.5
A relay with inverse-time characteristics operates - ANS-faster as the current increases
A relay with inverse-time characteristics operates - ANS-faster as the current increases
A synchronous motor is unique in that its speed is controlled by the ____________ of the
power supply and is not affected by variations in the ____________ on the motor. -
ANS-frequency; load
A synchronous motor using an amortisseur winding for starting is electrically the same as a
____________ motor - ANS-squirrel-cage induction
A variable-torque motor produces torque that ____________ and power output that
____________ when the speed doubles. - ANS-doubles; quadruples
A wound-rotor motor is always started with _____ in the rotor circuit. - ANS-maximum
resistance
Acceptable methods of cleaning insulation in auxiliary generating equipment include wiping it
with a clean cloth, blowing it off with low-pressure air, using a vacuum cleaner, and cleaning
it with a(n) - ANS-approved solvent
Acceptable methods of cleaning insulation in auxiliary generating equipment include wiping it
with a clean cloth, blowing it off with low-pressure air, using a vacuum cleaner, and cleaning
it with a(n) - ANS-approved solvent
All of the following are benefits of system grounding, EXCEPT - ANS-allows service to be
maintained in entire circuit until the fault is located
Although alternators can be built with any number of phases, there is little advantage in
using more than - ANS-three
An engine operating at 1714 rpm and driving a 28 pole generator or one operating at 1846
rpm and driving a ____________ pole generator is the most practical generator set for 400
Hz otput - ANS-26
An inductor connected in series with the motor winding is found in a(n) - ANS-reactor starter
Angular loads are caused by forces applied to the bearing - ANS-both parallel and
perpendicular to the shaft
At full load, a motor connected to the line will do all of the following EXCEPT -
ANS-decrease its internal temperature
Because the rotor of a synchronous motor does not depend on induction to produce current,
the ____________ can be larger than in an induction motor. - ANS-Air gap
During plugging, the current in an induction motor is higher than the locked-rotor current,
causing a(n) - ANS-power loss
Hunting can be reduced on engine-driven and some turbine-driven salient-pole alternators
by including a(n) - ANS-amortisseur winding
