WorksheetsAc motor
Total questions: 9
Worksheet time: 5mins
REE Board Exam October 1997.
A single phase induction motor is rated 5 hp, 75% power factor and 220 volts. What is its full load current?
22.5 amperes
20.5 amperes
16.5 amperes
18.5 amperes
EE Board Exam April 1990
A 5 hp, 3-phase motor draws current when connected to 230 V. Determine the current drawn by the motor if the power factor is 0.90 and efficiency of 83%.
12.53 A
15.13 A
13.25 A
13.25 A
REE Board Exam September 2001
Which of the following is not a reason why a single phase induction motor will not run?
one of the current is made out of phase between the lines
hysteresis
shaded poles
two windings displaced from each other
REE Board Exam October 1996
The following are types of AC motor starters except one
reactance starter l
wye-delta starter
across the line starter
capacitance starter
Motor starting device that will reduce the voltage impressed at motor’s terminals during starting periods.
autotransformer
primary resistor-type
wye-delta starter
all of these
Basically all electric motors operate on the principle of repulsion or ______.
induction
magnetism
resistance
capacitance
The principle of operation of induction motor is based on
Fleming’s right hand rule
rotating magnetic field
Faraday’s law
Ohm’s law
A compensator is a device that is used with alternating current motors to ______
boost the supply voltage during starting periods
compensate for low power factor when motor is not fully loaded
reduce the supply voltage during starting periods
compensate for voltage drop in the circuit
A single-phase motor provided with a squirrel cage winding on its rotor in addition to its regular winding is called
split-phase induction motor
repulsion induction motor
universal motor
repulsion-start induction motor
