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WorksheetsInduction Motor Quiz
Total questions: 14
Worksheet time: 23mins
What are the main parts of an induction motor?
lamination steel, winding
conductor bar, winding
Stator, Rotor
What is the formula to calculate the rotating magnetic field speed of an induction motor?
(number of poles / frequency) * 120
(120 * frequency) / number of poles
(frequency * number of poles) / 120
What is one advantage of induction motors?
Low cost and simple construction
Limited power output and slow speed
Low efficiency and high maintenance
input power = 120 W
air gap power = 50 W
converted power = 45 W
mechanical losses = 10 W
find output power
55 W
35 W
105 W
15 W
There are 3 ways for starting torque and speed control except
auto transformer
primary resistor
star delta
capacitor bank
frequency = 50 Hz, motor speed = 980 rpm, pole = 6
determine slip
0.02
0.04
One of induction motor test is
block rotor test
ac resistance test
short circuit test
change 1500 rpm to rad/s
0.25
157.08
6.37
What is one disadvantage of induction motors?
Less reliable than other types of motors
More expensive than other types of motors
speed not constant
determine SCL
50W
80W
30W
which one is rotor input power formula
10 hp, 50 Hz with 6 poles, slip = 2%, friction lossess = 200 W
find developed torque.
76.2 Nm
73.1 Nm
72.2 Nm
Determine Plosess
135W
100W
155W
Y connected induction motor , 50 Hz, 415V, 8 pole, 4.2% slip
Determine input power
57.9kW
11.14kW
100.28kW
33.43kW
