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iNDUCTION MOTOR

Total questions: 11

Worksheet time: 6mins

Name
Class
Date
1.

Induced power equation is....

a)

3I2 Rrs(1s)3I^2\ \frac{R'_r}{s}\left(1-s\right)

b)

3I2 Rrs3I^2\ \frac{R'_r}{s}

2.

motor speed = 950rpm, pole = 6, freq = 50Hz, find slip,s.

a)

0.05

b)

0.5

c)

0.01

d)

0.1

3.

induction motor rotor type

a)

stator & rotor

b)

slip ring & wound

4.

induction motor test

a)

load test

b)

no load test

c)

dc power test

5.

Given line voltage & current of Y connected induction motor are 415V, & 103 A with power factor 0.85 lagging. Determine input power.

a)

48.86W

b)

36.33W

c)

62.93W

6.

Advantages of induction motor

a)

cheaper

b)

high maintenance

c)

speed constant

7.

Ratio of slip speed and synchronous speed is....

a)

rotation magnetic field speed

b)

slip

c)

rotor frquency

8.

Given, mechanical power is 33.75kW, slip = 0.043, find Rotor Input Power (RIP)

a)

35.27kW

b)

784.88kW

c)

1451.25W

d)

32.3kW

9.

Change 1500rpm to rad/s

a)

14323.94

b)

9424.78

c)

157.08

10.

3I2 Rs3I^2\ R_s this formula refer to

a)

stator core loss

b)

stator copper loss

c)

rotor input power

d)

rotor copper loss

11.

find efficiency

a)

85.5%

b)

88.5%

c)

83.7%