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WorksheetsInduction Machine
Total questions: 12
Worksheet time: 9mins
The advantage of Slip Ring IM is
High starting voltage
Regulation
High starting torque
None
The rotor Copper loss is
1-s rotor input
rotor input
s * rotor input
s *s rotor input
Stroboscopic method is used for finding -------- in IM
Torque
Power
Current
Slip
A 4 pole 3 phase induction motor at supply frequency 50 Hz has a synchronous speed of
1000 rpm
1200 rpm
1500 rpm
1250 rpm
Frequency of rotor of IM is
f / s
s / f
s * f
None
No load and blocked rotor test are necessary for
Power diagram
Circle diagram
Torque
All the above
During Crawling IM works at speed of
Ns
Ns / 10
Ns / 7
0
Which is starting method used for Slip Ring IM
DOL
Star Delta
Rotor Rheostat
Auto transformer
Give the condition for maximum torque
R2 = X2
R2 = sX2
R2 = 2 X2
2R2 = X2
In a Double Cage IM, outer cage gives
High reactance
High resistance
Both
None
In Star Delta starter starting current is ------ of normal current
1 / 5
1 / 2
1 / 3
None
The relation P2 : PM: I*I*R is
1: (1-s):s
1 :s:(1-s)
1:1:1
(1-s):1:1
