ET ONLINE 3

1 . R ot o r of i n d u c t i on m ot o r i s al o n g of a
( a) M e ch a n i c a l c l u t ch ( b ) g e ar tr a i n s ( c ) s p r i n g ( d ) d a s h p o t

2 . T h e r ot or w i n d i n g of a 3- p h as e wo u n d r o to r i n d u c t i o n m ot o r i s ge n e ra l l y c o n n e c t e d
( a) d e l t a ( b ) S t ar ( c ) p a rt i a l l y s t ar p ar t i al l y d e l ta ( d ) r e ve r s e d e l t a

3 . A n i n d u c ti o n m o t or wo r k s w i t h ( a) a c a n d d c b ot h ( b ) n e i t h e r a c n o r d c ( c ) D c o n l y ( d ) a c o n l y

4 . I f t h e s l i p of a 3- p h as e i n d u c t i o n m o to r i n c r e a s e s , t h e p . f of t h e r o t or c i r c u i t
( a) I s i n c r e a s e d ( b ) r e m a i n s u n ch a n ge d ( c ) i s d e c r e a s e d ( d ) r e m a i n s s a m e

5 . T h e nu mb e r of s t a to r a n d r ot o r s l o t s a r e m a d e p r i m e to e ach ot h e r ( a) t o r e d u c e ove ra l l d i m e ns i on s ( b ) t o i m p r ove p owe r f a c t or
( c ) t o r e d u c e t h e t e n d e n c y o f t h e m ag n e t i c l o ck i n g ( d ) To i m p rove e ffi c i e n c y

6 . I n an i n d u c t i on m o t or i f t h e r a t i o of t h e r o to r o u tp u t to r o t or i n p u t i s 0 . 96 , t h e p e r c e nt s l i p i s
( a) 5 . 16 % ( b ) 4 % ( c ) 0 . 04 % ( d ) 5 . 87 %

7 . I n a 3- Φ i n d u c t i o n m o to r , t o rq u e i s r e l a t e d w i t h s u p p l y vo l t ag e as
( a) T α V 1 / 2 ( b ) T α V 2 ( c ) T α 1 / v ( d ) T α V

8 . A 3- p h as e i n d u c t i on m ot o r i s op e r a t i n g a t s l i p S . I f i t s two s u p p l y l e a d s ar e i nt e r ch an g e d , th e n i t s s l i p a t t h a t i n s t a nt w i l l b e
( a) 1 - s ( b ) 2 - s ( c ) 2 +s ( d ) 1 +s

9 . W h e n l oa d i s p l ac e d o n a 3 - p h a s e i n d u c t i o n m o t or , i t s s l i p ( a) i n c r e a s e s f o r s o m e va l u e an d re ma i n s c on s ta nt
( b ) r e m a i n s c o n s t ant ( c ) I n c r e a s e s ( d ) d e c r e a s e s

1 0. T h e e ffi c i e n c y of an i n d u c t i on m ot o r A i s 89 % a n d t h a t of B i s 8 0 % . T h e s i z e o f m ot o r A i s
( a) b i g ge r th a n ( b ) S m a l l e r t h an A ( c ) e q u a l t o B ( d ) s m a l l e r t h a n B

1 1. I n a s l i p r i n g i n d u c t i on m ot i o n i f th e r ot o r r e s i s t a n c e is i n c r e a s e d th e n ( a) s t a rt i n g t o rq u e an d e ffi c i e n c y i n c re as e ( b ) s t a rt i n g t o rq u e d e c r e a s e s b u t e ffi c i e n c y i n c r e as e s
( c ) s t a rt i n g t o rq u e i n c r e as e b u t e ffic i e n c y d e c re as e s
( d ) s t a rt i n g t o rq u e an d e ffi c i e n c y d e c r e as e

1 2. T h e t or q u e s l i p ch ar a c t e r i s t i c o f a n i n d u c ti o n m o t or i s a p p rox i m at e l y a /a n
( a) hy p e r b o la ( b ) s t r ai g ht l i n e ( c ) p a ra b o l a ( d ) r e c t a n gu l a r p ar a b o l a

1 3. I n a s q u i rr e l c a ge i n d u c t i on m ot or h i gh s t at i n g t or q u e i s a ch i e ve d by u s i n g ( a) D ou b l e c a ge r ot o r ( b ) L ow r e s i s t a n c e a c r os s t h e ro t or c i r c u i t ( c ) i n n e r - r i n g typ e ( d ) H i g h r e s i s t a n c e i n s e r i e s w i t h t h e ro t or c i rc u i t

1 4. C r aw l i n g of i n d u c t i on m ot or o c c u r s d u e t o
( a) h a rm o n i c s yn ch r o n ou s t or q u e s , h ar m o n i c i n d u c t i o n t or q u e s , v i b ra t i on to r q u e s ( b ) h a rm o n i c i n d u c ti o n t o r qu e s ( c ) v i b r at i o n t or q u e s ( d ) h a rm o n i c s yn ch r o n ou s t or q u e s

1 5. T h e Powe r s c a le o f c i r c l e d i a gr am of a n i n d u c t i on m ot o r i s d e t e rm i n e d f r o m t e s t d a t a on l y.
( a) s t a to r r e s i s ta n c e ( b ) S l i p ( c ) O p e n c i rc u i t ( d ) S h o rt - C i rc u i t

1 6. D i r e c t - o n - l i n e s ta r t e r c a n b e u s e d f or s m al l c a p ac i ty i n d u c t i o n m ot o r s . ( a) s q u i r r e l c a ge ( b ) s q u i r r e l c a ge a n d wo u n d r ot o r ty p e s ( c ) n e i t h e r s qu i r r e l n o r wo u n d ( d ) wo u n d r ot o r

1 7. T h e d i s a d va nt a ge of s t a r- d e l t a s t ar i n g o f a 3 - p h a s e i nd u c ti o n m o t or i s t h at
( a) t h e s ta r t i n g t o r qu e i s on e - t h i rd of t h at i n c a s e o f d e l ta c on n e c ti o n s ( b ) t h e s ta r t i n g t o r qu e i n c r e a s e s an d th e m o to r r u n s w i th j e r k s ( c ) a t t h e t i m e o f ch a ng e - ove r f r om s t a r t o d e l t a c on n e c t i o n s a vo l t ag e p e a k i s p r o d u c e th a t m ay c a u s e d a m ag e t o t h at i n s u l at i o n ( d ) d u r i n g s t ar t i n g p owe r l os s e s ar e i n c re as e d

1 8. S p e e d s h i g h e r t h an s y n ch r on o u s s p e e d c an b e h a d by
( a) r ot o r s l i p p owe r c ont r ol ( b ) f r e q u e n c y c ont r ol ( c ) l i n e vo l t ag e c o nt ro l ( d ) R ot o r r e s i s t a n c e c o nt ro l

1 9. S m o ot h s p e e d c ont r ol c a n b e ach i e ve d by ( a) r ot o r s l i p p owe r c ont r ol on l y ( b ) Va r i at i o n o f s u pp l y f r e q u e n c y o n l y
( c ) b o t h r ot o r s l i p p owe r c ont ro l var i a t i on of s u p p l y f r e q u e n c y ( d ) r ot o r r e s i s t a n c e c ont r ol on l y

2 0. I n a 3- p h as e i n d u c t i on m ach i n e , ge n e r at i n g a n d b r ak i n g o p e r at i o n s t a ke p l ac e i n th e r an g e o f s l i p s gi ve n by ( a) G e n e ra t i n g : 0 > s > -1 ; b r a ki n g : 1 > s > 0 . ( b ) G e n e ra t i n g : 1 > s > 0 ; b r a ki n g : 0 > s > -1 .
( c ) G e n e ra t i n g : 0 > s > -1 ; b r a ki n g : s > 1 . ( d ) G e n e ra t i n g : s > 1 ; b r a ki n g : 1 > s > 0

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