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1 . P i ntyp e i n s u l a t or s ar e ge n e ra l l y n o t u s e d f or vo l t ag e s e xc e e d i n

g

( a) 3 3K V ( b ) 2 5K V ( c ) 6 6 K V ( d ) 1 1K V

2 . T h e s a g of a tr a n s m i s s i o n l i n e c o n d u c t or i n s u m m e r i s

( a) s a m e a s i n w i nt e r ( b ) l e s s t h an t h at i n w i nte r ( c ) m o re t h an th a t i

n w i nte r ( d ) c o m p e n s a t e f o r s k i n e ff e c t

3 . T h e c u r re nt d raw n by t h e l i n e ow i n g t o c or o n a l os s i s

( a) d c ( b ) n o n - s i nu s o i d al ( c ) s i nu s o i d al ( d ) s q u a re

4 . T h e e ff e c t of i c e d e p o s i t i on o n c on d u c t o r i s to i n c r e a s e t h e

( a) r e s i s t a n c e of fl ow of c u r r e nt ( b ) we i g ht of t h e c o n d u c t o r ( c ) s

k i n e ff e c t ( d ) t r an s m i s s i on l os s e s

5 . B u n d l e d c o n d u c t or s re d u c e

( a) d e c r e a s e s t h e l i n e i n d u c t an c ( b ) s u r f a c e e l e c t r i c s t r e e s o f c

o n d u c t or ( c ) d e c r e a s e s t h e l i n e c a p ac i t a n c e ( d ) i n c r e a s e th e l i

n e r e a c t a n c e

6 . D i e l e c t r i c s t re ng t h o f r u b b e r i s a b o u t

( a) 2 0 K v /m m ( b ) 1 00 K v / m m ( c ) 1 0 K v /m m ( d ) 3 0 K v /m m

7 . I f t h e f r e q u e n c y of a t ra n s m i s s i on s y s t e m i s c a ng e d f r om 50 H L t

o 10 0H z t h e s tr i n g e ffi c i e n c y

( a) m ay i n c re as e o r d e c r e a s e d e p e n d i n g o n t h e l i n e p ar a m e t e r s (

b ) w i l l i n c r e as e ( c ) w i l l d e c r e as e ( d ) r e m a i n u n ch an g e d

8 . Towe r h e i ght d e p e n d s u p o n

( a) c o s t o f t h e c on d u c to r ( b ) Te n s i o n o f t h e c on d u c t o r ( c ) we i g ht

of t h e c o n d u c t o r ( d ) l e n g t h o f t h e s p an

9 . S t r i n gi n g ch a rt s c a n b e d r aw n b e twe e n

( a) t e m p e r a tu r e an d t owe r l e n g t h ( b ) t e m p e r a tu r e - te n s i on an d te

m p e r at u r e - s ag ( c ) t e n s i o n a n d s a g ( d ) s a g an d l e n gt h

1 0. C o n s i d e r t h e f ol l ow i n g s t a te m e nt : I n c as e o f s u s p n s i o n typ e i

n s u l a t or s , th e s t r i n g e ffi c i e n c y c an b e i mp r ove d by a u s i n g a l on g c r

o s s - ar m b u s i n g a g u ar d r i n g c g r ad i n g t h e i n s u l at o r d i s c s d r e d u

c i n g t h e c ro s s ar m l e n gt h o f th e s e s ta t e m e nt s

( a) ‘ a ’ a n d ‘ c ’ a r e c or r e c t ( b ) b , c an d d ar e c o rr e c t ( c ) ‘ b ’ a n d ‘ d ’

ar e c or r e c t ( d ) a a n d c ar e c or r e c t

1 1. T h e on l y ad va nt ag e s of c o ro n a i s t h a t i t

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( a) wo rk s as a s a f e ty va l ve f o r s u r g e s ( b ) m a ke s l i n e c u rr e nt s i nu s oi

d a l ( c ) o z on e g as i s p r o d u c e d ( d ) p r o d u c e s a pl e as i n g l u m i n o u s

gl ow

1 2. T h e ch ar g i n g c u r re nt d raw n by t h e c ab l e

( a) l e a d s t h e vo l t ag e by 1 8 0 0 ( b ) l a gs b e h i n d t h e vo l t ag e by 90 0 ( c )

l e a d s t h e vo l t ag e by 9 0 0 ( d ) l a gs t h e vol t a ge by 18 0 0

1 3. D i s r u p t i ve c o ro n a b e gi n s i n s m o o t h c yl i n d r i c a l c on d u c t o rs i

n ai r at N T P i f t h e e l e c t r i c fi e l d i nt e n s i ty a t t h e c on d u c t o r s u r f a c e

( a) 2 1. 1 K V ( avg ) /c m ( b ) 2 1. 1 K V ( rm s )/ c m ( c ) 2 1. 1 K v (r m s ) / m ( d

) 2 1. 1 K V ( p e a k) / c m

1 4. T h e i n s u l a t i on r e s i s t a n c e of a c ab l e o f l e n gt h 10 K m i s 1m Ω . For

a l e n g t h o f 10 0 km o f th e s a m e c a b l e , t h e i ns u l at i o n r e s i s t a n c e w i l

l b e

( a) 0 . 01 m Ω ( b ) 1 0m Ω ( c ) 0 . 1m Ω ( d ) 1 m Ω

1 5. T h e s k i n e ff e c t i n c on d u c t o r r e s u l t s i n

( a) d e c r e a s e i n t o ac r e s i s t a n c e ( b ) i n c r e a s e i n i ts d c r e s i s t an c e

( c ) d e c r e a s e i n i t s dc r e s i s t a n c e ( d ) i n c r e a s e s i n i t s ac re s i s t an c

e

1 6. T h e l on g e r t h e c r os s a rm . th e t h e s tr i n g e ffi e n c y

( a) l e s s e r ( b ) g re at e r ( c ) ve r y mu ch l e s s e r ( d ) m e d i u m

1 7. W i n d l o a d i n g i nc re as e t h e s ag i n th e d i r e c t i on of r e s u l t ant l o a d

i n g b u t

( a) d e c r e a s e s t h e t e n s il e s t r e n g th ( b ) i n c r e a s e s t h e h o ri z ont al c

o m p on e nt ( c ) d e c r e a s e s t h e ve r t i c al c o m p on e nt ( d ) i n c r e a s e s b

o th h or i z o nta l a n d ve r t i c al c o m p on e n e ts

1 8. T h e s t r in g e ffi c i e n c y i s g i ve n by

( a) V ol t a g e a c r o s s to p u ni t N o. of i n s u l a to r s ×v o l ta g e c r o s s s t r i ng

( b ) v o l ta g e a c r o s s s tr i n g N o. of i n s u l a to r s ×V ol t a g e a c r o s s bo t to

m u n i t ( c ) V ol t a g e a c r o s s bo t to m u n i t N o. of i n s u l a to r s ×v o l ta g e c

r o s s s t r i ng ( d ) v o l ta g e a c r o s s c o n du c to r N o. of i n s u l a to r s ×V ol t a

g e a c r o s s t op u ni t

1 9. W h i l e l ay i n g 33 K v u n d e r g r ou n d c ab l e t h e m i n i mu m b e n d i ng r

a d i u s s h ou l d b e

( a) 3 0D ( b ) 1 2D ( c ) 1 00 D ( d ) 2 00 D D - i s t h e c a bl e d i a m e t e r

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2 0. S o l i d ty p e c a b l e s ar e n ot c o n s i d e r e d s u i t ab l e f o r op e r at i n g vol

t ag e s e x c e e d i n g 6 6 K v b e c au s e

( a) i n s u l a t i on m ay m e l t d u e t o h e at i n g ( b ) s k i n e ff e c t d o m i n at e s

o n t h e c on d u c t o r ( c ) t h e r e i s a c o ro n a l o s s b / w c on d u c to r a n d s h e

a t h m a te ri a l ( d ) t h e r e i s a d a ng e r o f b re ak d ow n o f i n s u l at i o n b e c a

u s e of f o n n at i o n o f voi d s i n t h e l aye r s o f d i e l e c t r i c

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