20. Power absorbed by a three-phase load is given by
(a)
3VI
PP
sinf
(b)
3VI
LL
sinf
(c)
3VI
LL
cosf
(d)
3VI
PP
cosf
21. The phenomenon of neutral shift occurs in
(a) three-phase three-wire system feeding balanced star-connected load
(b) three-phase three-wire system feeding an unbalanced star-connected load.
(c) three-phase four-wire system
(d) none of these
22. Neutral shift voltage is given by
(a)
V
VVV
ZZZ
on
anbncn
abc
=
++
++
(b)
V
VVV
YYY
on
anbncn
abc
=
++
++
(c)
V
VYVYVY
ZZZ
on
ananbn
bcnc
abc
=
++
++
(d) ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.