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NTSE Stage 2 SAT 2018 Exam Question Paper
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© examsnet.com
Question : 39
Total: 100
Three electric bulbs of rating 40 W – 200 V; 50 W – 200 V and 100 W – 200 V are connected in series to a 600 V supply. What is likely to happen as the supply is switched on?
Only 50 W bulb will fuse
Both 40 W and 50 W bulbs will fuse.
All the three bulbs will emit light with their rated powers.
100 W bulb will emit light of maximum intensity.
Validate
Solution:
Resistance of 40 W – 200 V, 50 W – 200 V, 100 W – 200 V arerespectively
R
40
=
V
2
P
40
=
200
×
200
40
=
1000
Ω
R
50
=
800
Ω
and
R
100
=
400
Ω
I
=
600
100
+
800
+
400
=
600
2200
=
0.2727
A
I
40
=
P
1
V
=
40
200
=
0.2
A
I
50
=
P
2
V
=
50
200
=
5
20
=
0.25
A
I
100
=
P
3
V
=
100
200
=
.5
A
Clearly, 0.2 A & 0.25 A < 0.27 A hence both 40 W and 50 W bulbs will fuse.
© examsnet.com
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