EEGATE-2009
www.gateforum.com
© All rights reserved by GATE Forum Educational Services Pvt. Ltd. No part of this booklet may be reproduced or utilized in any form without the
written permission. Discuss this question paper at www.gatementor.com.
1
GATE - 2009
Answer Keys
1
B
2
C
3
A
4
D
5
B
6
D
7
A
8
A
9
B
10
D
11
D
12
B
13
A
14
C
15
B
16
C
17
C
18
D
19
B
20
C
21
D
22
C
23
A
24
A
25
D
26
C
27
D
28
D
29
B
30
C
31
C
32
A
33
A
34
B
35
B
36
A
37
A
38
C
39
A
40
D
41
D
42
C
43
A
44
C
45
A
46
C
47
B
48
C
49
A
50
A
51
B
52
C
53
D
54
A
55
C
56
B
57
A
58
A
59
B
60
D
Q.1
(B)
Since all the applied voltage appears across it.
Q.2
(C)
1
2
3
u
Let y= , % error in y = % error in u - % error in v
v
Here u = G G , v = G
+
Q.3
(A)
When diode is ON, i=1mA. When diode is OFF, i is zero after small reverse
recovery time.
Q.6
(D)
2000V
Internal resistance =
5
400A
Internal voltage drop = 200A 5 =1000V
= Ω
× Ω
Q.7
(A)
It is a balanced Wheatstone bridge.
Q.9
(B)
2
EV
V
P
sin
sin
X
X
=
δ ≈
δ
Q.12 (B)
Q.13 (A)
All other XNOR, NOR, NAND gates can be derived from NOT, OR, AND gates.
Q.14 (C)
EEGATE-2009
www.gateforum.com
© All rights reserved by GATE Forum Educational Services Pvt. Ltd. No part of this booklet may be reproduced or utilized in any form without the
written permission. Discuss this question paper at www.gatementor.com.
2
1 1
1 2
1
1
1 1
1
1
1 2
2
1
2
N
M
L L ; L
,
B A
i
M
20 20
M
A A
4 2
M
10 10
M
M
2
φ
=
=
φ =
×
∴
∝
=
=
=
×
=
Q.15 (B)
B is stable as slip ≈ 1
A is unstable as slip ≈0
Q.17 (C)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
1
2
1
1
1
2
a 1.42; GM = -20 log a
Since a>1, GM will be negative and unstable
1
j T
Now, G j H j
j C 1
j T
(Assuming one pole i