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Electrical Engineering Questions and Solutions Set 10

Electrical Engineering Questions and Solutions Set 10
Question:-
Option (A)
25 kw in (i) and 75 kw in (ii)
Option (B)
25 kw in (i) and 50 kw in (ii)
Option (C)
50 kw in (i) end 75 kw in (ii)
Option (D)
50 kw in (i) and 50 kw in (ii)
Correct Option:
Question Solution:
At half rated speed ,PaN


Pnew=(50/2)=25 kw
At 1.5 times rated speed by field control
P=Constant
P=50 kw
Question:-
Option (A)
50.0%
Option (B)
70.7%
Option (C)
141.4%
Option (D)
200.0%
Correct Option:
B
Question Solution:
X=(wi/wcu
Wi = iron loss of transformer
Wcu = Cu loss of transformer
Question:-
Option (A)
2.44 s
Option (B)
2.71 s
Option (C)
4.88 s
Option (D)
5.42 s
Correct Option:
A
Question Solution:
G=(P/cosj)=(500/0.9)MW=555.56 MVA
KE Sotred =(1/2)x2x(2nn/60)2
=1/2x27.5x103(2nx3000/60)2
H=(KE/MVA)=(1357.07/555.56)=2.44MJ/MVA
Question:-
Option (A)
only when x (t) is bounded
Option (B)
only when x (t) s non negative
Option (C)
only for t £ 0 if x(t) is bounded for t ³0
Option (D)
even when x (t) is not bounded
Correct Option:
D
Question Solution:
Y(t)=e-|x(t)|
E-x is always convergent even when ‘x’ is not bounded
E-x is bounded even through n2 is not bounded
Question:-
Option (A)
0.010 ohm
Option (B)
0.011 ohm
Option (C)
0.025 ohm
Option (D)
1.0 ohm
Correct Option:
C
Question Solution:
Rsh=Rm/m-1
Where , m = multiplication factor =500/100=5
Rsh=0.1/4=0.025 ohm
Question:-
Option (A)
4
Option (B)
8
Option (C)
16
Option (D)
32
Correct Option:
B
Question Solution:
Resolution = V0/2N
2N=3.5/14x10-3
N=8