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Automatic Control Systems
See What Others Are Saying!
Question
In the given figure
x
6
=
Options
A. d
e
(
ax
1
+
bx
2
+
cx
3
)
B. (
a
+
b
+
c
) (
x
1
+
x
2
+
x
3
) (
d
+
e
)
C. (
ax
1
+
bx
2
+
cx
3
) (
d
+
e
)
D.
a b c d e
(
x
1
+
x
2
+
x
3
)
Correct Answer
d
e
(
ax
1
+
bx
2
+
cx
3
)
Explanation
The input
x
1
is multiplied by
a
,
x
2
, by
b
and
x
3
by
c
. The sum total is multiplied by
d
and
e
.
More questions
1. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is
Options
A. 1250
B. 330
C. 2500
D. 8330
Show Answer
Scratch Pad
Discuss
Correct Answer: 1250
2. An unmodulated voltage 10
V
effective is applied to a dioxide detector in which load resistance is 4 x 10
-5
ohms. A micrometer shows that the rectified DC current in this resistance is 30
A
. The input resistance of the detector is
Options
A. 114 kW
B. 336 kW
C. 384 kW
D. 455 kW
Show Answer
Scratch Pad
Discuss
Correct Answer: 336 kW
3. For a BJT
a
= 0.98, then ? =
Options
A. 0.02
B. 0.5
C. 4.9
D. 48
Show Answer
Scratch Pad
Discuss
Correct Answer: 48
Explanation:
4. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
Options
A. the majority carrier density is doubled
B. the minority carrier density is doubled
C. the minority carrier density becomes 4 times the original value
D. both the majority and minority carrier densities double
Show Answer
Scratch Pad
Discuss
Correct Answer: both the majority and minority carrier densities double
Explanation:
As the intrinsic carrier concentration is doubled, the concentration of both electrons and holes is doubled.
5. A cycloconverter is
Options
A. ac-dc converter
B. dc-ac converter
C. dc-dc converter
D. ac-ac converter
Show Answer
Scratch Pad
Discuss
Correct Answer: ac-ac converter
Explanation:
It changes ac at frequency
f
into ac at a frequency different from
f
.
6. Consider the following DO statement in Fortran 77
DO 52 N = 1, 10, 3
The number of DO loop executions in the above statement is
Options
A. 1
B. 10
C. 3
D. 4
Show Answer
Scratch Pad
Discuss
Correct Answer: 4
Explanation:
Do statement is executed when N = 1, 4, 7, 10,
i.e.,
a total of 4 times.
7. In a single phase semiconverter feeding a highly inductive load, the load current is
Options
A. sinusoidal
B. nearly constant
C. absolutely constant
D. rectangular
Show Answer
Scratch Pad
Discuss
Correct Answer: nearly constant
8. If
t
on
and
t
off
are the turn on and turn off times of a thyristor, then
Options
A.
t
on
and
t
off
are almost equal
B.
t
on
>>
t
off
C.
t
off
>>
t
on
D.
t
on
is about twice
t
off
Show Answer
Scratch Pad
Discuss
Correct Answer:
t
off
>>
t
on
Explanation:
Turn on time is less than 3 ?s while turn off time is between 10-300 ?s.
9. Which inverter circuit uses coupled inductors?
Options
A. Modified McMurray full bridge inverter
B. McMurray Bedford half bridge inverter
C. Modified McMurray Bedford half bridge inverter
D. Both (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: Both (b) and (c)
10. If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
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