08-03-2012, 01:17 PM
ELECTRICAL ENGINEERING PAPER-I
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1. Consider the following statements with
reference to a system with velocity error
constant Ky = 1000
1. The system is stable.
2. The system is of type 1
3. The test signal used is a step input.
Which of these statements are correct?
a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1, 2 and 3
2. Which one of the following statements is
NOT of correct?
a. With the introduction of integral
control, the steady state error increases
b. The generalised error coefficients
provide a simple way of determining
the nature of the response of a
feedback control to any arbitrary input
c. The generalized error coefficients lead
to calculation of complete steady state
response without actually solving the
system differential equation
d. For a type-1 system, the steady state
error for acceleration input is infinite
3. Consider the following statements with
reference to the root loci of the
characteristic equation of unity feedback
control system with an open loop transfer
function of
( ) ( 1)( 3)( 5)
( 2)
G s K s s s
s s
1. Each locus starts at an open loop pole
and ends either at an open loop zero or
infinity
2. Each locus starts at an open loop pole
or infinity and ends at an open loop
zero.
3. There are three separate root loci.
4. There are five separate root loci.
Which of these statements are correct ?
a. 2 and 3
b. 2 and 4
c. 1 and 3
14. Match List I with List II and select the
correct answer:
List I (Component)
A. Input potentiometer in d.c. system
B. Synchro pair in a.c. system
C. Motor
D. Feedback tachogenerator
List II (Purpose)
1. Actuator
2. Error detector
3. Transducer
A B C D
a. 3 2 3 1
b. 2 3 1 3
c. 2 3 3 1
d. 3 2 1 3
15. Which one of the following statements is
NOT correct?
a. The action of bellows in pneumatic
control system is similar to that of a
spring
b. The flapper value converts large
changes in the position of the flapper
into small changes in the back pressure
c. The common name of pneumatic
amplifier is pneumatic relay
d. The transfer function of a pneumatic
actuator is of the form :
