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1675.

A liner system is described by the state equations

where r and c are the input and output respectively. The transfer function is:
a. 1/ (s+1)
b. 1/(s+1)²
c. 1/ (s-1)
d. 1/ (s-1)²

asked in Electrical Paper-1, 1997

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1676.

The transfer function of a certain system is
Y(s)/U(s) = 1/(s⁴+5s³+7s²+6s+3)
The A, B matrix pair of the equivalent state-space model will be

asked in Electrical Paper-1, 1997

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1677.

The garn cross-over frequency and bandwidth of a control system are ω_cu and ω_bu respectively. A phase-lag network is employed for compensating the system. If the gain cross-over frequency and bandwidth of the compensated system are ω_cc and ω_bc respectively, then
a. ω_cc < ω_cu, ω_bc < ω_bu
b. ω_cc > ω_cu, ω_bc < ω_bu
c. ω_cc < ω_cu, ω_bc > ω_bu
d. ω_cc > ω_cu, ω_bc > ω_bu

asked in Electrical Paper-1, 1997

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1678.

In the control system shown in the given figure, the controller which can give zero steady-state error to a ramp input. with K = 9 is

a. Proportional type
b. Integral type
c. Derivative type
d. Proportional plus derivative type

asked in Electrical Paper-1, 1997

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1679.

The Nyquist plot of the open-loop transfer function G (s) H(s) is shown in the given figure. It indicates that

a. The open-loop system is unstable but the closed-loop system is stable
b. Both open-loop and closed-loop systems are unstable
c. Open-loop system is stable but closed loop system is unstable
d. Both open-loop and closed-loop systems are stable

asked in Electrical Paper-1, 1997

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1680.

The open-loop transfer function of a unity feedback control system is
G(s) = 30/[s(s+1)(s+T)]
where T is a variable parameter. The closed-loop system will be stable for all values of
a. T > 0
b. 0 < T < 3
c. T > 5
d. 3 < T < 5

asked in Electrical Paper-1, 1997

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