Exercise: Automatic Control Systems

Questions for: Automatic Control Systems

Which of the following can be used as a rotating amplifier in a control system?
  1. Amplidyne
  2. Separately excited dc generator
  3. Synchro
  4. Self excited dc generator
Select the answer from the following codes:
A:
3 and 4
B:
1 and 2
C:
1, 2 and 3
D:
all
Answer: B
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Which of the following features is not associated with Nichols chart?
A:
(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
B:
It is symmetric about -180°
C:
M loci are centred about (0 dB, -180°) point
D:
The frequency at intersection of G(jω) locus and M = +3 dB locus gives bandwidth of closed loop system
Answer: D
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If any term in the first column of a Routh array becomes zero, then
A:
Routh criterion cannot be used to determine stability
B:
Routh criterion can be used by substituting a small positive number for zero and completing the array
C:
Routh criterion can be used by substituting a big positive number for zero and completing the array
D:
Routh criterion can be used by substituting a small negative number for zero and completing the array
Answer: B
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In force current analogue, mechanical mobility is analogous to
A:
impedance Z
B:
admittance Y
C:
reactance X
D:
conductance G
Answer: A
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The effect of adding poles and zeros can be determined quickly by
A:
Nichols chart
B:
Nyquist plot
C:
Bode plot
D:
Root locus
Answer: C
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