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Automatic Control Systems
In the field controlled motor the entire damping comes from
Field resistance
Back emf
Armature resistance
Motor friction and load
Field resistance
Back emf
Armature resistance
Motor friction and load
Answer
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Related Question
Automatic Control Systems
Nichols chart consists of
Constant magnitude loci
None of these
Magnitude and phase angle loci in log-magnitude versus phase diagram
Constant phase angle loci
Constant magnitude loci
None of these
Magnitude and phase angle loci in log-magnitude versus phase diagram
Constant phase angle loci
Answer
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Automatic Control Systems
In root locus analysis the breakaway and break in points
Always occur in complex conjugate pairs
Either lie on the real axis or occur in complex conjugate pairs
None of these
lie on the real axis
Always occur in complex conjugate pairs
Either lie on the real axis or occur in complex conjugate pairs
None of these
lie on the real axis
Answer
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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
3 and 4
1, 2 and 3
All
1 and 2
3 and 4
1, 2 and 3
All
1 and 2
Answer
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Automatic Control Systems
If any term in the first column of a Routh array becomes zero, then
Routh criterion can be used by substituting a small positive number for zero and completing the array
Routh criterion can be used by substituting a big positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
Routh criterion cannot be used to determine stability
Routh criterion can be used by substituting a small positive number for zero and completing the array
Routh criterion can be used by substituting a big positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
Routh criterion cannot be used to determine stability
Answer
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Automatic Control Systems
If poles lie in first quadrant, damping ratio is
less than 1
Zero
More than 1
1
less than 1
Zero
More than 1
1
Answer
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