The permanent magnet field system of brushless dc servo- motor is generally on
The permanent magnet field system of brushless dc servo- motor is generally on
M circles are symmetrical with respect to
M circles are symmetrical with respect to
In a two phasor servomotor, the direction of rotation of the rotating field depends on
In a two phasor servomotor, the direction of rotation of the rotating field depends on
The distance of poles from origin depends on
The distance of poles from origin depends on
Lag compensation permits a high gain at low frequencies.
Lag compensation permits a high gain at low frequencies.
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
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
Transport lag usually exists in
Transport lag usually exists in
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.
In a simple on-off controller with differential gap, the magnitude of differential gap determines
In a simple on-off controller with differential gap, the magnitude of differential gap determines
A lead compensator
A lead compensator
The effect of adding poles and zeros can be determined quickly by
The effect of adding poles and zeros can be determined quickly by
Nichol’s chart is symmetric about – 180° axis.
Nichol’s chart is symmetric about – 180° axis.
DC tachogenerator can be used in
DC tachogenerator can be used in
Bandwidth is proportional to speed of response.
Bandwidth is proportional to speed of response.
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
Nichols chart consists of
Nichols chart consists of
Robotic manipulator arms mostly use
Robotic manipulator arms mostly use
Which of the following is open loop system?
Which of the following is open loop system?
The sensor generally used in incremental optical encoder is
The sensor generally used in incremental optical encoder is
If the poles lie in second quadrant, damping ratio is
If the poles lie in second quadrant, damping ratio is
Integral control action
Integral control action
The poles with greater displacement from the real axis correspond to
The poles with greater displacement from the real axis correspond to
In Bode plots the frequency at which two asymptotes meet is called corner frequency.
In Bode plots the frequency at which two asymptotes meet is called corner frequency.
In force current analogue, mechanical mobility is analogous to
In force current analogue, mechanical mobility is analogous to
Which of the following is used to obtain output position in a position control system?
Which of the following is used to obtain output position in a position control system?
The addition of a pole to the open loop transfer function pulls the root locus
The addition of a pole to the open loop transfer function pulls the root locus
A system is highly oscillatory if
A system is highly oscillatory if
Which dc servomotor requires strongest permanent magnet?
Which dc servomotor requires strongest permanent magnet?
Temperature is analogous to
Temperature is analogous to
Nyquist stability criterion uses open loop frequency response characteristics.
Nyquist stability criterion uses open loop frequency response characteristics.
In force current analogy, displacement x is analogous to
In force current analogy, displacement x is analogous to
The relative stability of a system is given by
The relative stability of a system is given by
A lag compensator
A lag compensator
Which of the following is correct?
Which of the following is correct?
If any term in the first column of a Routh array becomes zero, then
If any term in the first column of a Routh array becomes zero, then
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.
Which of the following features is not associated with Nichols chart?
Which of the following features is not associated with Nichols chart?
In root locus analysis the breakaway and break in points
In root locus analysis the breakaway and break in points
In control systems the output of sensor usually, is
In control systems the output of sensor usually, is
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.
If poles lie in first quadrant, damping ratio is
If poles lie in first quadrant, damping ratio is
Which control action can never be used alone?
Which control action can never be used alone?
For any transfer function, the constant phase angle loci are
For any transfer function, the constant phase angle loci are
Magnetic amplifier is used for
Magnetic amplifier is used for
For type 1 system the velocity lag error is
For type 1 system the velocity lag error is
In the field controlled motor the entire damping comes from
In the field controlled motor the entire damping comes from
