Control Systems MCQ

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• If any term in the first column of a Routh array becomes zero, then
  ক

  Routh criterion cannot be used to determine stability

  খ

  Routh criterion can be used by substituting a small positive number for zero and completing the array

  গ

  Routh criterion can be used by substituting a big positive number for zero and completing the array

  ঘ

  Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
• Temperature is analogous to
  ক

  Voltage

  খ

  Flux

  গ

  Charge

  ঘ

  None of the above
• Which of the following is used to obtain output position in a position control system?
  ক

  Strain gauge

  খ

  Load cell

  গ

  Synchro

  ঘ

  Thermistor
• Which dc servomotor requires strongest permanent magnet?
  ক

  Slotted armature

  খ

  Surface wound armature

  গ

  Surface wound with stationary rotor

  ঘ

  Either A or B
• A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
  ক

  The gain is increased beyond upper critical value

  খ

  The gain is decreased below lower critical value

  গ

  Both A and B

  ঘ

  None of the above
• DC tachogenerator can be used in
  ক

  Speed control system

  খ

  Position control system

  গ

  Both A and B

  ঘ

  Neither A nor B
• The addition of a pole to the open loop transfer function pulls the root locus
  ক

  To the right

  খ

  To the left and making the system more stable

  গ

  Towards right or left depending on the position of new pole

  ঘ

  None of the above
• For any transfer function, the constant phase angle loci are
  ক

  A family of circles

  খ

  A family of straight lines

  গ

  Either (a) or (b)

  ঘ

  Neither (a) nor (b)
• The permanent magnet field system of brushless dc servo- motor is generally on
  ক

  Stator

  খ

  Rotor

  গ

  Partly on stator and partly on rotor

  ঘ

  Either (a) or (b)
• The distance of poles from origin depends on
  ক

  Uqndamped natural frequency

  খ

  Damping ratio

  গ

  Both A and B

  ঘ

  Neither A nor B
• Bandwidth is proportional to speed of response.
  ক

  True

  খ

  False
• In a simple on-off controller with differential gap, the magnitude of differential gap determines
  ক

  The level of accuracy

  খ

  The life of controller

  গ

  Both (a) and (b)

  ঘ

  Neither (a) nor (b)
• If poles lie in first quadrant, damping ratio is
  ক

  1

  খ

  More than 1

  গ

  less than 1

  ঘ

  Zero
• If the poles lie in second quadrant, damping ratio is
  ক

  1

  খ

  less than 1

  গ

  zero

  ঘ

  more than 1
• In force current analogy, displacement x is analogous to
  ক

  Charge

  খ

  Magnetic flux linkage

  গ

  Electrostatic energy

  ঘ

  Voltage
• Nyquist stability criterion uses open loop frequency response characteristics.
  ক

  True

  খ

  False
• Which control action can never be used alone?
  ক

  Proportional

  খ

  Derivative

  গ

  Integral

  ঘ

  Both (b) and (c)
• Magnetic amplifier is used for
  ক

  Voltage amplification

  খ

  Power amplification

  গ

  Current amplification

  ঘ

  Frequency amplification
• Nichols chart consists of
  ক

  Constant magnitude loci

  খ

  Constant phase angle loci

  গ

  Magnitude and phase angle loci in log-magnitude versus phase diagram

  ঘ

  None of the above
• In force current analogue, mechanical mobility is analogous to
  ক

  Impedance Z

  খ

  Admittance Y

  গ

  Reactance X

  ঘ

  Conductance G
• The sensor generally used in incremental optical encoder is
  ক

  LED

  খ

  LCD

  গ

  Photodiode

  ঘ

  Either (a) or (b)
• The poles with greater displacement from the real axis correspond to
  ক

  Higher frequencies of oscillations

  খ

  Stable response

  গ

  Lower frequencies of oscillations

  ঘ

  Unbounded output
• Which of the following is open loop system?
  ক

  Wind screen wiper

  খ

  Aqualing

  গ

  Respiratory system of animal

  ঘ

  System for controlling antirocket missiles
• In a two phasor servomotor, the direction of rotation of the rotating field depends on
  ক

  Magnitudes of voltages applied to the two stator windings

  খ

  Phase relation of voltages applied to the two stator windings

  গ

  Both magnitude and phase relationship of voltages applied to the two stator windings

  ঘ

  None of the above
• A system is highly oscillatory if
  ক

  Gain margin is high

  খ

  Gain margin is close to 1

  গ

  Gain margin is close to 1 or phase margin is zero

  ঘ

  Gain margin is high and phase margin is 180°
• M circles are symmetrical with respect to
  ক

  Real and imaginary axis

  খ

  M = 1 straight line and real axis

  গ

  M = 1 straight line and imaginary axis

  ঘ

  M = 1 straight line
• In control systems the output of sensor usually, is
  ক

  Analog electrical signal

  খ

  Digital electrical signal

  গ

  Mechanical signal

  ঘ

  Analog or digital electrical signal
• The effect of adding poles and zeros can be determined quickly by
  ক

  Nichols chart

  খ

  Nyquist plot

  গ

  Bode plot

  ঘ

  Root locus
• Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.
  ক

  True

  খ

  False
• Integral control action
  ক

  Removes offset

  খ

  May lead to oscillatory response

  গ

  Both (a) and (b)

  ঘ

  Neither (a) nor (b)