Electrical Control Systems MCQ

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• Which of the following is the input to a controller ?
  ক

  Servo signal

  খ

  Desired variable value

  গ

  Error signal

  ঘ

  Sensed signal
• Which of the following is the non-linearity caused by servomotor ?
  ক

  Static friction

  খ

  Backlash

  গ

  Saturation

  ঘ

  None of the above
• Is a part of the human temperature control system.
  ক

  Digestive system

  খ

  Perspiration system

  গ

  Ear

  ঘ

  Leg movement
• A conditionally stable system exhibits poor stability at
  ক

  low frequencies

  খ

  reduced values of open loop gain

  গ

  increased values of open loop gain

  ঘ

  none of the above
• Which of the following is the best method for determining the stability and transient response ?
  ক

  Root locus

  খ

  Bode plot

  গ

  Nyquist plot

  ঘ

  None of the above
• The transient response of a system is mainly due to
  ক

  inertia forces

  খ

  internal forces

  গ

  stored energy

  ঘ

  friction
• In case of type-1 system steady state acceleration is
  ক

  unity

  খ

  infinity

  গ

  zero

  ঘ

  10
• An increase in gain, in most systems, leads to
  ক

  smaller damping ratio

  খ

  larger damping ratio

  গ

  constant damping ratio

  ঘ

  none of the above
• In thermal-electrical analogy charge is considered analogous to
  ক

  heat flow

  খ

  reciprocal of heat flow

  গ

  reciprocal of temperature

  ঘ

  temperature

  ঙ

  none of the above
• In liquid level and electrical system analogy, voltage is considered analogous to
  ক

  head

  খ

  liquid flow

  গ

  liquid flow rate

  ঘ

  none of the above
• In electrical pneumatic system analogy the current is considered analogous to
  ক

  velocity

  খ

  pressure

  গ

  air flow

  ঘ

  air flow rate
• Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal.
  ক

  acceleration

  খ

  velocity

  গ

  position

  ঘ

  all of the above
• In order to increase the damping of a badly underdamped system which of following compensators may be used ?
  ক

  Phase-lead

  খ

  Phase-lag

  গ

  Both (A) and (B)

  ঘ

  Either (A) and (B)

  ঙ

  None of the above
• Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
  ক

  The system is relatively stable

  খ

  The system is highly stable

  গ

  The system is highly oscillatory

  ঘ

  None of the above
• Directly converts temperature into voltage.
  ক

  Thermocouple

  খ

  Potentiometer

  গ

  Gear train

  ঘ

  LVDT

  ঙ

  None of the above
• The phase lag produced by transportation relays
  ক

  Is independent of frequency

  খ

  Is inversely proportional to frequency

  গ

  Increases linearly with frequency

  ঘ

  Decreases linearly with frequency
• Which of the following is exhibited by Root locus diagrams ?
  ক

  The poles of the transfer function for a set of parameter values

  খ

  The bandwidth of the system

  গ

  The response of a system to a step input

  ঘ

  The frequency response of a system

  ঙ

  None of the above
• Which of the following devices is used for conversion of co-ordinates ?
  ক

  Microsyn

  খ

  Selsyn

  গ

  Synchro-resolver

  ঘ

  Synchro-transformer
• From which of the following transfer function can be obtained ?
  ক

  Signal flow graph

  খ

  Analogous table

  গ

  Output-input ratio

  ঘ

  Standard block system

  ঙ

  None of the above
• Mass, in force-voltage analogy, is analogous to
  ক

  charge

  খ

  current

  গ

  inductance

  ঘ

  resistance
• The viscous friction co-efficient, in force-voltage analogy, is analogous to
  ক

  charge

  খ

  resistance

  গ

  reciprocal of inductance

  ঘ

  reciprocal of conductance

  ঙ

  none of the above
• technique is not applicable to nonlinear system ?
  ক

  Nyquist Criterion

  খ

  Quasi linearization

  গ

  Functional analysis

  ঘ

  Phase-plane representation
• An amplidyne can give which of the following characteristics ?
  ক

  Constant current

  খ

  Constant voltage

  গ

  Constant current as well as constant voltage

  ঘ

  Constant current, constant voltage and constant power

  ঙ

  None of the above
• has tendency to oscillate.
  ক

  Open loop system

  খ

  Closed loop system

  গ

  Both (A) and (B)

  ঘ

  Neither (A) nor (B)
• Which of the following is the definition of proportional band of a controller ?
  ক

  The range of air output as measured variable varies from maximum to minimum

  খ

  The range of measured variables from set value

  গ

  The range of measured variables through which the air output changes from maximum to minimum

  ঘ

  Any of the above

  ঙ

  None of the above
• Signal will become zero when the feedback signal and reference signs are equal.
  ক

  Input

  খ

  Actuating

  গ

  Feedback

  ঘ

  Reference
• Is not a final control element.
  ক

  Control valve

  খ

  Potentiometer

  গ

  Electropneumatic converter

  ঘ

  Servomotor
• By which of the following the system response can be tested better ?
  ক

  Ramp input signal

  খ

  Sinusoidal input signal

  গ

  Unit impulse input signal

  ঘ

  Exponentially decaying signal
• Is an open loop control system.
  ক

  Ward Leonard control

  খ

  Field controlled D.C. motor

  গ

  Stroboscope

  ঘ

  Metadyne
• An automatic toaster is a ______ loop control system.
  ক

  open

  খ

  closed

  গ

  partially closed

  ঘ

  any of the above