Q.1
Nichol’s chart is symmetric about – 180° axis.
Q.2
If poles lie in first quadrant, damping ratio is
  • 1
  • More than 1
  • less than 1
  • Zero
Q.3
Bandwidth is proportional to speed of response.
  • True
  • False
Q.4
Which control action can never be used alone?
  • Proportional
  • Derivative
  • Integral
  • Both (b) and (c)
Q.5
Which of the following is open loop system?
  • Wind screen wiper
  • Aqualing
  • Respiratory system of animal
  • System for controlling antirocket missiles
Q.6
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.
  • True
  • False
Q.7
In Bode plots the frequency at which two asymptotes meet is called corner frequency.
  • True
  • False
Q.8
Nyquist stability criterion uses open loop frequency response characteristics.
  • True
  • False
Q.9
In force current analogy, displacement x is analogous to
  • Charge
  • Magnetic flux linkage
  • Electrostatic energy
  • Voltage
Q.10
If any term in the first column of a Routh array becomes zero, then
  • 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
Q.11
DC tachogenerator can be used in
  • Speed control system
  • Position control system
  • Both A and B
  • Neither A nor B
Q.12
Which dc servomotor requires strongest permanent magnet?
  • Slotted armature
  • Surface wound armature
  • Surface wound with stationary rotor
  • Either A or B
Q.13
Which of the following is used to obtain output position in a position control system?
  • Strain gauge
  • Load cell
  • Synchro
  • Thermistor
Q.14
Temperature is analogous to
  • Voltage
  • Flux
  • Charge
  • None of the above
Q.15
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
  • The gain is increased beyond upper critical value
  • The gain is decreased below lower critical value
  • Both A and B
  • None of the above
Q.16
The addition of a pole to the open loop transfer function pulls the root locus
  • To the right
  • To the left and making the system more stable
  • Towards right or left depending on the position of new pole
  • None of the above
Q.17
For any transfer function, the constant phase angle loci are
  • A family of circles
  • A family of straight lines
  • Either (a) or (b)
  • Neither (a) nor (b)
Q.18
The permanent magnet field system of brushless dc servo- motor is generally on
  • Stator
  • Rotor
  • Partly on stator and partly on rotor
  • Either (a) or (b)
Q.19
The distance of poles from origin depends on
  • Uqndamped natural frequency
  • Damping ratio
  • Both A and B
  • Neither A nor B
Q.20
In a simple on-off controller with differential gap, the magnitude of differential gap determines
  • The level of accuracy
  • The life of controller
  • Both (a) and (b)
  • Neither (a) nor (b)
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