Q.1
If the poles lie in second quadrant, damping ratio is
  • 1
  • less than 1
  • zero
  • more than 1
Q.2
Magnetic amplifier is used for
  • Voltage amplification
  • Power amplification
  • Current amplification
  • Frequency amplification
Q.3
Nichols chart consists of
  • Constant magnitude loci
  • Constant phase angle loci
  • Magnitude and phase angle loci in log-magnitude versus phase diagram
  • None of the above
Q.4
In force current analogue, mechanical mobility is analogous to
  • Impedance Z
  • Admittance Y
  • Reactance X
  • Conductance G
Q.5
The sensor generally used in incremental optical encoder is
  • LED
  • LCD
  • Photodiode
  • Either (a) or (b)
Q.6
The poles with greater displacement from the real axis correspond to
  • Higher frequencies of oscillations
  • Stable response
  • Lower frequencies of oscillations
  • Unbounded output
Q.7
In a two phasor servomotor, the direction of rotation of the rotating field depends on
  • Magnitudes of voltages applied to the two stator windings
  • Phase relation of voltages applied to the two stator windings
  • Both magnitude and phase relationship of voltages applied to the two stator windings
  • None of the above
Q.8
A system is highly oscillatory if
  • Gain margin is high
  • Gain margin is close to 1
  • Gain margin is close to 1 or phase margin is zero
  • Gain margin is high and phase margin is 180°
Q.9
M circles are symmetrical with respect to
  • Real and imaginary axis
  • M = 1 straight line and real axis
  • M = 1 straight line and imaginary axis
  • M = 1 straight line
Q.10
In control systems the output of sensor usually, is
  • Analog electrical signal
  • Digital electrical signal
  • Mechanical signal
  • Analog or digital electrical signal
Q.11
Which of the following can be used as a rotating amplifier in a control system?AmplidyneSeparately excited dc generatorSynchroSelf excited dc generator
  • 3 and 4
  • 1 and 2
  • 1, 2 and 3
  • All
Q.12
The effect of adding poles and zeros can be determined quickly by
  • Nichols chart
  • Nyquist plot
  • Bode plot
  • Root locus
Q.13
For type 1 system the velocity lag error is
  • Inversely proportional to bandwidth of system
  • Directly proportional to gain constant
  • Inversely proportional to gain constant
  • Independent of gain constant
Q.14
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.
  • True
  • False
Q.15
In the field controlled motor the entire damping comes from
  • Armature resistance
  • Back emf
  • Motor friction and load
  • Field resistance
Q.16
Integral control action
  • Removes offset
  • May lead to oscillatory response
  • Both (a) and (b)
  • Neither (a) nor (b)
Q.17
Nichol’s chart is symmetric about –axis.
  • True
  • False
Q.18
Robotic manipulator arms mostly use
  • Hydraulic actuator
  • Pneumatic actuator
  • Electric motor actuator
  • None of the above
Q.19
Transport lag usually exists in
  • Thermal systems
  • Hydraulic systems and thermal systems
  • Pneumatic systems
  • Thermal, hydraulic and pneumatic systems
Q.20
The relative stability of a system is given by
  • Gain margin alone
  • Phase margin alone
  • Both phase and gain margins
  • Either (a) or (b)
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