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Q.1
Nichol’s chart is symmetric about – 180° axis.
True
False
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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