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Quiz 1
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Q.1
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.2
DC tachogenerator can be used in
Speed control system
Position control system
Both A and B
Neither A nor B
Q.3
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.4
Which dc servomotor requires strongest permanent magnet?
Slotted armature
Surface wound armature
Surface wound with stationary rotor
Either A or B
Q.5
Which of the following is used to obtain output position in a position control system?
Strain gauge
Load cell
Synchro
Thermistor
Q.6
Temperature is analogous to
Voltage
Flux
Charge
None of the above
Q.7
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.8
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.9
Which of the following is correct?
Speed torque characteristics of permanent magnet dc servomotor is more flat than that of wound field dc servomotor
Speed torque characteristics of wound field dc servo- motor is more flat than that of per-manent magnet dc servo motor
Speed torque characteristics of wound field and permanent magnet dc servomotor are equally flat
None of the above
Q.10
The distance of poles from origin depends on
Uqndamped natural frequency
Damping ratio
Both A and B
Neither A nor B
Q.11
In force current analogy, displacement x is analogous to
Charge
Magnetic flux linkage
Electrostatic energy
Voltage
Q.12
If the poles lie in second quadrant, damping ratio is
1
less than 1
zero
more than 1
Q.13
Which of the following is open loop system?
Wind screen wiper
Aqualing
Respiratory system of animal
System for controlling antirocket missiles
Q.14
The poles with greater displacement from the real axis correspond to
Higher frequencies of oscillations
Stable response
Lower frequencies of oscillations
Unbounded output
Q.15
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.16
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.17
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.18
If poles lie in first quadrant, damping ratio is
1
More than 1
less than 1
Zero
Q.19
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)
Q.20
In force current analogue, mechanical mobility is analogous to
Impedance Z
Admittance Y
Reactance X
Conductance G
0 h : 0 m : 1 s
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