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Quiz 4
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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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