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Q.1
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.2
The sensor generally used in incremental optical encoder is
LED
LCD
Photodiode
Either (a) or (b)
Q.3
Bandwidth is proportional to speed of response.
True
False
Q.4
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.5
Magnetic amplifier is used for
Voltage amplification
Power amplification
Current amplification
Frequency amplification
Q.6
Which control action can never be used alone?
Proportional
Derivative
Integral
Both (b) and (c)
Q.7
The effect of adding poles and zeros can be determined quickly by
Nichols chart
Nyquist plot
Bode plot
Root locus
Q.8
Which of the following can be used as a rotating amplifier in a control system?
1. Amplidyne
2. Separately excited dc generator
3. Synchro
4. Self excited dc generator
3 and 4
1 and 2
1, 2 and 3
All
Q.9
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.
True
False
Q.10
In the field controlled motor the entire damping comes from
Armature resistance
Back emf
Motor friction and load
Field resistance
Q.11
Nyquist stability criterion uses open loop frequency response characteristics.
True
False
Q.12
A lead compensator
Speeds up the transient response
Increases the stability margin
Increases the stability margin and speeds up the transient-response.
None of the above
Q.13
In control systems the output of sensor usually, is
Analog electrical signal
Digital electrical signal
Mechanical signal
Analog or digital electrical signal
Q.14
In Bode plots the frequency at which two asymptotes meet is called corner frequency.
True
False
Q.15
Integral control action
Removes offset
May lead to oscillatory response
Both (a) and (b)
Neither (a) nor (b)
Q.16
The relative stability of a system is given by
Gain margin alone
Phase margin alone
Both phase and gain margins
Either (a) or (b)
Q.17
Transport lag usually exists in
Thermal systems
Hydraulic systems and thermal systems
Pneumatic systems
Thermal, hydraulic and pneumatic systems
Q.18
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.19
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.
True
False
Q.20
Robotic manipulator arms mostly use
Hydraulic actuator
Pneumatic actuator
Electric motor actuator
None of the above
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