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Electrical Engineering
Electrical Control Systems
Quiz 2
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Q.1
The temperature, under thermal and electrical system analogy, is considered analogous to
voltage
current
capacitance
charge
none of the above
Q.2
Directly converts temperature into voltage.
Thermocouple
Potentiometer
Gear train
LVDT
None of the above
Q.3
Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
The system is relatively stable
The system is highly stable
The system is highly oscillatory
None of the above
Q.4
In thermal-electrical analogy charge is considered analogous to
heat flow
reciprocal of heat flow
reciprocal of temperature
temperature
none of the above
Q.5
An increase in gain, in most systems, leads to
smaller damping ratio
larger damping ratio
constant damping ratio
none of the above
Q.6
In electrical pneumatic system analogy the current is considered analogous to
velocity
pressure
air flow
air flow rate
Q.7
Which of the following devices are commonly used as error detectors in instruments ?
Vernistats
Microsyns
Resolvers
Any of the above
Q.8
In pneumatic control systems the control valve used as final control element converts
Pressure signal to electric signal
Pressure signal to position change
Electric signal to pressure signal
Position change to pressure signal
Q.9
In case of type-1 system steady state acceleration is
unity
infinity
zero
10
Q.10
The transient response of a system is mainly due to
inertia forces
internal forces
stored energy
friction
Q.11
In liquid level and electrical system analogy, voltage is considered analogous to
head
liquid flow
liquid flow rate
none of the above
Q.12
Which of the following statements is not necessarily correct for open control system ?
Input command is the sole factor responsible for providing the control action
Presence of non-linearities causes malfunctioning
Less expensive
Generally free from problems of non-linearities
Q.13
When the initial conditions of a system are specified to be zero it implies that the system is
At rest without any energy stored in it
Working normally with reference input
Working normally with zero reference input
At rest but stores energy
Q.14
A control system working under unknown random actions is called
Computer control system
Digital data system
Stochastic control system
Adaptive control system
Q.15
Which of the following is the best method for determining the stability and transient response ?
Root locus
Bode plot
Nyquist plot
None of the above
Q.16
The on-off controller is a _____ system.
digital
linear
non-linear
discontinuous
Q.17
In order to increase the damping of a badly underdamped system which of following compensators may be used ?
Phase-lead
Phase-lag
Both (A) and (B)
Either (A) and (B)
None of the above
Q.18
From which of the following transfer function can be obtained ?
Signal flow graph
Analogous table
Output-input ratio
Standard block system
None of the above
Q.19
Which of the following devices is used for conversion of co-ordinates ?
Microsyn
Selsyn
Synchro-resolver
Synchro-transformer
Q.20
A controller, essentially, is a
sensor
clipper
comparator
amplifier
Q.21
Which of the following is an open loop control system ?
Field controlled D.C. motor
Ward leonard control
Metadyne
Stroboscope
Q.22
Which of the following is exhibited by Root locus diagrams ?
The poles of the transfer function for a set of parameter values
The bandwidth of the system
The response of a system to a step input
The frequency response of a system
None of the above
Q.23
In open loop system
the control action depends on the size of the system
the control action depends on system variables
the control action depends on the input signal
the control action is independent of the output
Q.24
The phase lag produced by transportation relays
is independent of frequency
increases linearly with frequency
decreases linearly with frequency
Q.25
In a stable control system saturation can cause which of the following ?
Low-level oscillations
High-level oscillations
Conditional stability
Overdamping
Q.26
Velocity error constant of a system is measured when the input to the system is unit _______ function.
parabolic
ramp
impulse
step
Q.27
The transient response, with feedback system,
rises slowly
rises quickly
decays slowly
decays quickly
Q.28
Transfer function of a system is used to calculate which of the following ?
The order of the system
The time constant
The output for any given input
The steady state gain
Q.29
In a system low friction coefficient facilitates
Reduced velocity lag error
Increased velocity lag error
Increased speed of response
Reduced time constant of the system
Q.30
Increases the steady state accuracy.
Integrator
Differentiator
Phase lead compensator
Phase lag compensator
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