1. A Closed loop system is basically different from open loop control system due to:
a) Feedback
b) Servomechanism
c) Actuating signal
d) Error Signal
2. Introduction of the feedback reduces the effects of:
a) Noise signal
b) Disturbances
c) Error signals
d) Error and noise signals
e) Noise signals and disturbances
3. A control system in which control action depends on the output is called the __ control system
a) Open loop
b) Closed loop
c) Stable
d) Unstable
4. In a control system the use of negative feedback:
a) Eliminates the chances of instability
b) Increases the reliability
c) Reduces the effects of disturbance and noise signals in the forward path
d) Increases the influence of variations of component parameters on the system performance
5. A controller essentially is a:
a) Comparator
b) Sensor
c) Amplfier
d) Clipper
6. In a control system, the controller output is given to:
a) Sensor
b) Comparator
c) Amplifier
d) Final Control element
7. The deviation of the primary feedback signal from the reference input is called the:
a) Actuating signal
b) Error signal
c) Command
d) Manipulated variable
8. The transient response of a system is mainly due to:
a) Friction
b) Inertia forces
c) Stored energy
d) Internal forces
9. Regenerative feedback:
a) Implies feedback with positive sign
b) Is sometimes used to increase the loop gain of the feedback system
c) Has the transfer function with a negative sign in the denominator
d) All the above
10. In a hybrid feedback control systems carrier signals are:
a) ac only
b) dc only
c) both ac and dc
d) none of the above
