Electrical Control Systems

This is an MCQ-based quiz on Electrical Control Systems.

This includes a Computer control system, Digital data system, Stochastic control system, and Adaptive control system.

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A control system working under unknown random actions is called

Computer control system Digital data system Stochastic control system Adaptive control system

As a result of introduction of negative feedback which of the following will not decrease?

Band width Overall gain Distortion Instability

In a control system the output of the controller is given to

Final control element Amplifier Comparator Sensor

A signal other than the reference input that tends to affect the value of controlled variable is known as

Disturbance Command Control element Reference input

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

For open control system which of the following statements is incorrect?

Less expensive Recalibration is not required for maintaining the required quality of the output Construction is simple and maintenance easy Errors are caused by disturbances

Regenerative feedback implies feedback with

Oscillations Step input Negative sign Positive sign

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

_________ directly converts temperature into voltage.

Thermocouple Potentiometer Gear train LVDT

Which of the following is the nonlinearity caused by servomotor?

Static friction Backlash Saturation None of the above

In a stable control system backlash can cause which of the following?

Under-damping Over-damping Poor stability at reduced values of open loop gain Low-level oscillations

The transient response of a system is mainly due to

Inertia forces Internal forces Stored energy Friction

The frequency and time domain are related through which of the following?

Laplace Transform and Fourier Integral Laplace Transform Fourier Integral Either (B) or (C)

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 nonlinearities causes malfunctioning Less expensive Generally free from problems of nonlinearities

Which of the following is the output of a thermocouple?

Alternating current Direct current A.C. voltage D.C. voltage

________ can be extended to systems which are time-varying?

Bode-Nyquist stability methods Transfer functions Root locus design State model representatives

In order to increase the damping of a badly under-damped system which of following compensators may be used?

Phase-lead Phase-lag Both (A) and (B) Either (A) and (B)

Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal.

Acceleration Velocity Position All of the above

From which of the following transfer function can be obtained?

Signal flow graph Analogous table Output-input ratio Standard block system

________ increases the steady state accuracy.

Integrator