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ECE control system 1 apr

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BIRSA INSTITUTE OF TECHNOLOGY (TRUST)

BITT POLYTECHNIC

1 STASSIGNMENT WITH SILUTION

BRANCH: ECE Semester- 4TH SUB: CONTROL SYSTEM

OBJECTIVE QUESTION

1. ___ is a closed loop system.

(a) Auto-pilot for an aircraft (6) Direct current generator (c) Car starter (d) Electric switch

Ans: a

2. Which of the following devices are

commonly used as error detectors in

instruments?

(a) Vernistats (b) Microsyns (c) Resolvers (d) Any of the above

Ans: d

3. Which of the following should be done

to make an unstable system stable?

(a) The gain of the system should be decreased (b) The gain of the system should be increased (c) The number of poles to the loop transfer function should be increased (d) The number of zeros to the loop transfer function should be increased

Ans: b

4. ___ increases the steady state accuracy.

(a) Integrator (b) Differentiator (c) Phase lead compensator (d) Phase lag compensator

Ans: a

5. A. servomotor resembles

(a) two phase induction motor (b) Three phase induction motor (c) direct current series motor (d) universal motor

(a) reference and output (b) reference and input (e) input and feedback signal (d) output and feedback signal

Ans: a

9. ___ is an open loop control system.

(a) Ward Leonard control (b) Field controlled D. motor (c) Stroboscope (d) Metadyne

Ans: b

10. A control system with excessive noise,

is likely to suffer from

(a) saturation in amplifying stages (b) loss of gain (c) vibrations (d) oscillations

Ans: a

11. Zero initial condition for a system

means

(a) input reference signal is zero (b) zero stored energy (c) ne initial movement of moving parts (d) system is at rest and no energy is stored in any of its components

Ans: d

12. Transfer function of a system is used

to calculate which of the following?

(a) The order of the system (b) The time constant (c) The output for any given input (d) The steady state gain

Ans: c

13. The band width, in a feedback

amplifier.

(a) remains unaffected (b) decreases by the same amount as the gain increase (c) increases by the sane saaaajajt as the gain decrease (d) decreases by the same amount as the gain decrease

Ans: c

What are the basic elements used for modeling mechanical translational system. Mass, spring and dashpot.
What are the basic elements used for modeling mechanicalrotational system? Moment of inertia J, dashpot with rotational frictional coefficient B and torsional spring with stiffness K.
Write the force balance equation of an ideal mass element. F = M d2 x/dt
Write the force balance equation of ideal dashpot element. F = B dx/dt

LONG QUESTION

1 Explain block diagram with its

basic element?

Block diagram can be a single block or a combination of blocksthat represents a control system in pictorial form.

A simple block diagram featuring two blocks, summing and takeoff points.

Advantages of block diagram:

It is easy to represent even a complicated control system in block diagram.

The flow of signals and function of each blocks can be easily understood.

Advantages of block diagram reduction technique :

It is easy to reduce the block diagram and derive the overall transfer function by following reduction rules.

Limitations:

It takes more time to reduce a big system as the reduced diagram has to be drawn at each step.

Explain Types of Control systems

Ans-

Types of Control systems:

Control systems are of two types are

Open Loop System
Closed Loop System 1)Open loop control system:

Any physical system which does not automatically correct the variation in its output is called an open loop system or control system in which the output quantity has no effect upon the input quantity are called open loop control system .This means that the output is not feedback to the input for correction.

In open loop control system, the output can be varied by varying the input due to external disturbances, the system output may change the output

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