Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B. Tech III CONTROL SYSTEMS ENGINEERING Previous Question Paper (May/June - 2019 - R13)
Part A is compulsory. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Give two examples for open loop and closed loop control systems.
Answer
Examples of open loop control systems include an electric toaster and a hand-operated hair dryer, where the output has no effect on the control action. Examples of closed loop control systems include an automatic air conditioner with a thermostat and a speed-controlled DC motor using a tachometer feedback, where the output is continuously monitored and adjusted to maintain the desired set point.
What are the advantages of block diagram reduction technique?
Answer
The block diagram reduction technique offers several advantages for analyzing complex control systems:
- It provides a simplified visual representation of the entire system, making it easier to identify the relationships between individual components and subsystems.
- It allows for the systematic reduction of complex interconnected systems into a single transfer function, which simplifies the mathematical analysis of system stability and performance.
- It enables the isolation of specific feedback loops, allowing engineers to evaluate the effect of individual components or controllers on the overall system behavior without requiring a full state-space model.
What is mean by steady state error?
Answer
Sign in to view the complete answer paper.
What is damping ratio? Differentiate second order system based on damping ratio.
Answer
Sign in to view the complete answer paper.
Define root locus.
Answer
Sign in to view the complete answer paper.
What are the advantages of R-H criteria?
Answer
Sign in to view the complete answer paper.
What is gain crossover frequency and phase crossover frequency.
Answer
Sign in to view the complete answer paper.
What is nyquist criteria?
Answer
Sign in to view the complete answer paper.
Define controllability.
Answer
Sign in to view the complete answer paper.
Define state, state variable, state vector.
Answer
Sign in to view the complete answer paper.
Part B
Give the classification of control systems in detail.
Answer
Sign in to view the complete answer paper.
For the signal flow graph shown in figure 1, determine the gain X5/X1 using Mason’s gain formula.
Answer
Sign in to view the complete answer paper.
Mention the merits and demerits of an open-loop and closed-loop control systems.
Answer
Sign in to view the complete answer paper.
Find the transfer function of the network given in figure 2.
Answer
Sign in to view the complete answer paper.
Derive the time response of second order over damped system due to unit step input.
Answer
Sign in to view the complete answer paper.
What are generalized error constants? State the advantages of generalized error coefficients?
Answer
Sign in to view the complete answer paper.
What are the time response specifications? Explain and write the expression for each of them.
Answer
Sign in to view the complete answer paper.
Obtain the root locus plot for the system whose open loop transfer function is given. For what range of ‘K’ the system is stable?
Answer
Sign in to view the complete answer paper.
Investigate the stability of a control system whose characteristic equation is given.
Answer
Sign in to view the complete answer paper.
Explain the effect of adding poles and zeros to G(S)H(S) on the root loci.
Answer
Sign in to view the complete answer paper.
Design a lag compensator for unity feedback system whose open loop transfer function is given to satisfy the following specifications: Velocity error constant KV ≥ 50 and Phase margin ≥ 20 degrees.
Answer
Sign in to view the complete answer paper.
Draw and explain polar plots for type-0, type-1 and type-2 systems.
Answer
Sign in to view the complete answer paper.
Explain the procedure for determination of transfer function from Bode plots.
Answer
Sign in to view the complete answer paper.
A system is described by state space equations. Find the transfer function.
Answer
Sign in to view the complete answer paper.
Considering the vector matrix differential equation describe the dynamics of the system. Determine state transition matrix.
Answer
Sign in to view the complete answer paper.
Explain kalman’s test to check controllability and observability.
Answer
Sign in to view the complete answer paper.