Control Systems N6 — Document
August 2021 — N6 — Control Systems
N6
2021
Nated Engineering
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Q1— Section header —
1.10in the ANSWER BOOK
1.1An arrangement of physical components connected in a circuit to manipulate, regulate, command or direct the system
1.2A function of time that has a value of zero up to time equal to zero, and for any time greater than zero, it has a constant value of one
1.3An undesired input signal which affects the value of the controlled output
1.4The sum of the transient response and the steady state response in a linear constant differential equation
1.5The mathematical equation containing elements of a system to be transferred from the input to the output, assuming all initial conditions to be zero.
1.6A function of time of which the amplitude is zero, where t = a, except wher t = b
1.7The ratio of decibels between the controlled output and the reference input of a system
1.8The frequency produced when two complementary energy storing components of a system produce an oscillation between them
1.9The ratio between the actual amount of damping and the critical amount of damping
1.1010
Q2— Section header —
2.1FIGURE 1(a\shows a first order RC differentiator circuit diagram. FIGURE 1(b\ shows the resulting block diagram for this system. Find the transfer function for this system by using block diagram algebra
2.2Express the given Laplace funct ion in terms of the equivalent ' domain (2\
2.3Express the given Laplace function in terms of the equivalent time function (3\ [10] RC10
Q3— Section header —
3.1Plot a point by point Bode diagram for the following data on the cycle semi
3.2Determine the following from the graph:
3.2.1The phase crossover frequency
3.2.2The gain crossover frequency
3.2.3The frequency at the maximum peak value
3.2.4The phase margin
3.2.510
Q4— Section header —
4.1Use the Nichols chart to determine the following:
4.1.1The gain margin (1\
4.1.2The phase margin (1\
4.1.3The gain crossover frequency (1\
4.1.4The phase crossover frequency (1\
4.1.5The undamped natural resonant frequency (1\
4.1.6The peak frequency response (1\
4.1.7The peak magnitude and phase (2\
4.1.8The closed loop bandwidth (1\
4.2Is the system stable or unstable (1\ [10] 808001610
Q5— Section header —
5.1The closed loop poles (2\
5.2The gain constant ( \t point ' (3\
5.3The damped resonant frequency ( \point ' (1\
5.4The undamped resonant frequency ( \t point ' (1\
5.5(2\
5.6The frequency at which the system becomes unstable (1\ [10]10
Q6— Section header —
6.1State FIVE characteristics of an ideal operational amplifier. (5\
6.2State the function of a photoelectric transducer. (2\
6.3State the function of a tacho generator in control systems. (2\
6.4What do tacho generators measure? (1\ [10]10
Q7— Section header —
7.1State TWO advantages of using rectified alternating current to control direct current motor speed controllers. (2\
7.2Explain the operating principle of an electronic self balancing potentiometer used to control a gun turret. (6\
7.3Name TWO types of photo electric transducers. (2\ [10]10
Q8— Section header —
8.1State SIX advantages of using fluid power. (6\
8.2Explain the operating principle of an external spur gear hydraulic pump. (4\ [10] 808001610
Q9— Section header —
9.1Name the THREE cascade connected control terms of a pneumatic controller. (3\
9.2Define the term integral control action (2\
9.3Name TWO disadvantages of using a proportional pneumatic controller. (2\
9.4Explain the term teady tate with regards to integral control. (3\ [10]10
Q10— Section header —
10.1When using Lissajous figures to compare the phase difference between two sinusoidal signals, the resulting display on the screen of the oscilloscope could take on three forms. Name the THREE forms. (3\
10.2State the function of a pulse generator. (2\
10.3State THREE basic procedures to be followed when executing a system response test. (3\
10.4Name the TWO groups into which analogue meters are classified. (2\ [10] TOTAL: 100 808001610
Mark Allocation
Total100 marks
Sections10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100 marks
Paper information
TitleDocument
SubjectControl Systems
LevelN6
Document typeQuestion paper
Year2021
MonthAugust
Pages14
Downloads4
Examination context
Decade2020s
Years ago5y
SeasonWinter (SH)
Start daySunday
Exam periodAugust 2021
Days since exam1,898
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