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Q1— Section header —
1.1Name the TWO main elements in a transient circuit that can undergo changes as a result of disturbances. (2\
1.2Various options are given as possible answers to the questions below Choose the answer and write only the le tter (A D\ next to the question number (1.2.1
1.2.4
1.2.1The time const ant for the simple circuit 4 s 0,
1.2.2When the capacitor has charged to 85% of the applied voltage, the capacitor voltage would then be 1K7 V
1.2.3
1.2.4The energy stored in the capacitor when it is fully charged will be 0, 0002 J
Q2— Section header —
Q3— Section header —
3.1Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only True or False
3.1.5\ the ANSWER BOOK.
3.1.1Ultrasonic cleaning is a process that does not use a cleaning fluid.
3.1.2During ultrasonic cleaning re depositing of dirt particles on the surface of the material being cleaned is not possible
3.1.3During ultrasonic cleaning the surface tension must be high to ensure easier cavitation.
3.1.4During ultrasonic machining the work piece is immersed in a suspension of abrasive powder and water.
3.1.5
3.2State the function of the DC bias in the basic circuit of an ultrasonic application (3\
3.3Name the TWO main groups in to which the piezo electric effect is divided (2\
Q4— Section header —
4.1upply voltage (3\
4.2Shortest wavelength produced (3\
4.3Frequency of radiation (3\
4.4Power dissipated by tube (5\ [14]14
Q5— Section header —
5.1A 3 way inspection system is also known as a high go low system. Describe the output results represented by
5.1.1High
5.1.2Go
5.1.3
5.2tudy the diagram below and answer the questions
5.2.1Give the full name of the inspection method represented by the circuit diagram above. (1\ 808018
5.2.2Identify the indicated parts by writing the answer next to the letter (A D\ in the ANSWER BOOK. (4\
5.2.3Give ONE disadvantage of this inspection method. (1\ [9]9
Q6— Section header —
6.1Name the THREE steps to determine intrinsic safety and briefly describe each (6\
6.2Name the THREE components of which an optical relay should consist (3\
6.3State ONE purpose of fitting electronic safety devices in industry. (1\ [10]10
Q7— Section header —
7.1Name the FOUR pre requisites for CAM system operation. (4\
7.2Give TH REE types of damping techniques and their associated controller gains. (6\ [10]10
Q8— Section header —
8.1A single phase half controlled bridge converter supplies a certain load. The nput AC voltage is 230 V and the load resistance is 10 while the trigger angle is at 30
8.1.1verage output voltage (4\
8.1.2verage current (3\
8.2Draw a neat, labelled circuit diagram o f a rectifier circuit that use commutating diode. (4\
Q8— Section header —
Q9— Section header —
9.1Ident ify the symbols used in parts 1, 2, 3, 8 and 9. (5\
9.2How many rungs are represented in the ladder diagram (1\
9.3tate the TWO groups of combinations t point 3 which is necessary for it to be ON. (4\
9.4tate the TWO conditions t point 8 which is necessary for it to be OFF. (3\ [13] TOTAL13