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Q1— Section header —
1.1A thermocouple probe is the first choice for many applications.
1.1.1
1.1.2Give TWO applications in which thermocouples are used (2\
1.2The operational amplifier is used in signal conditioning processes to eliminate any changes that may occur due to an undesired event or a programmed change on the related motion control application. Determine the best form of multivibrator control when applied to a conveyor belt
1.3The thyristor provides a convenient method of converting AC voltage to a variable DC voltage for controlling the speed of a DC motor.
1.3.1Briefly explain the operation of the circuit that uses a thyristor to control the speed of a DC motor (3\
1.3.2Draw an electronic control circuit that uses SIX thyristors to control the speed of a DC motor. (7\
1.4Explain how a diode is used to protect a transistor. (2\ [20] QUESTION20
2.1
2.2Electromagnets consist of a core of magnetic material surrounded by a coil through which electric current is passed to magneti e the core.
2.2.1
2.2.2
2.3FIGURE 1 below shows a diagram for a two relay reversal circuit. FIGURE 1 Explain how you would control the direction of a motor using a relay. (5\
2.4A stepper motor is a brushless DC electric motor that divides a full rotation into several equal steps. Briefly explain the operation of the stepper motor. (4\ [20]20
Q3— Section header —
3.1Explain what is meant by the term hydrodynamics (2\
3.2Briefly explain why a non positive displacement pump is not used in hydraulic applications. (2\
3.3
3.4
3.5FIGURE 2 below shows a dump truck with a dumping bed coupled to a hydraulic double acting cylinder. FIGURE 2 Design the hydraulic circuit for the dumping system using the following components:
Q4— Section header —
4.1Explain the term proportional control (4\
4.2Electro hydraulic systems use oil under pressure from a hydraulic power pack as hydraulic energy in mechatronics applications. That hydraulic energy is then converted to kinetic energy by means of hydraulic cylinders or hydraulic motors
4.3FIGURE 3 below represents an electro hydraulic oscillating system. Design the electrical circuit diagram for this system and clearly show all safety switches, voltage supply and start/stop buttons. FIGURE 3
Q5— Section header —
5.1Electro hydraulic machine malfunctions may be caused by underlying issues related to FLOW, PRESSURE or DIRECTION.
5.1.1Slow actuator speed
5.1.2
5.2
5.3Hydraulic systems depend on correct flow and pressure of the hydraulic fluid from the power pack pump. he measurement of flow and pressure are the two important means of troubleshooting a hydraulic system
5.3.1List THREE faults that may cause the hydraulic fluid to overheat continually. (3\
5.3.2State THREE causes of excessive noise in the hydraulic pump. (3\
5.4Explain what must be checked before assembling an accumulator. (4\
5.5An ammeter is an instrument that is used to measure current in mechatronics applications. Draw a simple circuit diagram to show how an ammeter is connected in a simple circuit. (4\ [20] TOTAL: 10020