We now give you a problem to test your knowledge of this chapter's objectives. Refer to the antenna azimuth position control system shown in Appendix A2, Configuration 2. Find the range of preamplifier gain required to keep the closed-loop system stable. R(s) 3.1831 + 150 0.16 S+150 s(s+1.32) C(s) 3.1831 R(s) 3.1831 K Equivalent diagram 150 0.16 S+150 s(s+1.32) C(s)

11. Why is the conduction angle greater with an inductive load than with a purely resistive load? 12. For a full-wave phase control circuit draw the output voltage and current waveforms when firing angle α = (45-X)° (Here X= 10). Consider the load to be inductive. 13. What point in a single-phase ac waveform is used as a reference point for timing the thyristor gate pulses?

Discuss the advantages and disadvantages of electromechanical energy conversion.

Discuss the importance of power delivery and voltage regulation on a motherboard. How do voltage regulators and capacitors contribute to stable system operation?

Draw a schematic of an FM slope detector and explain its operation. Why is this method 
not often used in practice?

Explain Hartley configuration?

A 4-quadrant DC chopper with bipolar switching operating at a switching frequency of 2kHz, is connected to a 120VDC source (Vs) and a DC motor which has a counter EMF (CEMF) of 50VDC at rated speed. The armature resistance is 2Ω and the armature inductance is 20mH. Calculate:   a) Output voltage with an 80% duty cycle   b) Magnitude and direction of the DC armature current with an 80% duty cycle.     c) Duty cycle for a forward braking current of 10ADC. (Assume the speed has not changed due to the large inertia of the load.)

Using an sma to bnc connector how can you test a pcb and connect it to a signal generator and oscilloscope?