MODULE - 4 (B1) 1. What gives the colour of an LED? 2. A germanium diode is used for: # a) The plastic it is encased in # b) The active element c) The type of gas used inside it a) rectification b) voltage stabilization c) modulation 3. Why is a diode put in parallel with an LED? # 4. When testing the forward bias of a diode with a multimeter: a) the positive lead of the ohmmeter is placed on the cathode # b) the positive lead of the ohmmeter is placed on the anode c) it does not matter which terminal the positive lead of the ohmmeter is placed 5. In an NPN transistor the P is the: # 6. The output of a tachogenerator is # 7. AC power is supplied to: a) torque receiver only b) torque transmitter only # c) both the torque receiver and torque transmitter 8. How is a PCB protected after manufacture? a) With non-conductive varnish b) With wax c) By conformal coating # 9. A differential synchro: # 10. A semiconductor doped with an element having a valency of 5 will produce : #
11. What gate does the following Boolean expression represent F = A.B.C: # 12. What gate does the following Boolean expression represent F = A+B+C: a) NOT b) NOR c) OR # 13. A resolver has: # 14. The 'null' point on a control synchro is when the two rotors are: #
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- Summer '17
- sajad heidari
- power supply