Module 4 (B1) Module 4 (B1) quiz contains 20 question based on the syllabus for module 4 examination for B1 category. The time limit for the quiz is 25 min. The number of attempts allowed are unlimited. All the best. Name 1. In a transient velocity feedback circuit, the tachogenerator output is summated with the demand voltage at all times when the load is moving only when the load is speeding up or slowing down only when the load is slowing down None 2. One characteristic of the emitter follower is low current amplification low resistance output high voltage amplification None 3. A thyristor has which of the following High resistance when switched off High resistance when switched on A positive temperature coefficient None 4. Why is a diode put in parallel with an LED ? So it will work only above a certain voltage So it will work only below a certain voltage To protect it from AC None 5. PIN diodes are used mainly for fast switching devices linear rectifiers voltage operated rectifiers None 6. To reduce oscillations about a demand position the amount of velocity feedback would be decreased the amount of position feedback would be increased the amount of velocity feedback would be increased None 7. A silicon diode, when compared to a germanium diode has less forward bias voltage the same forward bias voltage a higher forward bias voltage None 8. The common collector amplifier is sometimes called the emitter follower circuit because the emitter current follows the collector current the emitter voltage follows the collector voltage the emitter voltage follows the base voltage None 9. A servo system that overshoots and oscillates is under damped critically damped over damped None 10. The result of cross connecting two of the transmission leads in a torque synchro system and then turning the rotor of the transmitter 60° clockwise would be the receiver would move 120° anticlockwise the receiver would move 60° anticlockwise the receiver would move 60° clockwise None 11. In the circuit diagram shown, R1 and R2 are used to set the transistor gain increase the base voltage set the DC bias level None 12. In an LED, what is used to make the colour The electrons The doping material The plastic lens cover None 13. What diode gives off light photons when forward biased Schottky diode LED Gunn diode None 14. To convert a differential synchro from subtraction to addition you would change over all three stator windings reverse the reference phase supply change over two rotor and two stator connections None 15. In a speed control servo system (rate control), the purpose of the tachogenerator is to make it run at constant speed to make the deflection proportional to servo demand to make the velocity proportional to servo demand None 16. The voltage supply to a Complimentary Metal Oxide Semiconductor (CMOS) integrated circuit must be 3V to 15V AC 3V to 18V DC 0 V is 5 V DC None 17. In a resolver synchro the stator windings are electrically displaced by 180° 90° 120° None 18. In an NPN transistor the P is the collector base emitter None 19. Critical damping in a servomechanism is the critical damping required for the optimum damping of the servomechanism the amount of damping that results in the load just not oscillating the point which allows just one overshoot before the load comes to rest None 20. A typical use for resolver synchros is in compass comparator units engine power instrumentation fly by wire system None 1 out of 1