**Q1. Which of the following is not a general characteristic of ac wave?**

A. The wave shape is identical for each cycle

B. The polarity reverses periodically

**C. The electrons always flow in the same direction**

D. There is a definite frequency

**Q2. All sine waves**

**A. Have similar general appearance**

B. Have instantaneous rise and fall times

C. Are in the same phase as cosine waves

D. Rise instantly, but decay slowly

**Q3. The derivative of a sine wave**

A. Is shifted in phase by ½ cycle from the sine wave

**B. Is the rate of change in the instantaneous value**

C. Has instantaneous rise and decay times

D. Rise instantly, but decays slowly

**Q4. A phase difference of 180deg in the circular motion model of a sine wave represents**

A. ¼ revolution

**B. ½ revolution**

C. A full revolution

D. Two full revolution

**Q5. We can add or subtract a ….degrees of phase to or from a wave, and end up with exactly the same wave again**

A. 90

B. 180

C. 270

D. 360

**Q6. A wave has a frequency of 300kHz. One complete cycle takes…..seconds**

A. 1.3000

B. 0.00333

C. 1/3000

**D. 3.33 X 10-6**

**Q7. A wave has a frequency of 440Hz, how long does it take for 10: of a cycle to occur?**

A. 0.00273s

B. 0.0000273s

**C. 0.0000631s**

D. 0.00000631s

**Q8. One waveform has a peak value of ±3V and the other has peak value of ±5V. These two waves are in phase coincidence. The resultant has voltages of**

**A. ±8Vpk, in phase with the composites**

B. ±2 Vpk, in phase with the composites

C. ±8Vpk, in phase opposition with respect to the composites

D. ±2 Vpk, in phase opposition with respect to the composites

**Q9. Two pure sine waves that differ in phase by 180: can be considered to**

A. Be offset by two full cycles

**B. Be in phase opposition**

C. Be separated by less than ¼ cycle

D. Have a frequency of ½ cycle

**Q10. A BJT has**

A. three PN junctions

**B. three semiconductor layers**

C. two N type layers around a P type layer

D. a low avalanche voltage