11. The voltage level at which the comparator is saturated by a differential input equal to greater than a specified voltage is called
A. Zero output level
B. Positive output level
C. Negative output level
D. All of the mentioned
12. When the logic level of strobe output is at zero, then the output current is called
A. Strobe terminal current
B. Strobe current
C. Strobe threshold current
D. Strobe’s bias current
13. The strobe release time is defined as
A. Time required for output to rise to logic threshold
B. Time required for input to rise to logic threshold
C. Time required for output to rise to zero logic
D. Time required for output to rise to one logic
14. Which of the following comparator can operate from ±15 to down to +5v supply in op-amp?
A. µA741
B. µA311
C. µA351
D. All of the mentioned
15. Find the comparator that has a slow response time
A. LM1414
B. µF311
C. ICL8001
D. None of the mentioned
16. Why ICL8001 op-amp comparator is preferred for most applications?
A. Low power consumption
B. High response time
C. High input current
D. Balanced input offset voltage
17. Which op-amp is preferred for applications like high-speed A-D converter and zero-crossing detector.
A. ICL8001
B. LM1414
C. µA311
D. µA670
18. What is Barkhausen criterion for oscillation?
A. Aß > 1
B. Aß < 1
C. Aß = 1
D. Aß ≠ 1
19. At what condition the output signal can be continuously obtained from the input signal?
A. When the product of input voltage and the feedback voltage is equal to 1
B. When the product of amplifier gain and transfer ratio is equal to 1
C. When the product of feedback voltage and transfer ratio is equal to 1
D. When the product of amplifier gain and the input voltage is equal to 1
20. An oscillator is a type of
A. Feedforward amplifier
B. Feedback amplifier
C. Waveform amplifier
D. RC amplifier
21. What is the condition to achieve oscillations?
A. |Aß|=1
B. ∠Aß=0o
C. ∠Aß=multiples of 2π
D. All the mentioned
22. What happens if |Aß|<1
A. Oscillation will die down
B. Oscillation will keep on increasing
C. Oscillation remains constant
D. Oscillation fluctuates