11. What happens when the frequency increases?

A. A_{OL}(f) continues to drop

B. A increases

C. f_{o} –> 0Hz

D. None of the mentioned

12. What will be the absolute value of phase shift, if the frequency keeps increasing?

A. Increase towards 45^{o}

B. Decrease towards 45^{o}

C. Increase towards 90^{o}

D. Decrease towards 90^{o}

13. Which of these statements is false?

A. The open-loop gain A_{OL}(f) dB is approximately constant from 0Hz to f_{o}

B. When input signal frequency and f is equal to break frequency f_{o}, the gain frequency is called -3dB frequency

C. The open-loop gain A_{OL}(f) dB is approximately constant upto break frequency f_{o}, but thereafter it increases 20dB each time there is a tenfold increase in frequency.

D. At unity gain crossover frequency, the open-loop gain A_{OL}(f) dB is zero

14. What is the maximum phase shift that can occur in an op-amp with a single capacitor?

A. 180^{o}

B. 60^{o}

C. 270^{o}

D. 90^{o}

15. How can the gain roll-off be represented in dB/octave?

A. 12 dB/octave

B. 6 dB/octave

C. 10 dB/octave

D. 8 dB/octave

16. Select the correct magnitude and phase for the frequency range.

List-I | List-II |

1. f1 | i. Gain is 3dB down from the value of A_{OL} in dB |

2. f=f_{1} |
ii. Gain roll-off at the rate of 20 dB/decade |

3. f>>f_{1} |
iii. Magnitude of the gain is 20logxA_{OL} in dB |

A. 1-iii, 2-i, 3-ii

B. 1-I, 2-ii, 3-iii

C. 1-iii, 2-ii, 3-i

D. 1-ii, 2-iii, 3-i

17. The specific frequency at which A_{OL} (dB. is called

A. Gain bandwidth product

B. Closed-loop bandwidth

C. Small signal bandwidth

D. All of the mentioned

18. Find out the expression for open loop gain magnitude with three break frequency?

A. A/[1+ j(f/f_{o1})]x[1+ j(f/f_{o2})]x[1+ j(f/f_{o3})].

B. A/[1+ j(f/f_{o})]^{3}

C. A/A/[1+ j(f/f_{o1})]+ [1+ j(f/f_{o2})]+ [1+ j(f/f_{o3})].

D. All of the mentioned

19. Find out the frequencies that are avoided in the frequency response plot?

A. None of the mentioned

B. Single break frequency

C. Upper break frequency

D. Lower break frequency

20. In a phase response curve of MC1556, the phase shift is -162.5^{o} about 4MHz. If the approximate value of the first break frequency is 5.5Hz. Determine the approximate value of the second break frequency?

A. 945.89MHz

B. 945.89kHz

C. 945.89GHz

D. 945.89Hz

21. Consider a practical op-amp having two break frequencies due to a number of RC pole pairs. Determine the gain equation using the given specifications:

A ≅ 102.92dB; f_{o1} =6Hz ; f_{o2} =2.34MHz .

A. 140000/[1+ j(f/6)]x[1+ j(f/2.34)].

B. 140000/[1+ j(f/6)]x[1+ j(f/234)].

C. 140000/[1+ j(f/6)]x[1+ j(f/23400)].

D. 140000/[1+ j(f/6)]x[1+ j(f/2340000)].

22. What is the voltage transfer function of the op-amp in the s-domain.

A. S×A/(s+ω_{o})

B. A/(s+ω_{o})

C. (A×ω_{o})/(s+ω_{o})

D. None of the mentioned

23. Calculate the unity-gain bandwidth of an op-amp. Given, A≅ 0.2×10^{6} & f_{o} =5Hz?

A. 10^{6}

B. 10^{8}

C. 10^{-5}

D. 10^{-10}