Call. 800 526-93 Click. www.Motio E0 L the input signal applied to a differentia

Question

Call. 800 526-93 Click. www.Motio E0 L the input signal applied to a differentiator op amp is large but unchanged, its output signal is A. zero. B. one. C. small. D. large 17. The longer the time that an offset error exists, the larger the output of theamp becomes. A. proportional B. integrator C. derivative D. differentiator 18. The only time the cascaded input affects the output of a TTL7485 digital magnitude comparator is when the A. two low-order numbers are equal. B. low-order A input is greater than the low-order B input. C. two high-order numbers are equal. D. low-order A input is less than the low-order B input 19. In a control circuit, a diac triggers alan A. SCR. B. UJT C. controller. D. triac. 20. Which of the following conditions cause steady-state error? A. A load that's too small B. A low gain setting of the proportional operational amplifier C. Infrequent disturbances D. A high gain setting of the proportional operational amplifier

Explanation / Answer

16. Ans A ,

Reason: even though input magnitude is large, input is not changing. So in diffentiation of constant is zero. In diffentiator circuit the input will be applied to one of the capacitor terminal . As input not changed capacitor will facts as open circuit.

17 ans ) B

REASON : If offcet exisist that will be a constant addition to the signal, when we integrate a signal with offcet. Offcet also integrated and added to the signal. So output will be added with t times of the offcet to the actual integration of the signal

18. Ans C)

19ans C ) trigger circuits are used basically to fire thyristors at required time instants. So wth help of triggers we can control the instant of triggering so it is a control circuit.

20ans b . A low gain setting causes high steady state error. Even though only proportional controller can not eliminate steady state error completely. But increase in proportional gain can reduce steady state earror

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