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Which of the following would be in a closed-loop system, but not in an open-loop

ID: 1811228 • Letter: W

Question

Which of the following would be in a closed-loop system, but not in an open-loop system?

a. sensor

b. switch

c. controller

d. actuator


In a closed-loop system, the controller directs the actuator to move in such a way as the error to?

a. a minimum

b. zero

c. the set point

d. the tolerance


Find the current in a ground loop that is 250 m long, has a wire resisteance of 0.04 ohms/m, and has difference of 5 V between grounds?

a. 0.5

b. 0.578

c 0.673

d 0.558


Find the straight voltage gain of an amplifier that has a gain of 35 db.

a. 56.2

b. 57.8

c. 67.3

d. 58.5



Explanation / Answer

1) Which of the following would be in a closed-loop system, but not in an open-loop system?


c. controller


2) In a closed-loop system, the controller directs the actuator to move in such a way as the error to?

  

a. minimum



3) Find the current in a ground loop that is 250 m long, has a wire resisteance of 0.04 ohms/m, and has difference of 5 V between grounds?


R = total resistance = 250*0.04 =10


current = 5/R = 0.5 A

a. 0.5


4) Find the straight voltage gain of an amplifier that has a gain of 35 db.


35 = 20log(gain)

hence gain = 10^(1.75)   =56.2


a. 56.2


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