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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