Multiple Choice Questions Question 1. 1. (TCO 1) The controlled variable in a cl

Question

Multiple Choice Questions

Question 1.1. (TCO 1) The controlled variable in a closed-loop system is the direction of a robot arm. Initially, it is at 50o; then it is commanded to go to 25o.  What is the error when the arm position is at 15o? (Points : 8)       15o
      25o
      10o
      50o

Question 2.2. (TCO 1) A motor was measured to rotate (unloaded) at 5000 rpm, with a 6-V input and 1000 rpm, with a 1.2-V input. What is the transfer function (steady state) for the unloaded motor in rpm/V? (Points : 8)       8.33
      83.3
      833
      63.3

Question 3.3. (TCO 1) In a certain system, an electrical heating element was found to increase the temperature of a piece of metal 5o for each amp of current. The metal expands 0.003 in./deg, and pushes on a load sensor that outputs 1 V/0.004 in. of compression. What is the overall transfer function in V/amp. (Points : 8)       3.75
      6.33
      833
      63.3

Question 4.4. (TCO 1) Which of the following is a closed-loop system? (Points : 8)       Turning on the lights in a house at 6 p.m., and turning them off at 6 a.m.
      Turning off the heater when the temperature reaches 68o or above.
      Pumping water out of the ground.
      Setting the alarm to 8 a.m.

Question 5.5. (TCO 1) If the gain in decibels of an amplifier is 76.9, what is the straight gain? (Points : 8)       6998
      6578
      6745
      6853

Question 6.6. (TCO 2) Find the current in a ground loop that is 180 m long, has a wire resistance of 0.07 ohms/m, and has a difference of 4 V between grounds?(Points : 8)       0.5189
      0.3234
      0.3175
      0.5609

Explanation / Answer

(1)10o

(2)83.3

(3)6.33

(4)Turning off the heater when the temperature reaches 68o or above.

(5)6578

(6)0.3175

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