ECET402 Quiz 1

Question 1.

Question :

(TCO 1) The controlled variable in a closed-loop system is the direction of a robot arm.  Initially, it is at 10^o; then it is commanded to go to 35^o.  What is the set point?

Question 2.

Question :

(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?

Question 3.

Question :

(TCO 1) In a certain system, an electrical heating element was found to increase the temperature of a piece of metal 10^o for each amp of current. The metal expands 0.001 in./deg, and pushes on a load sensor that outputs 1 V/0.005 in. of compression. What is the overall transfer function inV/amp.

Question 4.

Question :

(TCO 1) Which of the following is a open-loop system?

Question 5.

Question :

(TCO 1) Find the gain in decibels of an amplifier that has a straight gain of 7000?

Question 6.

Question :

(TCO 2) Find the current in a ground loop that is 200 m long, has a wire resistance of 0.06 ohms/m, and has a difference of 4 V between grounds?

Question1.

Question :

(TCO 2) Why would you use an optical isolator if you are connecting a microprocessor to a motor?

Question 2.

Question :

(TCO 2) Describe two ways to get the time when using position sensors to extract velocity information?

Question 3.

Question :

(TCO 2) How does a bimetallic temperature sensor work?

Question 4.

Question :

(TCO 1) Give an example of (1) a time-driven control system, (2) an event-driven control system, and (3) a combined time-and event-driven control system?