1. Main or subassembly line conveyors use sequence control.
a. True
b. False
2. The input section of control consists of contactors, starters, solenoids, power magnetic amplifiers, electronic and solid
state contactors.
a. True
b. False
3. An AND gate must have all inputs in a high state before it develops a high output.
a. True
b. False
4. The INVERTER is a single-input, single output device.
a. True
b. False
5. A NOR gate will have a high input if any input is high.
a. True
b. False
Name: Class: Date:
Unit 22 Sequence Control
6. Sequence control is required whenever the ____ must be operating before the machine itself can be operated safely.
a. upstream equipment
b. equipment connected in parallel with a machine
c. auxiliary equipment associated with a machine
d. downstream equipment
7. The functions of electrical control systems and their associated devices can be grouped into three functions: input,
____, output.
a. information b. reaction
c. logic d. action
8. Input accessories receive and transmit information to the logic section of the control, such as a relay or ____.
a. amplifier b. transistor
c. contactor d. starter
9. Solid-state control logic elements convert a single input into a single output by controlling a ____.
a. transistor b. contactor
c. solenoid d. starter
10. The logic of an OR gate is that ____.
a. if any input is low, the output also will be low
b. if any input is low, the output will be high
c. any high input will produce a high output
d. if either but not both of its inputs is high it will have a high output
Name: Class: Date:
Unit 22 Sequence Control