Answer Happy

h 1. What is the purpose of the control transformer in machine control systems? 2. Why are fuses necessary in control circuits even though the power mains may already have circuit breakers? 3. What is the purpose of the a) shrouded pushbutton actuator, b) flush pushbutton actuator, and the c) extended pushbutton actuator? 4. Draw the electrical symbol for a two- position selector switch with one contact. The switch is named "ICE" and the selector positions are "CUBES" on the left and "CRUSHED" on the right. The contact is to be closed when the switch is in the "CUBES” position. 5. Draw an electrical diagram rung showing a N/O contact CR5 in series with a N/C contact CR11, operating a lamp L3. 6. Draw a ladder diagram that will perform the following operations: a. Energize relay coil CR1 only when ON AND CR11 is OFF. b. Energize relay coil CRI only when (CR10 is ON AND CR11 is ON) OR CR12 is OFF c. Energize relay coil CR1 only when (CR10 is OFF AND CR11 is OFF) OR (CR12 is ON AND CR13 is ON). d. Energize relay coil CR1 only when CR10 and CR11 are both ON OR both OFF e. Energize relay coil CR1 only when either CR10 OR CR11 are ON, but not both. f. De-energize relay coil CRI only when CR10 is ON AND CRIl is OFF (Note: CR1 should be energized under all other conditions). g. Energize relay coil CRI only when any two or more of CR10, CRII, and CR12 are ON. 7. A delay-on (TON) relay has a preser of five seconds. If the coil terminals are energized for eight seconds, how long a V will its contacts be actuated?
а 10. Draw a ladder diagram rung similar to Figure 1-28 that will cause a lamp L5 to illuminate when relay CR1 is ON, CR2 is OFF, and CR3 is OFF. 11. Draw a ladder diagram rung similar to Figure 1-28 that will cause a lamp L7 to be OFFwhen relay CR2 is ON or when