7. Draw the ladder rungs to represent the following: (a) two switches that are NO and either of the switches have to be closed for a lamp (b) to operate; (c) both NO switches have to be closed for a coil to be energized in order for a solenoid to operate; (d) a control valve in switched ON by pressing a spring return pushbutton start switch and it remains actuated until another spring return pushbutton stop switch is pressed; (e) a motor is to come ON if there is not input from thermostate switch; (f) stop a motor from running when a pushbutton is pressed. The input field device is a closed pushbutton. 15