Q1 - Lamp should glow when start switch is made ON. Lamp should go OFF after 15 second automatically. Lamp should go OFF immediately when start switch SI is made OFF. Lamp should go OFF immediately also when reset switch S2 is made. ON even before the expiry of 15 sec time.
Q2) - When a push button is pressed and released the lamp should glow and gets OFF automatically after 25 second. If before the expiring of 25 second if a reset switch is made ON the lamp goes OFF immediately.
Q3) The lamp should glow after a delay of 15 second when start switch s1 is made ON. The lamp should remain in glowing condition till the start switch s1 is made ON. The lamp should go immediately OFF when start switch s1 is made OFF.
Q4) Lamp should glow after a delay of 25 second when start switch S1 is made ON and should remain ON in glowing condition even the switch is made OFF. Lamp should go OFF immediately when a reset switch is S2 is made ON.
Q5) A timer is to run a fan 8.6 sec after a wall switch is made ON. If the wall switch is turn OFF during the 8.6sec time interval, the time is reset to zero sec, so that when the wall switch is again turned ON, the delay is full 8.6sec.