Three types of emergencies are: 

1.Emergency of war: When emergency is declared as a result of war or external aggression ,its called emergency provision.

2.Emergency of subversion: When emergency is declared due to internal disturbance whithin the state to suppress civil war or any anti government movement or to face any natuaral disaster,it is called emergency of subversion.

3.Emergency of economic: When emergency is declared with a view to overcoming a situation in which the economy if the state is about the breakdown or has broken down,it is called economy emergency.