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1) Can you give some examples of JQuery AJAX functions ?
$.get() - load data from the server using a HTTP GET request
$.post() - load data from the server using a HTTP POST request
$.ajax() - perform an asynchronous HTTP (Ajax) request
All these functions and methods use XMLHttpRequest under the hood.

2) Write code to create a promise object using JQuery ?
You can create a promise object by using the $.Deferred method.
There are a number of methods available on this Deferred object

resolve - 
resolvewith - passes data to the promises object subscribers 
notify - 
notifywith - passes data to the promises object subscribers 
reject - 
rejectwith - passes data to the promises object subscribers 
promise - 

There are a number of methods available on the Promise object

done - 
fail - 
always - 
pipe - 
progress - 
state - 
then - 

function timeoutAsync(milliseconds) { 
    var deferred = $.Deferred(); 
    setTimeout(function () { deferred.resolve(); }, milliseconds);  // run this code when the time has expired 
    return deferred.promise();  // changes the state of the promise object to resolved 
}; 
function abcAsync() { 
    var promise = timeoutAsync(2000); 
    promise.done(function () { alert('done!') });  
    return promise;   // you should always return a promise 
};