The expected answers were:
                        (a)                                 

                         
                         (b)       (i)         average value = 0.637 x peak value                                                   
                                                                       = 0.637 x 4 x 103 = 2.55 kV                                       
                                    (ii)        r.m.s. value = 0.707 x peak value                                                       

                                                                    = 0.707 x 4 x 103 = 2.83 kV      

The question was on Alternating Current Circuit Theory. Many candidates who attempted this question performed very well.  The performance was reported good.