The following item consist of two statements, one labeled as ‘Assertion A’ and
the other labeled as ‘Reason R’. You are to examine these two statements carefully and decide
if the Assertion A and the Reason R are individually true and if so, whether the Reason is a
correct explanation of the Assertion. Select your answers to these items using the codes
given below and mark your answer sheet accordingly.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Assertion (A) : Efficiency of a single – stage impulse turbine increases with increase in
nozzle angle.
Reason (R) : Nozzle angle generally used in a impulse turbine is in the range 16 - , too
low an angle may cause increased energy loss at the blade inlet.