16. If two pumps identical in all respects and each capable of delivering a discharge Q against a
head H are connected in series, the resulting discharge is :

(ಡಿ) 2Q against a head 2H (B) 2Q against a head H
(0) Q against a head 2H (D) Q against a head नि.

17. The power obtained from an impulse turbine is proportional to the number of nozzles used.
A pelton turbine with six nozzles has a specific speed of 8.1. The specific speed per nozzle is -

ക 188 | (31-12
‏جک‎ യ 8.1
18. During idling of a petrol engine requires :
(ಡಿ) chemically correct mixture (B) variable mixture
(0 168/0 mixture (D) rich mixture

19. Ininvestment casting the pattern :
(ಗಿ) 1877866 ೧ wax
(3) is made of plastic
(C) 18 always made of the material to be cast
(D) is not used

20. In the Orsat apparatus KOH solution is used to absorb :
(ಗಿ) carbon monoxide (ए) carbon dioxide
(C) oxygen (D) none of the above

21. For the same compression ratio :
(ക) thermal efficiency of otto cycle is greater than that of diesel cycle
(B) thermal efficiency of otto cycle is less than that of diesel cycle
(C) thermal efficiency of otto cycle is same as that for a diesel cycle
(D) thermal efficiency of diesel cycle cannot be predicted

22. The knocking in SI engine gets reduced :
(A) Dby increasing the compression ratio
(B) by retarding the spark advance
(C) by increasing the inlet air temperature
(D) by increasing the cooling water temperature

23. Where is the Hook’s joint used in an automobile?
(ಗಿ) between gearbox and propeller shaft
(8) between flywheel and clutch
(C) between differential gear and wheel
(D) 0601662 clutch and gear box

A 5 147/2015
[P.T.0.]