A 2-stroke oil engine has bore of 20 cm, stroke 30 cm, speed 350 r.p.m, i.m.e.p. 275 kN/m2, net brake load 610 N, diameter of brake drum 1 m, oil consumption 4.25 kg/hr, calorific value of fuel 44 × 103 kJ/kg. The indicated thermal efficiency will be

A 2-stroke oil engine has bore of 20 cm, stroke 30 cm, speed 350 r.p.m

1.	A 2-stroke oil engine has bore of 20 cm, stroke 30 cm, speed 350 r.p.m, i.m.e.p. 275 kN/m2, net brake load 610 N, diameter of brake drum 1 m, oil consumption 4.25 kg/hr, calorific value of fuel 44 × 103 kJ/kg. The indicated thermal efficiency will be
A.	29.1%
B.	31.3%
C.	33.5%
D.	35.7%
Answer» B. 31.3%