50. A heat engine utilises the
A.Calorific value of oil
B.Low heat value of oil
C.High heat value of oil
D.Mean heat value of oil

---

51. Gaseous-fuel guarantees are based on
A.Calorific value of oil
B.Low heat value of oil
C.High heat value of oil
D.Mean heat value of oil

---

52. Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads
A.The friction is high
B.The friction is unpredictable
C.The small difference in cooling water temperature or in internal friction has a disproportionate effect
D.The engine is rarely operated

---

53. Polymerisation is a chemical process in which molecules of a compound become
A.Larger
B.Slowed down
C.Smaller
D.Liquid

---

54. The term scavenging is generally associated with
A.2-stroke cycle engines
B.High efficiency engines
C.Aeroplane engines
D.Diesel engines

---

55. In diesel engine, the compression ratio in comparison to expansion ratio is
A.Same
B.Less
C.More
D.Variable

---

56. The cam shaft of a four stroke LC. engine. running at 1500 rmp will run at
A.1500 rpm
B.750 rpm
C.3000 rpm
D.Any value independent of engine speed

---