Maximum combustion temperature in gas turbines is of the order of 1100 to 10°c whereas same is around 00°c in i.c. Engine ? Why ?

1058

---

Proximity analysis of coal provides data for a first, general assessment of a coal’s quality and type. What elements it reports ?

1047

---

How much resistance is offered to heat flow by drop wise condensation ?

1147

---

Horse power of i.c. Engines can be expressed as rac rating, sae rating, or din rating. To which countries these standards belong ?

1277

---

How is ceramic defined ?

1091

---

Why thermal efficiency of i.c. Engines is more than that of gas turbine plant ?

994

---

What is the difference between isotropic and anisotropic materials ?

1077

---

The graphite in grey irons exists in the form of flakes which act as stress-raisers under tensile loading and consequently grey irons have relatively low tensile strength and ductility. Still grey iron is extensively used in engineering. Why ?

998

---

What are two essential conditions of perfect gas ?

1059

---

Why efficiency of gas turbines is lower compared to i.c. Engines ?

1046

---

For conduction of heat, the instantaneous rate of heat flow is product of three factors. What are these ?

904

---

Ultimate analysis of coal is elementary analysis. What it is concerned with ?

1124

---

Under what circumstances would there be an increase in pressure in a diver¬gent nozzle ?

1021

---

What are orthotropic materials ?

1085

---

Under what condition a convergent divergent nozzle required ?

995

---