Which is not a hearth furnace ? A. Glass tank furnace B. Open hearth furnaceC. Cupola D. Reheating furnace

Turn down ratio of a burner____________________? A. Should be as low as possible i.e., 1 : 2 B. Should be 1:1 for a batch type furnaceC. Is the ratio of maximum to minimum permissible heat input rates D. Is normally…

Main gas valve in a gaseous fuel burner is a ______________ valve? A. Gate B. Butterfly C. Globe D. None of these

Pulverised fuel fired furnaces employ ______________ fuel firing? A. Horizontal B. Vertical C. TangentialD. All A., B. and C.

Which of the following is a periodic furnace ? A. Tunnel kiln B. Rotary kilnC. Soaking pit D. Reheating furnace

Furnace aerodynamics is related to the _____________ in the furnace? A. Movement of gases B. Measurement of flue gas volume C. Temperature control D. Pressure adjustment

The heating capacity of muffle furnace depends on the_________________? A. Surface area & emissivity of the stock B. Properties of the muffle wall (temperature, area, and emissivity)C. Both A. & B. D. Neither A. nor B.

The heating capacity of muffle furnace depends on the____________________? A. Surface area & emissivity of the stock B. Properties of the muffle wall (temperature, area, and emissivity)C. Both A. & B. D. Neither A. nor B.

In salt bath furnace, heat is transferred to the charge mainly by __________________? A. Conduction B. Convection C. Radiation D. None of these

An example of shaft furnace is the__________________? A. L.D. converter B. Glass melting tankC. Blast furnace D. Soaking pit