# Iron Making Questions and Answers – Charging of Solid Materials from Top

This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Charging of Solid Materials from Top”.

1. What is the major factor leading to the top charging system?
a) Leakage of gases
b) Temperature control
c) Uniform size distribution
d) Easy burden flow

Explanation: To prevent the top gas leakage and utilization, top charging system plays an important role. This top charging systems are been using since modernization of BF. This top gas is utilized as fuel in many preheating purposes.

2. Two bell charging system consists of _______
a) One small bell and one large bell
b) Two small bells
c) Two large bells
d) Three large bells

Explanation: Two bell charging systems are now days involved in all furnaces charging systems. This is a top charging system. It consists of a small bell upon a largebell followed.

3. Which step of the two bell charging system makes combination of opened large bell and closed small bell?
a) Step-1
b) Step-2
c) Step-3
d) Step-4

Explanation: After step-2, step-3 follows in which small bell is closed and largebell is opened . In twobell charging system charging is comprised in 4 steps .In step 3, to prevent the gas escape into atmosphere the small bell is closed and large bell is opened.

4. Which step of the two bells charging system makes combination of closed large bell and opened small bell?
a) Step-1
b) Step-2
c) Step-3
d) Step-4

Explanation: After step-1, step-2 follows in which small bell is opened and largebell is closed. In twobell charging system is a top charging system .In step2, to admit charge to large bell hopper.

5. Which step of the two bell charging system makes combination of closed large bell and small bell?
a) Step-1 and Step-2
b) Step-2 and Step-3
c) Step-2 and Step-1
d) Step-1 and Step-4

Explanation: Step-1 and Step-4 are the only steps in which both small bell and largebell are closed .In two bell charging system these bells are simultaneously closed and opened in order to control the charging .In these steps both the bells are closed in order to permit movement of skip and to repeat charging cycle.

6. Which of the following implication improves the uniformity of charge distribution in horizontal section in two bell charging system?
a) Revolving chute
b) Skip
c) Small bell
d) Large bell

Explanation: Material is introduced onto the small bell through two openings. These openings each are equipped with a seal valve. Revolving chute distributes the materials evenly on small bell.

7. Which type of charging system comprises of movable deflector?
a) Two bell charging system
b) Four bell charging system
c) Bell type with movable throat armour charging system
d) Bottom charging system

Explanation: Bell type with movable throat armour charging system consists of a movable detector. In this system movable charging system is introduced into the stream of material falling from big bell. Control of cross section is observed in this type of charging system.

8. Which of the following system is followed in Modern furnaces?
a) Two bell charging system
b) Four bell charging system
c) Bell type with movable throat armour charging system
d) Bell less charging system

Explanation: Bell less charging system is the modern system invented by Paul Wurth in 1972. This new system comprises a hopper and a gate. The material is fed onto a rotating chute at variable angles.

9. Exit gas pressure in modern furnaces is above _________
a) 1.5-2.0 atm gauge
b) 1.2-3.0 atm gauge
c) 1.9-2.5 atm gauge
d) 1.8-2.0 atm gauge

Explanation: The exit gas pressure in modern furnaces is above 1.5-2.0 atm gauges. All modern furnaces incorporate high top pressure operations. This leads to more leakage as well as eruption.

10. Heat flow in different zones is measured by________
a) Heat flux
b) Profile meters
c) Thermocouples
d) Infrared probes

Explanation: Heat flux monitoring equipment is one of the best features incorporated in furnaces. These instruments measure heat flow in different zones. These zones involve both above and under the burden zones.

Sanfoundry Global Education & Learning Series – Iron Making.

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