30 JUNE 2021 CURRENT AFFAIRS QUIZ

The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.

40

70

85

15

TRUE ANSWER : ?
YOUR ANSWER : ?

Shaft furnaces are used for

Calcining

All of these

Smelting

Roasting

TRUE ANSWER : ?
YOUR ANSWER : ?

Forced recirculation of furnace gases is practised

All of these

In furnaces, operating below 750°C

To increase heat transfer by convection

To ensure uniform temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The heating capacity of muffle furnace depends on the

Both A & B

Neither A nor B

Surface area & emissivity of the stock

Properties of the muffle wall (temperature, area, emissivity)

TRUE ANSWER : ?
YOUR ANSWER : ?

Artificial draught produced by a fan in the furnace can be controlled by the

Variation in the pitch of fan blades

Speed of the fan

All of these

Damper

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a directly fired intermittant furnace?

Tunnel kiln

Tower furnace

Walking beam reheating furnace

Reverberatory furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

40

65

80

20

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ atmosphere is maintained inside an iron blast furnace.

Inert

Decarburising

Reducing

Oxidising

TRUE ANSWER : ?
YOUR ANSWER : ?

The method of Lobo and Evans is concerned with the calculation of the

Heat absorption in radiant section of a furnace

Heat transfer by forced convection in a reboiler

Heat transfer in vacuum condensers

Mass transfer co-efficient

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum heat transfer in high temperature furnaces is by

Convection

Either A, B or C; depends on the type of furnace

Conduction

Radiation

TRUE ANSWER : ?
YOUR ANSWER : ?

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