APPSC Ceramic Technology 15 March 2020 Question Paper with Answers Key

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APPSC Ceramic Technology 15 March 2020 Question paper with Answers Key- APPSC conducted Lecturers in Government Polytechnic Colleges (Engineering and Non-Engineering) in A.P Technical Education Service exam on 15 March 2020 FN from 10.00 AM to 12.30 PM. Here we are providing some of the questions asked in APPSC Ceramic Technology Paper.

The enamels are refractory and have a viscous character when they are?

High in feldspar content

The use of must be avoided in any white ground coat?

Tin oxide and Titanium oxide

The enamels are difficult to smelt and fire if the?

Quartz content is high

In case ground coats, borax causes?

Short firing range

Which is used for pickling?

Acid proof Stoneware tank

The neutralizing solutions consists of?

Soda ash

Which oxide may not be present on the iron to be pickled?

FeO

The adhering property is improved by the addition of?

Cobalt oxide

Which is used for making of jewellery enamel frits?

Crucible smelter

The blistering of enamels in the furnance atmosphere may be caused by the presence of?

Water Vapour

APPSC Ceramic Technology 15 March 2020 Paper

The processs of Scaling is closely related to?

Annealing

In ground coats, quartz causes?

Long firing range

The pyrometric cones have a?

Triangular base and defined dimension and size

Theoretically, the MgO Percentage in magnetise is?

47.6

In general, the fireclay refractories contains?

25-45 wt% of alumina

The bulk density of silicon carbide refractories is?

Less than 3.0 g/cc

The operation that promotes adherence is called?

Nickle dips

Silica refractories are those materials that contain SiO2 that is?

Greater than 93%

In de-enameling by the alkalin solution method, the material used is?

Sodium hydroxide

The mill additions for enamels can be classified into …….. groups?

4

Ceramic Technology

APPSC Ceramic Technology 15 March 2020 Questions and answers

Zircon is a silicate of Ziroconium, containing?

67% Zirconia and 33% silica

The specific gravity value of Zirconia refractory is?

6.1

The most common ceramic fiber system are?

Aluminia, Aluminia – Silica and Zirconia

The specific load maintained for the RUL test is?

0.2 MPa

The hydrogen reactions are …….. in nature?

Exothermic

The percentage of gypsum usually interground with clinker is?

5 (Approx)

Which refractory materials shows high RUL value, close to its PCE?

Silica

Which refractories has a wide gap between its RUL and PCE values?

Magnesia

The Oxidation of MgO-C refractory by gaseous components is mainly due to?

Oxygen and carbon dioxide

The lowest temperature of liquid formation for pure fireclay is approximately?

1587 degree C

APPSC Ceramic Technology 15 March 2020 paper with Key

The clinkers are ……….?

5 – 25 diameter nodules

Pure calcite contains…..?

100% calcium carbonates

The argillaceous material in manufacturing of portland cement is?

Clay

The fineness of the cement is determined with the help of the ……… test?

Sieve

The final setting time for Portland cement should be about?

10 hours

The soundness of the cement is the result of?

Free lime

Which applications is not based on ionic conditions?

Thermistor

The soundness of the cement is determined with the help of?

Le chatelier apparatus

The oxide in the least percentage of a typical Portland cement is?

MgO

The grey colour of the ordinary Portland cement is generally due to the presence of?

iron

APPSC Ceramic Technology Answers Key 15 March 2020

Which is not a secomdary fuel?

Coal

Which is not a fossil fuel found in the crust of earth?

Chemical

Rotary Kilns are used for calcinations of?

Limestone and Dolomite

Which materials exhibits the Meissner effect?

Super conductor

Which materials is not a Pyroelectric crystal?

Tanatalum Pentoxide

A super conducting material is a superconducting state is?

Diamagnetic

The spark plug insulators for automobiles are fabricated from?

High alumina

………. Is not application of the ion conducting ceramics?

As sensor

The materials that produce heat by combustion are termed as?

Fuels

The degree of polarisability as a material is identified by the term?

Relative dielectric constant

APPSC Ceramic Technology 15 March 2020 Full Question Paper & Key

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