22) Shock resisting steels should have

high hardness

high toughness

high tensile strength

low wear resistance

Answer is:

high toughness

Explanation:

shock resisting steel that offers good ductility and toughness at high hardness levels. It exhibits high strength and adequate abrasion resistance for those applications involving shock or impact loading.

ISRO Technician-B Turner Question Paper - 2019 (Set-1) with Answer Key

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23) The purpose of using flux in soldering is to

Increase fluidity of solder metal

Fill up gaps left in a bad joint

Wash away surplus solder

Prevent oxides forming

Answer is:

Prevent oxides forming

24) The chisel used for cutting key ways is

Flat chisel

Round nose chisel

Cape chisel

Diamond pointed chisel

Answer is:

Cape chisel

25) Spot facing is the operation of

Enlarging the hole

Machining of the wall surface of hole

Flat machining the face surface around the hole

Cutting internal threads

Answer is:

Flat machining the face surface around the hole

Explanation:

Spot facing is a machining operation for producing a flat seat for bolt head, washer or nut at the opening of a drilled hole. The tool is called a spot facer or a spot facing tool.
Spot facing is similar to counter-boring, except that it is shallower. Tools that are used for counter-boring can be used for spot facing as well.