Millwright Red Seal Exam Practice Questions – Industrial Mechanic Study & Review
BRITTLENESS - ✔✔IS THE PROPERTY OF A METAL WHICH PERMITS NO PERMANENT
DISTORTION BEFORE BREAKING.
DUCTILITY - ✔✔: IS THE ABILITY OF THE METAL TO BE PERMANENTLY DEFORMED WITHOUT
BREAKING. METALS
SUCH AS MACHINE ( MILD ) STEEL, WHICH MAY BE DRAWN INTO WIRE IS A DUCTILE MATERIAL.
ELASTICITY - ✔✔: IS THE ABILITY OF A METAL TO RETURN TO ITS ORIGINAL SHAPE AFTER ANY
FORCE, ACTING
UPON IT, HAS BEEN REMOVED. PROPERLY HEAT-TREATED SPRINGS ARE GOOD EXAMPLES OF
ELASTIC
MATERIALS.
HARDNESS: - ✔✔: MAY BE DEFINED AS THE RESISTENCE TO FORCEABLE PENETRATION OR
PLASTIC DEFORMATION.
MALLEABILTY: - ✔✔IS THAT PROPERTY OF A METAL, WHICH PERMITS IT TO BE HAMMERED OR
ROLLED INTO OTHER
SIZES AND SHAPES.
TENSILE STRENGTH: - ✔✔IS THE MAXIMUM AMOUNT OF PULL THAT A MATERIAL WILL
WITHSTAND BEFORE
BREAKING. IT IS EXPRESSED AS THE NUMBER OF POUNDS PER SQUARE INCH OF PULL THAT IS
REQUIRED TO
BREAK A BAR HAVING A CROSS SECTION OF ONE SQUARE INCH
TOUGHNES: - ✔✔IS THE PROPERTY OF A METAL TO WITHSTAND IMPACT OR SHOCK.
, ANNEALING -ANNEALING CONSISTS OF HEATING STEEL TO ABOVE ITS CRITICAL RANGE AND
THEN ALLOWING IT TO COOL SLOWLY.
NORMALIZING - ✔✔: IT CONSISTS OF HEATING SOMEWHAT ABOVE CRITICAL THE RANGE,
FOLLOWED BY AIR-COOLING.
HARDENING: - ✔✔IS ACOMPLISHED BY HEATING THE STEEL BEYOND THE CRITICAL
TEMPERATURE AND FOLLOWING BY RELATIVELY FAST COOLING. IF HEATING FOR HARDENING IS
BEING ACCOMPLISHED IN THE FORGE FIRE THE COLOR SHOULD BE A FULL RED AND TO CHECK
ON THE TEMPERATURE A MAGNET MAY BE USED, AS THE STEEL AT OR ABOVE THE CRITICAL
TEMPERATURE SHOULD BE NON-MAGNETIC. IF THE MAGNET IS BEING USED WHILE THE
TEMPERATURE IS BEING RAISED FROM THE ROOM TEMPERATURE, THE CORRECT POINT TO
STOP HEATING IS WHERE THE STEEL NO LONGER RESPONDS TO THE PULL OF THE MAGNET. IF A
FURNACE IS BEING USED TO HEAT THE STEEL TO THE HARDENING HEAT A PYROMETER AIDS
GREATLY IN DETERMINING THE CRITICAL TEMPERATURE.
TEMPERING: - ✔✔TEMPERING IS THE APPLICATION OF HEAT AFTER HARDENING. THE
PURPOSE IS TO RELIEVE SOME OFTHE HARDENING STRAINS AND ALSO TO SOFTEN THE STEEL.
TEMPERING IS ACCOMPLISHED BY HEATING TO
SOME PREDETERMINED TEMPERATURE AND FOLLOWED BY ANY RATE OF COOLING.
. WHAT IS MEANT BY A PLAIN CARBON STEEL - ✔✔.---STEEL WHICH CONTAINS ONLY CARBON
AND NO OTHER MAJOR ALLOY ELEMENT
WHAT IS MEANT BY AN ALLOY STEEL - ✔✔.---A CARBON STEEL TO WHICH ONE OR MORE
ELEMENTS ARE ADDED
DEFINE HEAT TREATMENT - ✔✔.---THE HEATING AND COOLING OF STEEL TO GIVE IT SPECIFIC
DESIRABLE QUALITIES
MAGANESE IS BOTH ESSENTIAL AND A RESPECTED ELEMENT IN STEEL AND IS SOMETIMES
BRITTLENESS - ✔✔IS THE PROPERTY OF A METAL WHICH PERMITS NO PERMANENT
DISTORTION BEFORE BREAKING.
DUCTILITY - ✔✔: IS THE ABILITY OF THE METAL TO BE PERMANENTLY DEFORMED WITHOUT
BREAKING. METALS
SUCH AS MACHINE ( MILD ) STEEL, WHICH MAY BE DRAWN INTO WIRE IS A DUCTILE MATERIAL.
ELASTICITY - ✔✔: IS THE ABILITY OF A METAL TO RETURN TO ITS ORIGINAL SHAPE AFTER ANY
FORCE, ACTING
UPON IT, HAS BEEN REMOVED. PROPERLY HEAT-TREATED SPRINGS ARE GOOD EXAMPLES OF
ELASTIC
MATERIALS.
HARDNESS: - ✔✔: MAY BE DEFINED AS THE RESISTENCE TO FORCEABLE PENETRATION OR
PLASTIC DEFORMATION.
MALLEABILTY: - ✔✔IS THAT PROPERTY OF A METAL, WHICH PERMITS IT TO BE HAMMERED OR
ROLLED INTO OTHER
SIZES AND SHAPES.
TENSILE STRENGTH: - ✔✔IS THE MAXIMUM AMOUNT OF PULL THAT A MATERIAL WILL
WITHSTAND BEFORE
BREAKING. IT IS EXPRESSED AS THE NUMBER OF POUNDS PER SQUARE INCH OF PULL THAT IS
REQUIRED TO
BREAK A BAR HAVING A CROSS SECTION OF ONE SQUARE INCH
TOUGHNES: - ✔✔IS THE PROPERTY OF A METAL TO WITHSTAND IMPACT OR SHOCK.
, ANNEALING -ANNEALING CONSISTS OF HEATING STEEL TO ABOVE ITS CRITICAL RANGE AND
THEN ALLOWING IT TO COOL SLOWLY.
NORMALIZING - ✔✔: IT CONSISTS OF HEATING SOMEWHAT ABOVE CRITICAL THE RANGE,
FOLLOWED BY AIR-COOLING.
HARDENING: - ✔✔IS ACOMPLISHED BY HEATING THE STEEL BEYOND THE CRITICAL
TEMPERATURE AND FOLLOWING BY RELATIVELY FAST COOLING. IF HEATING FOR HARDENING IS
BEING ACCOMPLISHED IN THE FORGE FIRE THE COLOR SHOULD BE A FULL RED AND TO CHECK
ON THE TEMPERATURE A MAGNET MAY BE USED, AS THE STEEL AT OR ABOVE THE CRITICAL
TEMPERATURE SHOULD BE NON-MAGNETIC. IF THE MAGNET IS BEING USED WHILE THE
TEMPERATURE IS BEING RAISED FROM THE ROOM TEMPERATURE, THE CORRECT POINT TO
STOP HEATING IS WHERE THE STEEL NO LONGER RESPONDS TO THE PULL OF THE MAGNET. IF A
FURNACE IS BEING USED TO HEAT THE STEEL TO THE HARDENING HEAT A PYROMETER AIDS
GREATLY IN DETERMINING THE CRITICAL TEMPERATURE.
TEMPERING: - ✔✔TEMPERING IS THE APPLICATION OF HEAT AFTER HARDENING. THE
PURPOSE IS TO RELIEVE SOME OFTHE HARDENING STRAINS AND ALSO TO SOFTEN THE STEEL.
TEMPERING IS ACCOMPLISHED BY HEATING TO
SOME PREDETERMINED TEMPERATURE AND FOLLOWED BY ANY RATE OF COOLING.
. WHAT IS MEANT BY A PLAIN CARBON STEEL - ✔✔.---STEEL WHICH CONTAINS ONLY CARBON
AND NO OTHER MAJOR ALLOY ELEMENT
WHAT IS MEANT BY AN ALLOY STEEL - ✔✔.---A CARBON STEEL TO WHICH ONE OR MORE
ELEMENTS ARE ADDED
DEFINE HEAT TREATMENT - ✔✔.---THE HEATING AND COOLING OF STEEL TO GIVE IT SPECIFIC
DESIRABLE QUALITIES
MAGANESE IS BOTH ESSENTIAL AND A RESPECTED ELEMENT IN STEEL AND IS SOMETIMES
