Question: Addition of copper to aluminium results in_____________________?

• 1. improvement of casting characteristics
• 2. improvement of corrosion resistance
• 3. one of the best known age and precipitation-hardening systems
• 4. improving machinability

Question: Which of the following alloys does not contain tin_________________?

• 1. white metal
• 2. solder admiralty
• 3. fusible metal
• 4. phosphor bronze

Question: Delta metal is an alloy of__________________?

• 1. copper, zinc and iron
• 2. iron, nickel and copper
• 3. iron, lead and tin
• 4. iron, aluminium and magnesium

Question: Phosphor bronze contains____________________?

• 1. 0.5% of phosphorous
• 2. 1% phosphorous
• 3. 2.5% phosphorous
• 4. none of the above

Question: DuraJomin contains___________________?

• 1. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
• 2. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg
• 3. 10% aluminium and 90% copper
• 4. 90% magnesium and 9% aluminium with some copper

Question: Monel metal contains_________________?

• 1. 63 to 67% nickel and 30% copper
• 2. 88% copper and 10% tin and rest zinc
• 3. alloy of tin, lead and cadmium
• 4. malleable iron and zinc

Question: Perminvar alloy having constant permeability is an alloy of________________?

• 1. nickel, copper and iron
• 2. nickel, copper and zinc
• 3. copper, nickel and antimony
• 4. iron, zinc and bismuth

Question: Muntz metal contains copper and zinc in the ratio of________________?

• 1. 50 : 50
• 2. 40 : 60
• 3. 60 : 40
• 4. 20 : 80

Question: Aluminium bronze contains aluminium and copper in the ratio of___________________?

• 1. 50 : 50
• 2. 40 : 60
• 3. 60 : 40
• 4. 10 : 90

Question: The correct sequence for descending order of machinability is _____________________?

• 1. grey cast iron, low carbon steel, wrought iron
• 2. low carbon steel, grey cast iron, wrought iron
• 3. wrought iron,low carbon steel, grey cast iron
• 4. wrought iron, grey cast iron, low carbon steel