Heating elements of electrical heaters are made of
A.Nichrome
B.Nicheloy
C.Invar
D.Tungsten
E.Phosphor bronze
A.Nichrome
B.Nicheloy
C.Invar
D.Tungsten
E.Phosphor bronze
A.Martensite
B.Troosite
C.Pearlite
D.Sorbite
A.Hardness
B.Hardness and tensile strength
C.Brittleness
D.Brittleness and toughness
E.None of the above
A.0.01%
B.0.10%
C.0.80%
D.1.10%
E.2.10%
A.Magnesium
B.Alpha iron
C.Titanium
D.Zinc
E.Cadmium
A.Air, water, oil, fused salt
B.Water, air, fused salt, oil
C.Oil, fused salt, air, water
D.Water, oil, fused alst, air
A.Brass
B.Copper
C.Lead
D.Steel
E.Titanium
A.Cementite
B.Flakes
C.Powder
D.Spheroids
E.None of the above
A.Thermopile
B.Bolometer
C.Thennocouple
D.thermo-generator
E.Thermo-galvanometer
A.Are very tough
B.Are less tough
C.Do not have tendency to distort
D.Are denser
E.Are lighter