Related Questions

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
A 768
B 1127
C 1359
D 1480
In heating the ferromagnetic material by induction heating, heat is produced due to
A Induced current flow through the charge
B Hysteresis loss taking place below Curie temperature
C Due to hysteresis loss as well as eddy current loss taking place in the charge
D None of the above factors
A magnetic material becomes __________ above the Curie temperature.
A Ferromagnetic
B Diamagnetic
C Paramagnetic
D None of these
Which of the following properties is found only in ferromagnetic materials ?
A Susceptibility independent of temperature
B Point in a particular direction
C Hysteresis
D Attracting a magnetic substance
Spontaneous magnetisation is characteristic of ferromagnetic materials.
A True
B False
Heating wet steam at constant temperature is heating it at constant
A Volume
B Pressure
C Entropy
D Enthalpy
In resistance heating highest working temperature is obtained from heating elements made of
A Nickel copper
B Nichrome
C Silicon carbide
D Silver
Curie point is the temperature at which
A Matter becomes radioactive
B A metal loses magnetic properties.
C A metal loses conductivity
D Transmutation of metal occurs.
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
A 770°C
B 910°C
C 1050°C
D Below recrystallization temperature
Ferromagnetic alpha iron exists in temperature range of
A Below 723°C
B 770 to 910°C
C 910 to 1440°C
D 1400 to 1539°C

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