In a superconductor the value of critical density depends upon
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ECE · all questionsMaterials And Components
Materials And Components
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In scintillation coating applications, shields of which material are generally placed around the photomultiplier tube to overcome interference effects of electrons deflected from their normal path?
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In a variable type carbon resistor the carbon track is formed of a mixture of a carbon, resin and
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Consider the following statement : Extrinsic semiconductors show high electrical conductivity because the impurities are
1. of high conductivity
2. highly mobile
3. highly charged
Which of these statements are NOT correct?
1. of high conductivity
2. highly mobile
3. highly charged
Which of these statements are NOT correct?
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Match List-I with List-II and select the correct answer using the options given below:
| List-I | List-II |
| a. Hexagonal crystal | 1. a = b = c; γ = α = β ≠ 90º |
| b. Rhombohedral crystal | 2. a = b ≠ c; α = β = 90º; γ = 120º |
| c. Triclinic crystal | 3. a ≠ b ≠ c; α = β ≠ γ ≠ 90º |
| d. Monoclinic crystal | 4. a ≠ b ≠ c; α ≠ γ ≠ 90º ≠ β |
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A resistance thermometer has a temperature coefficient of resistance 10-3 per degree and its resistance at 0°C is 1.0 Ω. At what temperature is its resistance 1.1 Ω?
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Ceramic insulators undergo a glazing process to reduce the possibility of electric breakdown. What is the effect of this process?
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Piezoelectric materials serve as a source of
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The materials having permanent electric moment are called
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The Electrical susceptibility and relative permittivity are related as:
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Which of the following properties is not correct for a superconductor in its superconducting stage?
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Which one of the following statements is not correct regarding the features of ceramics?
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Ferromagnetic property may be explained on the basis of
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For an insulating material, dielectric strength and dielectric loss should be respectively
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Susceptibility of a diamagnetic material is
1. Negative
2. Positive
3. Dependent of the temperature
4. Independent of temperature
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1. Negative
2. Positive
3. Dependent of the temperature
4. Independent of temperature
Select the correct answer using the options given below:
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If the temperature of a semiconductor material is increases, the number of free electrons
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The minimum cation-to-anion radius ratio for the coordination number 3 is
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Which one of the following is the correct statement? The orientational polorizability in a polyatomic gas is proportional to-
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Ferromagnetic materials are those which
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Q100
Open questionConsider the following statements regarding electrical properties of ceramic materials:
1. They are practically non-conductors at lower temperatures.
2. Ordinary glass and silicates in molten state are dependable as electrical non-conductors.
3. They offer high resistance to current transmission and get heated soon when conducting electric current.
Which of the above statements are correct?
1. They are practically non-conductors at lower temperatures.
2. Ordinary glass and silicates in molten state are dependable as electrical non-conductors.
3. They offer high resistance to current transmission and get heated soon when conducting electric current.
Which of the above statements are correct?
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