Materials And Components MCQ Questions & Answers | ECE

Superconducting materials are used in which of the following application?
1. Magnetic Resonance Imaging (MRI).
2. Magnetic Resonance Spectroscopy (MRS).
3. High-speed switching and signal transmission for computers.
4. High-speed magnetically levitated trains.
Select the correct answer using the options given below:

Consider the following statements for superconductivity:
1. Superconducting magnets capable of generating high fields with low power consumption are currently being employed in scientific test and research equipment.
2. One of the potential applications of superconducting materials is electrical power transmission through superconducting materials- power losses would be extremely low, and the equipment would operate at low voltage levels.
3. Type II superconductors are preferred over type I for most practical applications by virtue of their higher critical temperatures and critical magnetic fields.
Which of the above statements is/are correct?

Hall effect may be used for which of the following?

Consider the following statements regarding ceramic resonator circuits:
1. The specify larger load capacitance values than crystal circuits
2. They draw still more current than crystal circuit using the same amplifier
Which of the above statements is/are correct?

If a material contains 10²⁰ molecules/m³, each molecule having a moment of 8.854 × 10^-27 C-m parallel to an electric field of 10⁵/m, then its dielectric constant is

Which of the following pairs of crystal structure possesses the same atomic packing density?

Super conductivity can be destroyed by

The electrical conductivity of a semiconductor increases with increase in temperature because

As temperature falls below the transition temperature, the value of critical magnetic field of superconductor

Which of the following statements are correct for superconductors?
1. A substance loses its electrical resistance below certain temperature.
2. Superconducting elements have greater electrical resistivity at room temperature.
3. On adding impurities to super conducting elements its transition temperature is increased.