What is the nature of the coefficient of resistance of an insulator ?
A. Infinite
B. Zero
C. Negative
D. Positive
Electrical Engineering Materials
Electrical Engineering Materials Mcqs
The insulating capacity of material against high voltages is known as:
A. Electromechanical effect
B. Electrochemical effect
C. Dielectric strength
D. Thermoelectricity
Which of the following processes is not an application of thermoelectric effect ?
A. Thomson effect
B. Ettingshausen effect
C. Seebeck effect
D. Peltier effect
What is the electrical resistivity of Copper ?
A. 2.65 * 10-8
B. 5.9 * 10-8
C. 1.59 * 10-8
D. 1.68 * 10-8
What is the electrical conductivity of Aluminum ?
A. 3.5 * 107
B. 1 * 107
C. 6.3 * 107
D. 5.9 * 107
Superconductors are currently utilized in
A. Generating electrostatic field
B. Generating regions free from magnetic field
C. Generating very strong magnetic field
D. Manufacture of bubble memories
The kinetic energy of a bounded electron is ____ ?
A. Infinite
B. Less than that of unbounded electron
C. Greater than that of unbounded electron
D. Equal to that of unbounded electron
Piezoelectric materials serve as a source of:
A. Musical waves
B. Microwaves
C. Ultrasonic waves
D. Resonant waves
Which of the following factors affects the materials resistivity ?
A. Length of the conductor
B. Resistance of the conductor
C. Area of the conductor section
D. All of them
Almost the entire mass of an atom is concentrated in the ____ ?
A. electrons
B. neutrons
C. nucleus
D. protons