Related Questions

The materials which become polarized on the application of mechanical stress are called piezoelectric.
A True
B False
Piezoelectric materials serve as a source of ________ .
A Resonant waves
B Musical waves
C Microwaves
D Ultrasonic waves
Piezoelectric quartz crystal resonators find application where
A Signal amplification is required
B Rectification of the signal is required
C Signal frequency control is required
D Modulation of signal is required
The piezoelectric effect in a crystal is ___________
A A voltage developed because of mechanical stress
B A change in resistance because of temperature
C A change in frequency because of temperature
D None of the above
The instruction state that Sumi may need 4/9 square yards of one type of material and 2/3 square yards of another type of material for a project. She buys exactly that amount. After finishing the project, however, she has 8/18 square yards left that she did not use. What is the total amount of square yards of material Sumi used?
A 1/12
B 1/9
C 2/3
D 10/9
An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is
A Stainless steel
B Cast iron
C Wood
D Teflon
Sobuj bought three pieces of material. The first piece is 1 yard 2 feet 6 inches long, the second piece is 2 yards 1 feet 5 inches long, and the third piece is 4 yards 2 feet 7 inches long. If the cost of the material is Tk. 36 per yard, how much did Sobuj spent?
A Tk. 324
B Tk. 342
C Tk. 350
D Tk. 330
The price of raw meterials had gone up by 15% labor cost has also increased from 25% of the cost of ras material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?
A 28%
B 17%
C 27%
D 24%
When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
A True
B False
Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.
A Elastic strength
B Yield strength
C Shear strength
D None of these

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