Related Questions

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.
A Working
B Damaging
C Allowable
D None of these
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
In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on
A horizontal plane only
B vertical plane only
C both horizontal and vertical planes
D all planes except horizontal and vertical planes
Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Such materials are called
A Piezo-electric
B Photo-electric
C Thermo-electric
D Photo-resistive
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
Piezoelectric is a material
A Whose properties is midway between the constituent materials
B Which gets polarised, when stressed
C In which magnetising force reduces when current flowing through it is in-cresed
D Which changes dimensions due to applied field
In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are
A Equal
B Proportional to their respective moduli of elasticity
C Inversely proportional to their moduli of elasticity
D Average of the sum of moduli of elasticity
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
Which of the following capacitors is polarized?
A Mica
B Ceramic
C Plastic-film
D Electrolytic

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