Q1. Which of the following is not a piezo-electric material?
b) rochelle salt
d) barium titanate
Q2. Piezo-electricity is ______________
a) sound electricity
b) pressure electricity
c) temperature electricity
d) photo electricity
Q3. On applying electricity to piezo-electric material mechanical deformation occurs in the material.
Q4. Which of the following is a material employed making diaphragm to measure pressure?
b) barium titanate
c) phosphor bronze
d) zirconate titanate
Q5. Principle behind strain gauge is _____________
a) variable resistance
b) variable inductance
c) variable capacitance
d) variable contact area
Q6. On applying pressure to piezo-electric crystal, electricity is not generated.
Q7. The figure of merit which describes the overall behaviour of the wire under stress is determined from?
a) elastic modulus
b) gauge factor
c) elastic factor
d) gauge resistance
Q8. Gauge factor is defined as _______________
a) (incremental change in resistance due to stress/resistance of an unstretched wire)*(unstretched length of wire/incremental change in length)
b) (incremental change in resistance due to strain/resistance of an unstretched wire)*(unstretched length of wire/incremental change in length)
c) (incremental change in resistance due to stress/resistance of an unstretched wire)*(incremental change in length/unstretched length of wire)
d) (resistance of an unstretched wire/incremental change in resistance due to stress)*(unstretched length of wire/incremental change in length)l
Q9. Compensation for temperature variation in the leads can be provided by using ________ lead method.
Q10. Strain gauge is used to measure ______________