Lecture 8) choose the correct answer

Term
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A device that converts ...
a) an electric generator
b) a cathode ray tube mechanical energy to electrical energy is called
c) a motor
d) a galvanometer
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Terms in this set (10)
A device that converts ...
a) an electric generator
b) a cathode ray tube mechanical energy to electrical energy is called
c) a motor
d) a galvanometer
an electric generator
A triode usually functions with a control grid at ... potential with respect to cathode .
a) positive
b) high positive
c) zero
d) negative
negative
A grid-controlled vacuum tube acts as ...
a) a x-ray source
b) an amplifier
c) a rectifier
d) an oscillator
an amplifier
The temperature transducer that does not require power supply to operate is: ...
a) electrical resistance thermometer
b) thermistor
c) thermocouple
d) all of the above
thermocouple
The decrease of resistance with the temperature is a property of: ...
a) thermocouple
b) bimetallic thermometer
c) thermistor
d) electrical resistance thermometer
electrical resistance thermometer
The part of the thermocouple that is kept at a known temperature is called
a) multimeter
b) reference junction
c) measuring junction
d) galvanometer
e) electrical resistance thermometer
reference junction
In a metal
a) free charge carriers are the electrons and the holes
b) the conductivity decreases with the increase in temperature
c) the conduction band is empty
d) none of the above
the conductivity decreases with the increase in temperature
The resistance of a thermistor changes with temperature according to the expression
a ) RT = Ae^-B/T
b ) RT = Ae^B/T
c ) RT = Ae^T/B
d ) RT = Ae^-T/B
RT = Ae^B/T
According to Ohm's law for a part of a circuit:
a) R = U/I
b) R = I/U
c) R = IU
d) R = IU^-1
R = U/I
For the small temperature differences , the electromotive force E of thermocouple can be determined using the equation :
a ) E=a (t2- t1)
b ) E=a (t2 - t1)⁻¹
c ) E=a/(t2 - t1)
d ) E= (t2 - t1)/a
E=a(t2-t1)