Deck 49: Design of Circuit 5 Solid State Thermostat

Question 1

Semiconductor materials exhibit a change of resistance with a change of temperature and have a  positive temperature coefficient.

Answer 1

False

Question 2

A semiconductor material's resistance will increase with an increase of temperature.

Answer 2

False

Question 3

If a ____ switch with crisscross connection is added to a circuit, a thermostat can be switched between  heating and cooling modes.

A) double-pole, double-throw
B) double-pole, single-throw
C) single-pole, single-throw
D) single-pole, double-throw

Answer 3

A

Question 4

In the accompanying figure, the negative source will be connected to pin #____.

A) 4
B) 5
C) 6
D) 7

Question 5

In the accompanying figure, the positive voltage source will be connected to pin #____.

A) 4
B) 5
C) 6
D) 7

Question 6

When a circuit is intended to be used as a heating thermostat, the operational amplifier must be  connected in such a manner that a drop in temperature will produce a ____ at the output.

A) negative voltage
B) positive voltage
C) negative resistance
D) positive resistance

Question 7

In the accompanying figure, a constant-current generator circuit is used to provide the current needed.

Question 8

Junction diodes can be used as temperature sensors by passing a constant current through them and  measuring the voltage drop across the PN junction.

Question 9

Since semiconductor materials have a negative temperature coefficient, an increase of temperature will  produce an increase in voltage across the diode.

Question 10

The voltage drop of a diode is not only proportional to temperature, the change is ____.

A) logarithmic
B) exponential
C) linear
D) geometric