solve quickly and should be correct do not guess the answer . explain all .I wil
ID: 2267805 • Letter: S
Question
solve quickly and should be correct do not guess the answer . explain all .I will rate .
Student Assessment 2 1. A log scale (logarithmie) potentiometer is most suitable for use as a: linear voltage controller rotary positional transducer a linear positional transducer c sound volume controller d A variable resistor is stated to be wirewound. It is most likely to be: al linear because the resistance will be constant along the wire's length 2. linear as long as it is of the slide (not rotary) type e logarithmic because of the inductance of the coiled wire d non-linear because of the difficulty of making wire of a constant resistance tO Fig I A linear potentiometer (as in Fig 1 above) has control settings of 1-10 and is connected to a +9V, 0, -9V supply, with the -9V connection made to the end marked setting "1". The voltage at the setting marked "6" will be: a -IV 3. d +1.8v A 10k linear potentiometer is connected to a 12V supply, with the output circuit loaded by a 5 load, the output voltage in the mid position (A) and maximum setting (B) will be: 4. A-6v, B = 12V[b] A-3v, B-12vC] A-4V, B-w @ A-4v. B-12v 5. A wirewound variable resistor consists of 1200 turns of wire. Assuming that the wiper only makes contact with one turn at any time, and the applied voltage across the track is 10V, the resolution in terms of the output voltage will be: 8.3mV 10mV 16.7mV Continued 31Explanation / Answer
1. (c)
Explanations: All the options other than (c) are linear. When sound is required to cater human ear , which is not linear eliment , a non linear pot only can be suitable. Hence (c) is the right choice.
2. (b)
Eplanations: In rotary wirewound resisantace the sliding contact move from one round wire to the next round wire , hence movemet from one round wire to next round wire is discontineous in nature but behave as a linear as long as it is slide type( non rotary type).
3 (c) Totol potential is 18 v (-9 to +9) between contact 1 and 10. Therefore change of each contact can cause change of 2 volts. In contact position 6 change of potential should be 10 volts hence potencial will be 10-9=1 volt. The following diagram explan the situation clearly.
1- ;-9 v
2- ;-9+2=-7 v
3- ;-7+2=-5v
4- ;-5+2=-3v
5- ; -3+2=-1v
6- ;-1+2=1v
7- =3 v
8- =5v
9- =7v
10- =9v
5 (a) 10 volt is distributed in 1200 turn. Hence one turn change cause (10/1200)= 8.3mv , which is the resolution.
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