# MCQs on Analog Signal Conditioning – Current to Voltage Converters

1 - Question

Ohm’s law gives a relation between voltage and resistance.
a) True
b) False
Explanation: Ohm’s law does not give relation between voltage and resistance. The ohms law establishes a relationship between voltage and current. Resistance is the proportionality constant. In equation form, ohms law can be expressed as V=I*R, where all variables have their usual meaning.

2 - Question

What is the current flowing through a resistor of 12ohm if the voltage drop across a resistor is 4 volts?
a) 4Ampere
b) 3Ampere
c) 2Ampere
d) 6Ampere
Explanation: 3Ampere current flowing through a resistor of 12ohm if the voltage drop across a resistor is 4 volts. Since we know from the ohm’s law we know that V=IR where V is the voltage drop across the resistor, I is the current flowing through it and R is the resistance value of it, therefore I=V/R, which gives I=>12/4=3ampere.

3 - Question

Resistance of a substance does not change if we alter its shape or length.
a) True
b) False
Explanation: Resistance of a substance changes, if we alter its shape or length. Resistance is directly proportional to the length of the substance and inversely proportional to its area. Resistivity of a material remains constant. advertisement

4 - Question

What should be the resistance placed across a voltage source in order to generate a current of 6ampere from a voltage source of 12volts?
a) 2ohms
b) 72 ohms
c) 4 ohms
d) 1 ohm
Explanation: A resistance of 2 ohm should be placed across a voltage source in order to generate a current of 6 ampere from a voltage source of 12volts. From the ohm’s law we know that V=IR, therefore resistance=V/I=>12/6=2ohms.

5 - Question

Which is a voltage to current converter?
a) BC541
b) XTR111
c) TIP122
d) TIP135
Explanation: XTR111 is a voltage to current converter. It is a very precise voltage to current converter designed by the Texas Instruments. It has an adjustable voltage regulator with a wide output supply range.

6 - Question

Trans-impedance amplifier is more efficient than a resistance in terms of current to voltage conversion?
a) True
b) False
Explanation: Trans-impedance amplifier is more efficient than a resistance in terms of current to voltage conversion. The output impedance is expected to be low, for driving any device. Op-Amp has very less output impedance which makes it better for current to voltage conversion. Also, it has very high input impedance which consumes very less current in the input.

7 - Question

What is the ratio of current to the voltage called?
a) Resistivity
b) Resistance
c) Conductance
d) Impedance
Explanation: The ratio of current to the voltage is called as conductance. It is the reciprocal of resistance. It is the degree or the measure of how easily the electric current can flow through a substance. Its unit is mho also called as ohm inverse.

8 - Question

What is the ratio of voltage to current called?
a) Resistivity
b) Resistance
c) Conductance
d) Impedance
Explanation: The ratio of current to the voltage is called as resistance. It is the degree or the measure of opposition of flow of electric current through a substance. Its unit is ohm. It is generally denoted by “R”.

9 - Question

What should be the resistance placed across a voltage source in order to generate a current of 6ampere from a voltage source of 24volts?
a) 2ohms
b) 72 ohms
c) 4 ohms
d) 1 ohm
Explanation: A resistance of 4 ohm should be placed across a voltage source in order to generate a current of 6 ampere from a voltage source of 12volts. From the ohm’s law we know that V=IR, therefore resistance=V/I=>24/6 = 4ohms.

10 - Question

What is the current flowing through a resistor of 24ohm if the voltage drop across a resistor is 4 volts?
a) 4Ampere
b) 3Ampere
c) 2Ampere
d) 6Ampere
Explanation: 6Ampere current flowing through a resistor of 24ohm if the voltage drop across a resistor is 4 volts. Since we know from the ohm’s law we know that V=IR where V is the voltage drop across the resistor, I is the current flowing through it and R is the resistance value of it, therefore I=V/R, which gives I=>24/4=6ampere.

11 - Question

Resistivity of a substance does not change if we alter its shape or length.
a) True
b) False
Explanation: Resistivity of a substance does not change if we alter its shape or length. Resistivity is the property of a material, which does not vary with length and size. Resistance of a substance changes, if we alter its shape or length.

12 - Question

Which among the following can be termed as voltage to current converter?
a) Current controlled current source
b) Current controlled voltage source
c) Voltage controlled current source
d) Voltage controlled voltage source
Explanation: Voltage controlled current source can be termed as voltage to current converter. In this type of sources, the output current depends on some external voltage drop or voltage source, which is why they are named so.

13 - Question

What is the current flowing through a resistor of 24 ohms if a capacitor of 10 microfarads is placed in series to a resistor along with 10V DC voltage supply?
a) 4Ampere
b) 3Ampere
c) 2Ampere
d) 0Ampere
Explanation: No current or 0 current flows through a resistor of 24 ohms if a capacitor of 10 microfarads is placed in series to a resistor along with 10V DC voltage supply. Since capacitor does not allow any DC current to pass through it so the current flowing across the resistor is 0.

14 - Question

What is the current flowing through a resistor of 24 ohms if a capacitor of 10 microfarads is placed in parallel to the resistor and 4V DC voltage supply is placed in series with the resistor?
a) 4Ampere
b) 3Ampere
c) 6Ampere
d) 0Ampere
Explanation: 6ampere current flowing through a resistor of 24ohm if the voltage drop across a resistor is 4 volts. The capacitor will act as open circuit and no current will pass through it as DC voltage is applied. And since we know from the ohm’s law we know that V=IR where V is the voltage drop across the resistor, I is the current flowing through it and R is the resistance value of it, therefore I=V/R, which gives I=>24/4=6ampere.

15 - Question

What is the current flowing through a resistor of 4 ohms if a capacitor of 10 microfarads is placed in series to a resistor along with 5V DC voltage supply?
a) 4Ampere
b) 3Ampere
c) 2Ampere
d) 0Ampere .