Operational Amplifier MCQs (Multiple Choice Questions) PDF Download - 130

Actual op-amp may have an open loop gain of

1. 10²
2. 10⁵
3. 10³
4. 10⁴

Kepler's 3rd law states that...

1. the periods of revolution of the planets are proportional to the cube of their mean distances from sun
2. the periods of revolution of the planets are inversely proportional to the cube of their mean distances from sun
3. the squares of the periods of revolution of the planets are proportional to the cube of their mean distance from sun
4. the squares of the periods of revolution of the planets are inversely proportional to the cube of their mean distance from sun

1 V is equal to

1. 1 J C^-1
2. 2 J C^-1
3. 1 J^-1 C
4. 2 J^-1 C

A voltmeter arranged across the power supply measures

1. potential difference
2. EMF
3. current
4. resistance

If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is

1. thrice the Earth's magnetic flux density
2. four times the Earth's magnetic flux density
3. five times the Earth's magnetic flux density
4. twice the Earth's magnetic flux density