Dual slope integration type Analog-to-Digital converters provide

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ESE Electronics 2013 Paper 2: Official Paper

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Higher speeds compared to all other types of A / D converters
Very good accuracy without putting extreme requirements on component stability
Poor rejection of power supply hum
Better resolution compared to all other types of A / D converters for the same number of bits

Answer 1

Dual slope ADC:

These reduce design complexity and improves measurement quality.
Dual-Slope integration type ADC is the most accurate type of ADC because of non-dependency on variation in components values caused by noise.
It is quite slow in nature and used in application as digital voltmeter, multimeters etc.
In dual slope and single slope ADCs instead of using a DAC with a ramped output, we use an op-amp circuit called integrator to generate a sawtooth wave.
These are used in the precision application.

Dual slope ADC

F1 S.B 4.8.20 Pallavi D17