Answer:
The suction pressure decreases and the superheat increases when the liquid line is restricted and the supply of refrigerant to the metering device is reduced.
Explanation:
1. The five components of refrigeration are:
- Fluid refrigerant
 - Compressor
 - Condenser coil
 - Evaporator coil
 - Expansion device.
 
        The compressor limits the vapor released by the refrigerant. This            
        causes a  rise in pressure (in refrigerant), which then pushes the  
        vapor into the coils on the outside of the refrigerator. 
2. Now when the cooler air meets the warm gas present in the coils, it 
    gets converted into liquid form.
3. Thus, when the liquid form is at high pressure, the refrigerant then   
    cools down as it flows through the coils placed in the fridge ( in both 
    freezing and normal sections).
4. The refrigerant also absorbs the warm air present in the fridge, which   
    causes it to evaporate and flow back through the compressor and the 
    cycle repeats in the same form.
Thus, when the liquid line is restricted and the supply of refrigerant to the metering device is reduced it causes a decrease in suction pressure and an increase in superheat.
Learn more about refrigeration here:
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