Question 378General Subjects - Assistant Engineer
70% to passThe capacity of a gear type rotary pump, when operated at a constant speed, will decrease with an increase in the pump _______________.
Adischarge volume
Bsuction pressure
Ctorque rating
Drotor clearances
AI Explanation
The correct answer is D) rotor clearances. The capacity of a gear type rotary pump operated at a constant speed will decrease with an increase in the pump's rotor clearances. As the clearances between the rotors and the pump housing increase, it allows more fluid to leak back from the discharge side to the suction side, reducing the overall volumetric efficiency and capacity of the pump. The other options are incorrect because: A) Discharge volume is not a factor that affects pump capacity when operated at a constant speed; B) Suction pressure is a different parameter that affects pump performance but not necessarily the capacity; and C) Torque rating is not directly related to the pump's capacity.
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