Electric Motor-Driven Centrifugal Pumps: Chapter Overview

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What type of motor is primarily focused on in this chapter?

Steam turbine motor
Electric motor (correct)
Internal combustion engine motor
Hydraulic motor

How is the electric energy input to the motor converted?

It is converted to electrical energy
It is converted to mechanical energy (correct)
It is converted to hydraulic energy
It is converted to thermal energy

What happens if the parts are out of alignment, poorly installed, damaged, or worn?

The pump has a long life
The pump loses efficiency and may fail prematurely (correct)
The pump transfers more mechanical input energy
The pump operates smoothly and efficiently

What is the primary function of the pump in this context?

To pressurize and move fluid (A) Signup and view all the answers

What type of pumps are illustrated in Figure 1?

Centrifugal boiler feedwater pumps (C) Signup and view all the answers

What happens if the motor and pump are carefully installed and properly aligned?

The pump will operate smoothly and efficiently (D) Signup and view all the answers

What is the purpose of the coupling mentioned in the text?

To transmit mechanical energy from the motor to the pump (A) Signup and view all the answers

What is one factor that could cause the pump to fail prematurely?

Parts being out of alignment or poorly installed (B) Signup and view all the answers

What should receive special attention while installing, maintaining, and operating the pumps?

Proper alignment of parts (A) Signup and view all the answers

What is the primary source of mechanical energy for the pump?

Electric motor (A) Signup and view all the answers

What is the purpose of the bearing cover in a centrifugal pump?

To protect the bearing from dust, debris, and water (B) Signup and view all the answers

What is the function of a shaft sleeve in a centrifugal pump?

To protect the shaft from being damaged by the seal packing (D) Signup and view all the answers

What is the main function of wear rings in a centrifugal pump?

To prevent leakage between the hub of the rotating impeller and the stationary parts of the pump (C) Signup and view all the answers

What is the purpose of a slinger in a centrifugal pump?

To deflect leaking fluid away from the electric motor (D) Signup and view all the answers

What does a bearing housing do in a centrifugal pump?

Holds the bearing and supports the shaft (B) Signup and view all the answers

Why are wear rings installed on a centrifugal pump?

To prevent wear of the impeller and the pump casing (D) Signup and view all the answers

What is the role of a coupling in a centrifugal pump?

To transmit power from one shaft to another (D) Signup and view all the answers

What is the function of a seal cover or stuffing box in a centrifugal pump?

To stop fluid from leaking out of the pump along the shaft (A) Signup and view all the answers

What is the primary purpose of a metal base in a centrifugal pump?

To ensure proper alignment of the motor and pump (A) Signup and view all the answers

Why are bearings an important component of a centrifugal pump?

To reduce friction between the moving shaft and the pump casing (B) Signup and view all the answers