EPRI EXAM PREP QUESTIONS WITH
CORRECT ANSWERS!!
What is Newton's First Law?
Law of inertia.
What is Newton's Second Law?
The acceleration of an object is proportional to the vector resultant of all forces acting on it, and
the acceleration is in the direction of this resultant vector.
F=ma
What is Newton's Third Law?
The forces of action and reaction between interacting bodies are equal in magnitude, opposite in
direction, and collinear.
What is the spring formula?
F = k*delta(X)
What is free vibration and what kind of motion does it have? What kind of wave?
When the system continues to oscillate without any damping effects. The motion is called simple
harmonic motion.
Sine Wave
What is natural frequency? What is the equation?
The frequency at which a mechanical system will vibrate freely.
fn=(1/2pi)*sqrt(k/m)
At what frequency do forced vibration systems vibrate at? How does natural frequency
effects this?
Always at the frequency of the input frequency after they reach steady state.
Only the brief, transient portion of the response immediately after start-up.
What is a damper?
, An object that will dissipate energy by turning mechanical energy into thermal energy.
What are the two types of pumps? What kind of motion do they have?
Centrifugal Pumps - Rotary
Positive Displacement Pumps - Rotary or Reciprocating
What do pumps do?
Move a volume of water form a lower pressure to a higher pressure.
What are the important pumps in a BWR called?
Recirc Pumps
How does a positive displacement pump work? How do you control flow?
Transfers a given quantity of fluid per shaft revolution or plunger stroke. To control flow, you
must change operating speed, a length of stroke, or a bypass valve.
How does a centrifugal pump work? How do you control flow?
Imparts a kinetic energy to the liquid being pumped and then transforms this kinetic energy into
flow and pressure. To control flow you must vary system discharge resistance usually with a
control valve or by varying operating speed.
What is unique about a PDP?
Will produce the same flow at a given speed no matter the discharge pressure. Often referred to
as a "constant flow machine".
What happens if a valve downstream of a PDP closes?
The pump can continue pumping until equipment failure occurs.
What are PDP pumps commonly used for?
Make up flow, CVCS, and Hydrostatic pressure tests.
What are the types of PDP's?
CORRECT ANSWERS!!
What is Newton's First Law?
Law of inertia.
What is Newton's Second Law?
The acceleration of an object is proportional to the vector resultant of all forces acting on it, and
the acceleration is in the direction of this resultant vector.
F=ma
What is Newton's Third Law?
The forces of action and reaction between interacting bodies are equal in magnitude, opposite in
direction, and collinear.
What is the spring formula?
F = k*delta(X)
What is free vibration and what kind of motion does it have? What kind of wave?
When the system continues to oscillate without any damping effects. The motion is called simple
harmonic motion.
Sine Wave
What is natural frequency? What is the equation?
The frequency at which a mechanical system will vibrate freely.
fn=(1/2pi)*sqrt(k/m)
At what frequency do forced vibration systems vibrate at? How does natural frequency
effects this?
Always at the frequency of the input frequency after they reach steady state.
Only the brief, transient portion of the response immediately after start-up.
What is a damper?
, An object that will dissipate energy by turning mechanical energy into thermal energy.
What are the two types of pumps? What kind of motion do they have?
Centrifugal Pumps - Rotary
Positive Displacement Pumps - Rotary or Reciprocating
What do pumps do?
Move a volume of water form a lower pressure to a higher pressure.
What are the important pumps in a BWR called?
Recirc Pumps
How does a positive displacement pump work? How do you control flow?
Transfers a given quantity of fluid per shaft revolution or plunger stroke. To control flow, you
must change operating speed, a length of stroke, or a bypass valve.
How does a centrifugal pump work? How do you control flow?
Imparts a kinetic energy to the liquid being pumped and then transforms this kinetic energy into
flow and pressure. To control flow you must vary system discharge resistance usually with a
control valve or by varying operating speed.
What is unique about a PDP?
Will produce the same flow at a given speed no matter the discharge pressure. Often referred to
as a "constant flow machine".
What happens if a valve downstream of a PDP closes?
The pump can continue pumping until equipment failure occurs.
What are PDP pumps commonly used for?
Make up flow, CVCS, and Hydrostatic pressure tests.
What are the types of PDP's?
