Basic Instrumentation Ch 3

Question 1

When force is added the valve will close or pushing up on the valve stem causes the valve to close is mean by a reverse-acting valve

a) True
b) False

Answer 1

a) True

Question 2

Valve bodies consist of what?
(there are 4)

a) 3-way vlv bodies
b) gate vlv bodies
c) solenoid vlv bodies
d) inflow vlv bodies
e) small flow rate vlv bodies
f) butterfly vlv bodies

Answer 2

a, b, e, f,

3-way, gate, small flow rate, butterfly

Question 3

It is the volume in gallons of water that will flow through the wide open valve per minute with a pressure drop on one psi across the valve would best describe COEFFICIENT

a) true
b) false

Answer 3

a) true

Question 4

The term valve trim refers to the kind of material used to make external valve parts

a) true
b) false

Answer 4

b) false

Question 5

What qualities must a valve stuffing box have

a) leak resistance
b) create minimum friction
c) be high temperature rated
d) both A and B

Answer 5

d) both A and B

Question 6

A controlled volume pump’s output is proportional to the square of its input speed

a) True
b) False

Answer 6

b) False

Question 7

What is the standard air pressure used for control purposes

a) 20-40 psig
b) 3-15 psig
c) 10-25 psig
d) 45-55 psig

Answer 7

b) 3-15 psig

Question 8

Electric-hydraulic is the electric signal that changes a hydraulic actuator to set the force necessary for the change

a) True
b) False

Answer 8

a) True

Question 9

Name two types of electrically powered devices that position control elements:

a) hydraulic
b) solenoid
c) pneumatic
d) electric motor operated
e) suction elbow

Answer 9

b) solenoid

d) electric motor operated

Question 10

What are two typed of pneumatic position actuators

a) heat exchanger
b) proportional
c) on-off service
d) sump pump
e) solenoid valve

Answer 10

b) proportional

c) on-off service