What type of connector does one end of the extension cable have to connect to the probe
75-ohm miniature coaxial female connector
USB connector
100-ohm twisted pair connector
50-ohm BNC connector
What type of connector is found on the other end of the extension cable to connect to the proximitor
75-ohm miniature male connector
25-pin D-sub connector
Standard RCA connector
75-ohm miniature female connector
What does the proximitor contain in a proximity transducer system
The system electronics
The vibration rack
The probe tip assembly
The shaft and bearings
What does the tip assembly of the probe contain
A stainless-steel rod
A frequency generator
A coil terminated with a 75-ohm miniature tri-axial cable
A lubrication nozzle
What is the primary function of a transducer’s performance curve?
b. to set the gap on the probe
a. to calibrate the proximitor
d. to be useful as a maintenance record
c. to reveal the transducer’s scale factor and linear range
What is the scale factor shown in the performance curve?
20 mv/mil
20 volt/mil
200 volt/mil
200 mv/mil
Where is the proximitor normally mounted in a continuously monitoring system
In a junction box
Next to the lubrication system
Inside the probe casing
On the machine shaft
Which type of transducer measures and converts shaft vibration
Accelerometer
Phase angle meter
Proximity device
Seismic device
What are the two basic methods of equipment protection monitoring
Electrical and mechanical
Continuous and periodic
Internal and external
Automatic and manual
Which component in the monitoring system controls system resets
Transducer
Power supply
System monitor
Field wiring
How many monitors and their transducers can the power supply provide regulated power to
20
8
4
12
In a vibration monitoring system, which component provides the link between the transducer and the monitoring system?
Probe
Field wiring
Junction box
Alarm circuit
What is the function of the power supply in a monitoring system rack
To reduce machine noise
To align the shaft and bearings
To provide regulated power to monitors and transducers
To convert vibration into electronic signals
Which of the following can be included in a monitoring rack
Voltage, current, power factor
Lubrication pressure, fuel level, shaft diameter
Alignment, balance, belt tightness
Acceleration, velocity, dual temperature
What occurs when probe does not have enough side clearance around the tip?
c. side view occurs
b. crosstalk occurs
d. voltage drops
a. linear range occurs
Where are permanent monitoring systems normally mounted
Inside the motor casing
On the shaft directly
In racks
In the bearing housing
When do crosstalk problems occur?
when the dc voltage supply is too low
when two probes are mounted too close together
when the system components are mismatched
when a probe is mounted in an area with not enough side
What is the main function of a transducer in a vibration monitoring system
To lubricate the bearings
To balance the shaft
To reduce machine speed
To measure and convert vibration into electronic signals
Which of the following voltages can the power supply convert into the DC voltages used by monitors and transducers?
115 Vac, 220 Vac, +20 to +34 Vdc, +90 to +140 Vdc
50 Hz and 60 Hz AC
24 Vac and 48 Vac
+5 Vdc and +12 Vdc only
Which of the following are the three basic parts of a monitoring system rack
Power supply, system monitor, vibration and thrust monitors
Shaft, bearings, and coupling
Alarm system, shutdown system, and data acquisition system
Probe, extension cable, and proximitor
Which of the following are the main components of a continuous monitoring system
Motor, pump, turbine
Shaft, bearings, coupling
Transducer, field wiring, monitoring system
Probe, proximitor, junction box
Where is the proximity probe installed
On the machine you want to monitor
On the proximitor
In the vibration rack
Inside the extension cable
What is the function of field wiring in a continuous monitoring system
To measure casing vibration
To reduce shaft misalignment
To power the motor
To connect the monitoring system to the transducer
What is the function of the extension cable in a proximity transducer system
To generate the RF signal
To measure shaft displacement directly
To connect the probe to a convenient junction box
To reduce machine vibration
What supply voltages can be selected for transducers in a monitoring system
-24 Vdc or -18 Vdc
+12 Vdc or +15 Vdc
+24 Vdc or +18 Vdc
-12 Vdc or -5 Vdc
What angle is used when installing Vibration probes
c. 90° from the vertical
b. 25° from the horizontal
d. 70° from the vertical
a. 45° from the vertical
What are the three main components of a proximity transducer system
Probe, lubricator, and vibration meter
Probe, shaft, and rotor
Probe, extension cable, and proximitor
Probe, bearing, and motor
Why do most monitoring systems use two probes installed 90° apart
To detect shaft movement in all directions
To increase shaft speed
To reduce electromagnetic field strength
To balance the shaft load
What occurs when RF fields of probes are interact with each other?
voltage drops
side view occurs
linear range occurs
crosstalk occurs
What is the reading on the micrometer shown?
c. 165 mils
b. 245 mils
d. 265 mils
a. 255 mils
What does the continuous monitoring method do
Monitors equipment data at regular intervals
Monitors equipment constantly
Checks equipment only after shutdown
Uses only portable instruments
How does the periodic monitoring method collect data
By checking lubrication levels
By using portable instruments at regular intervals
by using permanently installed sensors
By observing equipment visually
Which parameter is not typically monitored by parameter-specific monitors
Dual thrust
Speed of rotation
Dual vibration
Shaft alignment
What do parameter-specific monitors in a monitoring system provide
Power supply voltages
Lubrication levels of the bearings
Alignment of the shaft
Views of the condition of the machinery
What is the reading on the micrometer shown?
b. 217 mils
d. 242 mils
c. 238 mils
a. 213 mils
Which of the following is one function of the system monitor
To align the shaft and bearings
To generate RF signals for the probe
To check the voltage supplies
To convert vibration into electronic signals
When do side view problems occur?
the system components are mismatched
a probe is mounted in an area with not enough side clearance
the dc voltage supply is too low
two probes are mounted too close together
Which of the following is one function of monitors in the system rack
To generate RF signals for the probe
To connect probes to the proximitor
To provide regulated power to the rack
To show that the transducer system is operating properly
What does the system monitor control in the monitoring system
Shaft speed and lubrication
The system’s OK relay, resets, and alarm settings
The proximity probe electromagnetic field
The field wiring connections
What is the un-reliable reading Gap section shown in the performance curve?
0 to 10 mils
25 to 75 mils
0 to 20 mils
35 to 95 mils
What is the function of the monitoring system in a vibration monitoring setup
How are probes typically positioned in monitoring systems to measure shaft movement in all directions
Opposite each other at 180°
Side by side at 0°
Installed 90° apart
Placed randomly around the shaft
Which type of transducer measures and converts casing vibration
RMS device
Frequency probe
Seismic device
Proximity device
How does the system monitor support data collection and manipulation
By monitoring belt tension
By storing lubrication records
By regulating shaft vibration
By providing a communication link