CMRT Predictive Maintenance Technologies Questions and Answers

Question 1

A vibration analyst observes a predominant spectral peak at two times (2x) the running speed on a direct-coupled pump and motor.
This is a classic indicator of which of the following mechanical faults?

Accepted Answer

Angular misalignment

Answer

Component imbalance

Answer

Advanced bearing wear

Answer

Structural looseness

Question 2

While performing an infrared scan on an energized Motor Control Center (MCC) panel, a technician identifies a circuit breaker's terminal lug that is significantly hotter than adjacent ones under similar load. What is the most probable cause of this thermal anomaly?

Accepted Answer

High electrical resistance

Answer

Excessive motor amperage draw

Answer

Incorrectly sized circuit breaker

Answer

High ambient air temperature

Question 3

A technician is using an ultrasonic sensor to perform condition-based lubrication on a motor bearing. What is the primary indicator that the correct amount of grease has been applied?

Accepted Answer

The decibel (dB) level of the bearing drops to a normal baseline.

Answer

The temperature of the bearing begins to decrease.

Answer

A small amount of grease begins to purge from the bearing seal.

Answer

The overall vibration amplitude of the motor decreases.

Question 4

An oil analysis report for a large hydraulic system shows a high particle count, an elevated silicon (Si) level, and a noticeable increase in oil viscosity. Which of the following is the most likely root cause?

Accepted Answer

Ingress of dirt and dust from the environment

Answer

Thermal breakdown (oxidation) of the oil

Answer

Internal pump component fatigue

Answer

Water contamination from a heat exchanger leak

Question 5

Which of the following predictive technologies is most effective for detecting broken or cracked rotor bars in an AC induction motor while the motor is in operation?

Accepted Answer

Motor Current Signature Analysis (MCSA)

Answer

Airborne Ultrasonics

Answer

Infrared Thermography

Answer

Strobe Light Analysis

Question 6

When considering the P-F Curve, which of the following predictive maintenance technologies would typically be the EARLIEST to detect the onset of a subsurface bearing fault, such as a microscopic crack?

Accepted Answer

Acoustic Emission / Stress Wave Analysis

Answer

Vibration Analysis

Answer

Infrared Thermography

Answer

Human Senses (audible noise)

A vibration analyst observes a predominant spectral peak at two times (2x) the running speed on a direct-coupled pump and motor.This is a classic indicator of which of the following mechanical faults?

A vibration analyst observes a predominant spectral peak at two times (2x) the running speed on a direct-coupled pump and motor.
This is a classic indicator of which of the following mechanical faults?