In the presence of a statistical series, the average value of a random variable is found as

+ weighted average;

In which of the given test plans failed products are not replaced, and tests are carried out until a certain operating time:

+ NVr

In which of thegiven test plans failed products are not replaced, and tests are conducted until a certain number of failures occur:

+ NRT

In which of thegiven test plans failed products are not replaced, and tests are conducted until all products fail:

+ NVN

In which of thegiven test plansfailed products are replaced with new ones or repaired, and tests are carried out until a certain number of failures occur:

+ NRr

In which of the given plansfailed products are replaced with new ones or repaired, and tests are conducted until a certain operating time is obtained:

+ NVr

In which of the test plans cited, failed products are not replaced, and tests are carried out until a certain operating time:

+ NVr

In the NUN test plan, the letter N means:

+ the number of products under surveillance;

Internal surfaces reinforce:

+ shot peening;

In case of fatigue wear, the lubricant affects:

+ reducing the wear process;

Mechanical types of wear include:

+ everything.

Maintenance is:

+ a set of operations to maintain the operability or serviceability of an object

Oxidative wear is:

 + wear in the presence of protective films on the friction surfaces;

One of the requirements for bearing alloys is:

+ ductility;

Random measures of dispersion include:

+ span, variance, standard deviation;

Reservation can be:

+ permanently loaded and unloaded;

Redundancy is applied for the purpose of:

+ improving the reliability of complex systems;

Reservation by accommodation means:

+ duplicate elements;

Redundancy makes it possible to create:

+ reliable systems of elements of high reliability;

Statistical control of reliability is carried out according to the following criteria:

+ economic and technical;

To increase the reliability of machines, the run-in is:

+ an operational measure;

To increase the reliability of parts, ................ is used:

+ their testing;

The amount of wear of parts in a batch is:

+ random discrete quantity;