Redundancy is related to

Addition of extra system or subsystems

Rate of failure in Bath tub curve is

Highest during starting of life cycle

Lowest during starting of life cycle

Constant throughout the life cycle

frequency with which an engineered system or component fails

Number of subsystems in a system

What is true about Maintainability

Maintainability is defined as the probability of performing a successful repair action within a given time.

It is the degree to which a system, subsystem or equipment is in a specified operable and committable state at the start of a mission, when the mission is called for at an unknown, i.e. a random, time.

It is the degree of freedom of a system.

It deals with the operating time of a system/ sub-system.

Which one is true about Availability

The degree to which a system, subsystem or equipment is in a specified operable and committable state at the start of a mission, when the mission is called for at an unknown, i.e. a random, time.

It is defined as the probability of performing a successful repair action within a given time.

It deals with the degree of freedom of a system/ sub-system.

It is the downtime of a system.

Which one is not true about Quality of a system

Totality of characteristics which act to satisfy a need

Which one is not false about Fault Tree Analysis

It is a top-down, deductive failure analysis in which an undesired state of a system is analyzed using Boolean logic to combine a series of lower-level events.

It is the ease of working or repair of a system after a failure.

It depends upon the output of the system.

A set of system components which, when fail, cause failure of the entire system.

A set of components whose failure results in system success.

A set of system components whose success, cause failure of the entire system.

A set of components whose success results in system success.

A set of components whose failure results in system success.

A set of system components whose success, cause failure of the entire system.

A set of system components which, when fail, cause failure of the entire system.

Event Tree Analysis is

A logical model for both failure and success responses from individual factor.

A logical model for only success responses from individual factor.

A logical model for only failure responses from individual factor.

Dependability is concerned about :

Safety and security of a system.

Bayes Theorem is given as:

P ( A B ) = P ( A ) . P ( B A ) P ( B ) P\left(\frac{A}{B}\right)=\frac{P\left(A\right).P\left(\frac{B}{A}\right)}{P\left(B\right)} P ( B A ) = P ( B ) P ( A ) . P ( A B )

P ( A B ) = P ( A ) + P ( B ) P\left(\frac{A}{B}\right)=P\left(A\right)+P\left(B\right) P ( B A ) = P ( A ) + P ( B )

P ( A B ) = P ( A ) − P ( B ) P\left(\frac{A}{B}\right)=P\left(A\right)-P\left(B\right) P ( B A ) = P ( A ) − P ( B )

P ( A B ) = P ( B ) + P ( B A ) P\left(\frac{A}{B}\right)=P\left(B\right)+P\left(\frac{B}{A}\right) P ( B A ) = P ( B ) + P ( A B )

If A and B are mutually inclusive events, then P ( A o r B ) = P\left(A\ or\ B\right)= P ( A o r B ) =

P ( A ) + P ( B ) − P ( A a n d B ) P\left(A\right)+P\left(B\right)-P\left(A\ and\ B\right) P ( A ) + P ( B ) − P ( A a n d B )

P ( A ) + P ( B ) P\left(A\right)+P\left(B\right) P ( A ) + P ( B )

P ( A ) − P ( B ) P\left(A\right)-P\left(B\right) P ( A ) − P ( B )

P ( A ) + P ( B ) + P ( A a n d B ) P\left(A\right)+P\left(B\right)+P\left(A\ and\ B\right) P ( A ) + P ( B ) + P ( A a n d B )

Reliability of a system (A) with two sub-systems (B and C) in series is given by

R ( A ) = R ( B ) . R ( C ) R\left(A\right)=R\left(B\right).R\left(C\right) R ( A ) = R ( B ) . R ( C )

R ( A ) = R ( B ) + R ( C ) R\left(A\right)=R\left(B\right)+R\left(C\right) R ( A ) = R ( B ) + R ( C )

R ( A ) = R ( B ) − R ( C ) R\left(A\right)=R\left(B\right)-R\left(C\right) R ( A ) = R ( B ) − R ( C )

R ( A ) = 1 − ( 1 − R ( B ) ( 1 − R ( C ) ) ) R\left(A\right)=\ 1-\left(1-R\left(B\right)\left(1-R\left(C\right)\right)\right) R ( A ) = 1 − ( 1 − R ( B ) ( 1 − R ( C ) ) )

Reliability of a system (A) with two sub-systems (B and C) in parallel is given by

R ( A ) = 1 − ( 1 − R ( B ) ( 1 − R ( C ) ) ) R\left(A\right)=1-\left(1-R\left(B\right)\left(1-R\left(C\right)\right)\right) R ( A ) = 1 − ( 1 − R ( B ) ( 1 − R ( C ) ) )

R ( A ) = R ( B ) + R ( C ) R\left(A\right)=R\left(B\right)+R\left(C\right) R ( A ) = R ( B ) + R ( C )

R ( A ) = R ( B ) . R ( C ) R\left(A\right)=R\left(B\right).R\left(C\right) R ( A ) = R ( B ) . R ( C )

R ( A ) = R ( B ) − R ( C ) R\left(A\right)=R\left(B\right)-R\left(C\right) R ( A ) = R ( B ) − R ( C )

Reliability Engineering (REE-077)

Authored by Ramesh Singh

Mathematics

University

Used 46+ times

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Reliability is:

Assurity of working of a system

Related to cost of a system

Assurity of not working of a system

Related to size of a system

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Failure is:

An event

A state

Choice

Good

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Fault is

Event

State

Choice

Good

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Cold standby

Has small downtime

Has large downtime

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Hot standby

Has small downtime

Has large downtime

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Addition of subsystems in series:

Increases the risk of failure of system

Decreases the risk of failure of system

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Addition of subsystems in parallel:

Increases reliability

Decreases reliability

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Reliability Engineering (REE-077)

Reliability is:

Failure is:

Fault is

Cold standby

Hot standby

Addition of subsystems in series:

Addition of subsystems in parallel:

Mutually Inclusive systems have

Mutually exclusive systems have

Error is

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