Mechanical Engineering Quiz # 11

The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

Agree

Disagree

The thermal efficiency of diesel engines on weak mixtures is

Lower

Dependent on other factors

Higher

Unaffected

Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

Carbon dioxide

Graphite

No moderator is needed

Heavy water

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

25%

50%

70%

100%

The detonating tendency in petrol engines increases with increase of compression ratio.

True

False

The predominent isotope of the naturally occuring element is

Pu239

Pu233

U238

U235

The purpose of micromotion study is to

All of these

Help in collecting the motion time data for synthetic time standards

Assist in finding out the most efficient way of doing work

Train the individual operator regarding the motion economy principles

A device used for lifting or lowering objects suspended from a hook at the end of retractable chains or cable is called

Jib crane

Portable elevator

Hoist

Chain conveyor

The correct sequence of phases in value engineering is

Investigation phase, information phase, creative phase, evaluation phase

Creative phase, investigation phase, evaluation phase, information phase

Creative phase, information phase, investigation phase, evaluation phase

Information phase, creative phase, investigation phase, evaluation phase

F. W. Taylor introduced a system of organisation known as

Line organisation

Line and staff organisation

Line, staff and functional organisation

Functional organisation

Micromotion study is

Motion study, when seen on a time chart

Analysis of one stage of motion chart

Subdivision of an operation into therbligs and their analysis

Enlarged view of motion study

Scheduling

Prescribes the sequence of operations to be followed

Regulates the progress of job through various processes

Determines the programme for the operations

Is concerned with starting of processes

PERT is an event oriented technique.

Incorrect

Correct

A critical activity has

Maximum slack

Average slack

Zero slack

Minimum Slack

Probabilistic time for completion of any activity can be found out from

Most likely time

Optimistic time

All of these

Pessimistic time

Valve analysis is particularly of interest when

Only few components are involved

Production is on large scale

Costly equipment is used

Jobbing work economics are involved

Fixed position layout is also known as

Synthetic layout

Analytical layout

Static product layout

None of these

The type of organisation preferred for a steel industry, is

Line and staff organisation

Line, staff and functional organisation

Line organisation

Functional organisation

Production cost refers to prime cost plus

Factory overheads

Factory, administration and sales overheads

Factory, administration, sales overheads and profit

Factory and administration overheads

Which one of the following chart gives simultaneously information about the progress of work and machine loading?

Man-machine chart

Process chart

Machine load chart

Gantt chart

Which of the following statement is correct?

Economic order quantity formula ignores variations in demand pattern

Simulation can be used for inventory control.

All of these

A-B-C analysis is based on Pareto's principle.

In A-B-C analysis, which class of items are generally large in number?

C

A

None of these

B

Job evaluation is the method of determining the

Value of overall production

Worth of the machine

Worker's performance on a job

Relative values of a job

In value engineering, the term value refers to

Manufacturing cost of the product

Total cost of the product

Utility of the product

Selling price of the product

For material transportation, conveyors are used when the prevailing conditions include

Loads are uniform

All of these

Materials move relatively continuously

Routes do not vary

When slack of an activity is negative

It represents that a programme falls behind schedule and additional resources are required to complete the project in time

It represents a situation where extra resources are available and the completion of project is not delayed

The activity is critical and any delay in its performance will delay the completion of whole project

All of these

In second type of levers,

Effort is in between the fulcrum and load

Load is in between the fulcrum and effort

None of these

Fulcrum is in between the load and effort

All stresses produced in a belt are

Both tensile and compressive stresses

Compressive stresses

Shear stresses

Tensile stresses

Slenderness ratio is the ratio of

Effective length of column to width of column

Width of column to depth of column

Effective length of column to least radius of gyration of the column

Maximum size of column to minimum size of column

According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

2 mm for rivet diameter from 39 mm to 48 mm

0.5 mm upto rivet diameter of 24 mm

1 mm for rivet diameter from 27 mm to 36 mm

All of these