In our electrical basic question is why we use relay to motor? and why can't an electrical engineer get job easy?

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Thank you for the invite, regret to inform that I would not be of any help to your question.

Relay is used for switching the winding to get reliable start, e.g first it turn on the starting winding with running winding to the main supply after that it switched to the running winding.

and engineer can not get job easily now a days because number of engineers are increased now days.

Motor protection or Motor management relays are used for the protection of Motor from many factors/faults like, Thermal Overloads, high bearing temperatures, over currents, loss of phase, vibrations, reverse power, under or over voltage etc.

Answer to second part. If you have appropriate experience and qualifications, there are tons of jobs for electrical engineers. Your approach for finding a job does matter.

Motor management relays are used for the protection of Motor from many factors/faults like, Thermal Overloads

Thank You for the invitation ... I will agree with the answers that really covered your question ...Variety of correct info !

this relay is control high voltage in motor and  is operated by key lock switch the relay itself may have up to 24 contact points with in unit itself. this allows the control power for multiple machine to be locked out by the turn of single key switch.

second of your equation,the reality wants engineers  much experience. 

You can find the same trick at work in all kinds of machines and electrical appliances, where sensors are ready to switch things on or off in a fraction of a second using clever magnetic switches called relays.