Electronics and Electrical Engineering interview Question and Answers for fresh engineers (Part 6)

Electronics and Electrical Engineering interview Question and Answers for fresh engineers (Part 6)

 In this topic we know about different types of motors starting torque and current, rheostat position, role of armature reaction, stepper motor, KVAR.

 Question: In the synchronous motor, DC motor or Induction motor which types of the motor has the high starting torque and starting current? What are the load criteria for those motors on the starting condition?

Answer:  From these motors the starting torque is present at the DC motor.

The load criteria for the starting conditions are as follows,

·        The DC series motor can not start without the presence of the load.

·        The synchronous motor and Induction motor can not start at the presence of load.

Question:  In the motors starting purpose why the armature rheostats at maximum position while the field rheostat is kept in minimum position? 

Answer:  in the time of starting a motor the field rheostat is kept in minimum state for the high starting torque.

In the time of starting a motor the armature rheostats is used to control or reduce the high starting current. This high starting current can damage the motors starting systems.

Question: What are the types of power in electrical power?

Answer:   There are normally three types of power are counted in electrical power. They are,

·        Apparent power

• Active power
• Reactive power

Question:  What does the KVAR means?

Answer: The KVAR indicates the electrical power. KVAR means

                   “Kilo Volt Amperes with Reactive components”

 Question: In the magnetic fluxes, what is the role of armature reaction?

Answer:  The armature flux plays an important role for the running condition. This armature flux can oppose the main flux or it may support the main flux for better running condition. This effect of supporting and opposing of main flux to armature flux is called armature reaction.

 Question: What do you understand by the two phase motor? Give us one example.

 Answer: The motor which have a phase split in the running and starting winding is called as a two phase motor.

Example: Servo motor is one types of two phase motor. In the servo motor there is phase difference of 90 degree between control winding and auxiliary winding.

 Question:  Define stepper motor. What is the use of stepper motor?

Answer: The motor which work or act on the applied input pulse in it, is called as stepper motor.

This stepper motor is under the category of synchronous motor, which does not fully depend of complete cycle. It likes to works in either direction related to steps. for this purpose it mainly used in automation parts.

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Electrical engineering interview