NEIEP 400 FINAL EXAM NEWEST ACTUAL EXAM 250 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!!

NEIEP 400 FINAL EXAM NEWEST 2024-2025 

ACTUAL EXAM 250 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!! 

What does the Right - hand Rule for motors determine ? - ANSWER- Direction of the current carrying conductor movement in a magnetic field 

What is the inherent current - limiter present for a rotating motor armature called ? - ANSWER- CEMF 

What effect does the EMF produced through induction have on the applied EMF of a motor armature ? - ANSWER- Opposes the applied EMF 

What does the amount of induced voltage in a wire depend on when moving it through a magnetic field ? - ANSWER- Both B and C 

What is electromagnetism ? - ANSWER- Magnetism generated by current flowing through a coil of wire 

Which of the following elements are present when operating a motor or generator ? - ANSWER- All of the above 

An electromagnetic field in a generator is created by having current flow in the ___? - ANSWER- Coils wound around the pole piece 

What provides the connection for the ends of the armature coils to the commutator ? - ANSWER- Riser 

The pole pieces of a DC Motor are made of many thin layers of iron or steel called ___? - ANSWER- Laminations . 

The neutral plane is ___? - ANSWER- The points in a coil's rotation where zero voltage is induced 

What is the name of the field having only a few turns of heavy wire ? - ANSWER- Series 

What is the result of an improperly balanced armature - ANSWER- Vibration 

What can be used to compensate for armature reaction ? - 

ANSWER- Interpole windings 

Which of the following describes a pole piece's inability to proportionally change its magnetic flux as changes in voltage occur ? - ANSWER- Hysteresis losses 

Which of the following uses a pigtail - ANSWER- Brush 

How many pieces make up the shaft of a DC machine ? - ANSWER- 1 

How is an armature shaft balanced at the factory or repair facility - ANSWER- Adding or removing epoxy weights to the shaft or windings 

Mica is used as a / an ___? - ANSWER- Insulator 

Which of the following is used to lubricate a sleeve bearing ? - 

ANSWER- Oil 

Which of the following is used to lubricate a ball bearing ? - 

ANSWER- Grease 

The frame of a DC Machine is ___? - ANSWER- All of the above 

Which of the following identifies waste currents induced in the core . material of the armature and field pieces ? - ANSWER- Eddy currents 

What does the brush rigging fasten to ? - ANSWER- One of the end bells 

In a separately - excited generator , where does field excitation current come from ? - ANSWER- An external power source 

In a DC series generator - ANSWER- Current flows only when there is a load 

What is the generator series field connected in parallel with ? - 

ANSWER- Shunt field 

How is motor speed changed ? - ANSWER- By varying the field or armature voltage