PRE – LAB HOMEWORK

FOUR SEMESTER

ELECTRICAL ENGINEERING

ELECTRICAL MACHINES

Engr. MUHAMMAD IDREES

ELECTRICAL MACHINES LAB

DEPARTMENT OF ELECTRICAL ENGINEERING

Federal Urdu University of Arts, Science & Technology

PRE-LAB HOMEWORK

Lab No. 2

LOAD CHARACTERISTICS OF A DC SHUNT MOTOR

What is Dc Shunt Motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Write Dc Shunt Motor Formulas?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe Motor Load?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe CEMF?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 3

LOAD CHARACTERISTICS OF A DC SERIES MOTOR

What is Dc Series Motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Write Dc Series Motor Formulas?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe Motor Load?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe Motor Speed?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 4

EFFICIENCY AND LOSSES OF A DC MOTOR

What is Input Power of a DC Motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

What is Output Power of a DC Motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe the Losses of a Dc motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

What is the Efficiency of a DC Motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 5

MOTOR SPEED AND COUNTER EMF

Describe Motor Speed?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe CEMF?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

How increase DC Shunt Motor Speed?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

How increase DC Series Motor Speed?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 6

LOAD CHARACTERISTICS OF DC COMPOUND GENERATOR

What is a Generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

What is a DC Compound Generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Write the Formulas of a DC Generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe Generator Load?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 7

COPARISON BETWEEN A CUMULATIVE GENERATOR AND A DIFFERENTIAL GENERATOR

What is Difference between Cumulative and Differential Generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 8

SPEED AND OUTPUT CHARACTERISTICS OF A COMPOUND GENERATOR

What are output characteristics of a compound Generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 9

EFFICIENCY AND LOSSES OF A COMPOUND GENERATOR

What is efficiency of compound generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Efficiency Formulas?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe losses of a DC generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 10

DISECTION OF MACHINES

(Multifunction Electrical Machines Model A4300)

Describe the various parts of motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe the various parts of generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe the various parts of commutator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 11

OPERATION OF MACHINES (Multifunction Electrical Machines Model A4300)

Describe the operation of motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

Describe the operation of generator?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 13

DELTA –Y CONNECTIONS OF A TRANSFORMER

Describe Delta connection of a transformer?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe Y connection of a transformer?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

Describe Delta connection of a transformer?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 14

MOTOR SPEED & INPUT CHARACTERISTICS

How can affect input to motor speed?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

How can affect motor speed?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

What are input characteristics of a motor?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

PRE-LAB HOMEWORK

Lab No. 16

CLOSE LOOP MOTOR SPEED CONTROL TECHNIQUE

Define feedback?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

What is difference between close loop and open loop circuit?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.

How we can control motor speed by control system?

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

__________________________________________________________

_________________________________________________________.