DIPLOMA IN ELECTRICAL AND ELECTRONICS
ENGINEERING
SUBJECT CODE :
23032
SEMESTER : III SEMESTER
SUBJECT
TITLE : ELECTRICAL MACHINES-I
STAFF-IN-CHARGE : N.SURESH KUMAR
IMPORTANT
QUESTIONS
UNIT-I
PART-A
1.
Define
Absolute and relative permeability-April
2013
2.
Define
Ampere Turn (A.T)-April 2013
3.
State
Len’s Law-Apr 2013-April 2014-April 2015
4.
Compare
any two factors between Magnetic and Electric circuit
5.
Define
Magnetic flux (Φ)-Oct 2012-Oct 2014
6.
State
Laws of Magnetic Force (F)-Oct 2012-Oct
2013
7.
State
Fleming’s Left Hand Rule-April 2014
8.
Explain
Mutual Induction
9.
Define
Intensity of Magnetization -Oct 2012
10.
State
Fleming’s Right Hand Rule-Oct 2012-April
2013-Oct 2013
11.
Define
Reluctance –Oct 2013
12.
Write
the expression for lifting power of Electromagnet-Oct 2013
13.
Define
flux density-April 2014
14.
Write
expression for energy stored in magnetic field-April 2014
15.
Define
magnetic field intensity-Oct 2014
16.
Derive
the Expression of Hysteresis loss-Oct
2014
17.
What
is mutually induced emf-Oct 2014
18.
What
is magnetic material –April 2015
19.
Write
any one application of electromagnet-April
2015
20.
What
are two induced emf-April 2015
PART-B
1.
Write
short notes on the following:
Hystersis
Losses & Eddy Current Losses (6) (12)- April
2014-April 2015
2.
Explain
statically Induced EMF with neat diagram (6)-April 2014
3.
Derive
force on a current carrying conductor lying in a Magnetic field. (6)- oct 2012
4.
Define Magnetic field strength (H), flux
density (B), Intensity of Magnetization (I) (6)-April 2013
5.
Derive
Lifting Power of Electro magnet (6)-April
2014
6.
Explain dynamically induced emf.(12)
(6)- Oct 2013-April 2015
7.
Explain self induced emf (6) – oct 2012
8.
Compare magnetic and electric circuits
(6)-April 2013-Oct 2013-April 2015
9.
Faraday’s law of electromagnetic
induction (6)-Oct 2014
10.
Explain the significance of hysteresis
loop of a magnetic specimen (6)-Oct 2014
UNIT-II
PART-A
1.
What
is Lap winding?-Oct 2012
2.
What
is the condition for self excitation?-April
2013
3.
Draw
the circuit for DC series Generator
4.
State
any two application of compound generator-April
2013
5.
What
is wave winding?-April 2013
6.
Explain
separately excitation
7.
Define
Back pitch and Front pitch
8.
What
is an Armature?
9.
What
is the function of commutator in DC generator-Oct 2014
10.
Define
critical field resistance in Dc generator-Oct
2014
11.
What
is the function of brush-Oct 2014
12.
What
are the methods used to compensate armature reaction in DC generator?-Oct 2014
13.
Where
to use lap winding?-Apr 2014
14.
Mention
any two losses in Dc generator.-Apr 2014-Oct
2013
15.
Draw
the load characteristics curve of Dc shunt Generator.-April 2014
16.
Define
armature reaction-April 2014
17.
Mention
any two applications of Dc generator.-Oct
2013-Oct 2012
18.
Mention
the purpose of doing Swimburne’s test-Oct
2013
19.
Write
the expression for emf equation in DC machines-Oct 2013
20.
Mention
the types of armature winding in Dc Machines-Oct 2013
21.
Name
the various parts of Dc generators.-Oct
2012
22.
Write
the expression for Dc generator-Oct 2012
23.
What
is separately excited DC generator-Apr
2015
24.
What
is the internal characteristics of DC Generator?-April 2015
25.
List
the methods to compensate the armature reaction-April 2015
PART-B
1.
Drive
EMF equation of a DC Generator (6) – Oct
2012-April 2013-April 2014-April 2015
2.
Explain
Load Characteristics of a DC shunt Generator (6)-Oct 2013
3.
Explain
the 3 components of a DC Machine Field System,Commutator,Yoke(6)-Oct 2014
4.
Explain
constructional details of a DC Generator (12)-April 2014-April 2015
5.
Explain an Armature reaction with neat
diagram (12)-Oct 2012-Oct 2013-April
2014-April 2015
6.
Methods of compensation of Armature
reaction (6)-April 2013-Oct 2013
7.
Develop the winding diagram for 24 slots
4 poles 4 poles single layer lap winding (6) – april 2013
8.
Explain the working principle of DC
Generator (6)-Oct 2013
9.
Types of DC Generator (6)-Oct 2013
10.
No-load characteristics of DC Shunt
Generator (6)-April 2014
UNIT-III
PART-A
1.
Draw
the Speed-Torque curve of a DC series Motor-April 2014
2.
What
are the Speed Control factors?
3.
Draw
the circuit diagram of a DC series Motor
4.
Write
any 2 application of DC Shunt Motor
5.
Define
Back emf.-Oct 2013-April 2015
6.
Write
the Torque equation of a DC Motor-Oct
2012-April 2014-Oct 2014
7.
Explain
Critical Resistance
8.
State
any two applications for a DC series motor-Oct
2013
9.
What
is the principle of DC Motor?-Oct 2012
10.
Write
the power stages of DC Motor.-Oct 2012
11.
State
which type Dc Motor is suitable for (i) Centrifugul pump (ii) Electric trains-Oct 2012
12.
Write
the expression for back emf in DC Motor-April
2013
13.
What
are the three points of DC shunt Motor starter?-April 2013
14.
What
are the factors which control Dc Motor speed?-April 2013
15.
What
are the applications of DC Compound motor?-April
2013
16.
Mention
the two methods of Dc motor control.-Oct
2013
17.
What
is called commutation?-Oct 2013-Oct 2014
18.
Write
the expression for torque equation in Dc Motor-April 2014
19.
What
is the necessity of starters?-April
2014-Oct 2014
20.
What
are the different losses occurring in Dc motor?-Oct 2014
21.
Mention
the types of starters used in DC Motor-April
2015
22.
Dc
series motor is preferred for traction purpose why?-April 2015
23.
Name
the two protective devices used in three point starter.-April 2015
PART-B
1.
Explain
working principle of operation of DC Motor (6)-Oct 2012-April 2014-April 2015
2.
Develop
the Torque equation of the DC Motor (6)-Oct
2012-Oct 2013-Oct 2014
3.
Explain
commutation with neat diagram. (6)-April
2014
4.
Explain 3 point starter with neat
diagram (6)-Oct 2013-April 2015
5.
Explain Armature control and field
control method (12)-Oct 2012-Oct 2013
6.
Explain 4 point starter with a neat diagram
(12)-April 2014
7.
Types of DC motor and voltage equations
(6)-April 2013
8.
Explain Armature torque and shaft torque
(6) –April 2013
9.
Characteristics of Dc shunt motor (6)-Oct 2013
10.
Explain the char of compound
generator(6) –Oct 2014
11.
Different field control methods of Dc
Series motor (6)- Oct 2014
12.
Load test on DC compound motor (6)-Oct 2014
13.
Explain how the speed is controlled in
DC Shunt motor by armature and field control methods.(6)-April 2015
14.
What are the methods of improving commutation
in Dc motor? (6)-April 2015
UNIT-IV
PART-A
1.
Why
transformer rating is always in KVA?-Oct
2012
2.
Draw
No Load Vector Diagram of a Single Phase Transformer.-April 2013
3.
What
is the condition for Maximum efficiency?-Apr
2013
4.
Write
any two advantages of Parallel Operation
5.
Define
Voltage transformation ratio-Oct 2014
6.
Define
Regulation-Oct 2012
7.
What
is Auto transformer?-Oct 2012
8.
What
are the conditions for 2 single phase transformer parallel?
9.
On
what principle does the transformer works?-April
2015
10.
State
the different connections of three phase distribution transformer-April 2015-Oct 2012
11.
Mention the use of breather in transformer-April 2015-Oct 2013
12.
What
are the two test to find losses in transformer?-April 2015
13.
What
is all day efficiency of transformer?-Apr
2013-Oct 2013-Oct 2014
14.
Mention
the use of breather in transformer.-Apr
2013
15.
Write
the expression for emf equation of 1 phase transformer-Oct 2013
16.
What
is the purpose of doing SC test in transformer?-Oct 2013
17.
Mention
the two no load current component.-April
2014
18.
Mention
any one condition of parallel operation of transformer-April 2014
19.
Mention
two methods of connection of 3 phase transformer.-April 2014
20.
What
are the advantages of parallel operation of transformer?-Oct 2014
21.
Mention
the use of Buckholz relay.-Oct 2015
PART-B
1.
Explain
working principle of Transformer (6)-Oct
2012
2.
Explain
open circuit test with neat diagram(6)
3.
Write
about any two 3 phase transformer connection (6)
4. Write
short notes about Buckholz relay (6)-Oct
2012-April 2014-April 2015
5. Explain
Auto Transformer and also write advantages and disadvantages (12)-Oct 2013-Oct 2014-April 2015
6. Write
short notes on Load & Off Load Tap changes(12)-oct 2013
7. Explain
EMF equation of transformer (6)-April
2013
8. Derive
the condition for maximum efficiency of a Transformer (6)-April 2013-Oct 2014
9. Necessity
of tap changing in a distribution transformer (6)-April 2013
10.
Equivalent circuit of single phase
transformer (6)-Oct 2013
11.
Explain 4 Cooling methods of transformer
(6)-Oct 2013-April 2014-April 2015
12.
Vector diagram of transformer on load
with lagging power factor (6)-April
2014-Oct 2014
13.
Write short notes on All day Efficiency
(6)-April 2014
14.
Construction of Shell type transformer
with advantage and disadvantage (6)-Oct
2014
15.
Draw and explain the phasor diagram of
transformer in leading power factor load.-April
2015
UNIT-V
PART-A
1.
What
is the use of Silica Gel in Breaker?
2.
Define
Secondary Battery-April 2015
3. What are the
indications of fully charged cell for Lead Acid Battery?-April 2015
4.
What
is the function of Brush?-Apr 2013
5.
State
Faraday’s Law Electrolysis.-oct 2013
6.
What
is the active material used in Nickel – Iron cell?
7.
What is specific gravity of H2 SO4?
8.
What
is the electrolyte in lead acid cell?-April
2015
9.
Write
any three application of Alkaline Battery.-April
2015-Apr 2013
10.
What
is primary cell?-Oct 2014-Apr 2013
11.
Define
Ampere-hour efficiency-Oct 2014-Apr 2013
12.
What are the requirement of brushes-Oct 2014
13.
Name
three causes of sparking in commutators.-Oct
2014-Oct 2012
14.
What is primary battery?-Apr 2014
15.
Mention
any two types of brushes-Apr 2014
16.
Mention
any two types of resurfacing commutator-Apr
2014
17.
Mention
two applications of lead acid cell-Apr
2014
18.
What
is the function of brush holder?-Oct
2013
19.
What
is the use of growler?-Oct 2013
20.
Compare
lead and Edison cell with respect to positive plates-Oct 2013
21.
Define
secondary cells.-Oct 2012
22.
What
is the active materials used in Nickel iron cell?-Oct 2012
23.
What
is meant by trickle charging?-Oct 2012
PART-B
1.
Write
common causes of sparking in commutators (6)-April 2014-Oct 2013-Apr 2013
2.
Explain
Staggering of Brushes (6)-Oct 2014-Oct
2013
3.
What
are Maintenance of Lead Acid Cell (6)
4. Compare
Lead Acid and Edison Cell (6)-Oct
2014-Oct 2012
5. Explain
Growler with neat diagram (12)-Oct
2014-Apr 2014-Oct 2012
6. Construction
of Nickel iron cell (6)-Oct 2014-Oct
2012
7. Compare
primary and secondar5y Batteries (6)-Apr
2014
8. Explain
the two methods of charging storage batteries (6)-Apr 2014
9. How
to find defects in armature windings (6)-Oct
2013
10.
Construction of lead acid cell (6)-Oct 2013-Apr 2013
11.
Explain the functions and requirements
of Brushes (6)-Apr 2013.
12.
Explain Faradays law of Electrolysis
(6)-Apr 2013
13.
What are the Common effects of
commutator? How they are rectified? (6)-Oct
2012
14.
Explain how the faults can be located by
conducting voltage drop test (6)-April
2015
15.
Enumerate the electrical characteristics
of Edison cell (Nickel - Iron) (6)-April
2015
16.
Explain the chemical reactions and
physical changes during discharging and charging of lead acid cell (6)-April 2015
17.
What is resurfacing of commutator?
Explain any two methods of resurfacing.-April
2015
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