AP Class 12 Model Paper 2027 Electrical Technician

ELECTRICAL MACHINES AND POWERSYSTEMS
SECOND YEAR: THEORY PAPER-I

NOTE: ) Answer any FIVE questions.

1 State the different types of D.C. Generator.
2. Write the working principle ofD.C. Motor.
3. Define the terms Form factor and Peak factor of an
alternating quantity.
4. State the different losses occurred in Transforme.
5. Define Voltage Regulation ofan alternator.
6. State the applications of Three phase slip-ring induction
1
motor.
Write the applications of Stepper motor.
Write different types of Conventional energy
sources.
9 State the different type of equipment's used at substations.
10. Expand the following terms.
(a) ACSR (b) HG (c) PSCC (d) OCB.

NOTE: () Answer any FIVE questions.
(ii) Each question carries SIX Marks.
5 x6= 30

11. An 8-Pole DC Generator has 960 conductors and
flux per pole 20 milli Weber and running at 1000rpm.
Calculate the EMF generated in LAP and WAVE winding.
12. Explain the working of Three-Point starter witha neat sketch.
13. Write the advantages ofPoly Phase Systems over
Single phase systemns in six aspects.
14. Explain OC and SC test on a single Transformer.
15. (a) State any three advantages of an alternator.
(b) Draw the single line diagram ofPower System.
16. Draw and explain the working of a STAR/DELTA
starter.
17. Explain the operation of Single Phase Induction Motor.
18. Explain the working of"Thermal Power station with a neat
sketch.

DOMESTIC APPLIANCESAND REWINDING
SECOND YEAR:THEORYPAPER-II
Max, Marks: 50

1. State the different types of Tools required for dismantlingof Electrical domestic appliances.
2. Name the main parts ofElectrical Mixer.
3. State the different types ofPump sets.
4. Write the different types of ElectricLamps.
5. Draw the wiring circuit ofFluorescent tube light.
6. What are the tests to be done before proceeding for Rewinding?
7. Name the different insulating materials used while rewinding of amachine.
8 Define the term Front Pitch in a DC Machine.
9. Write the types ofAC windings.
10. What are the defects in Universal Motor?

NOTE: () Answer any FIVE questions. 5 x6=30
Marks,
(ii) Each question carries SIX

Domestic appliances.
11. (a) Classify the different types of Electrical
Hair Dryer.
(b) State the faults and remedies in
Explain the working of Electric Iron with
a neat sketch.
12.
neat sketch.
13. Explain the construction of an Electric Geyser with a
14. Explain the working ofCeiling fan.
Explain the working of Servo Voltage Stabiliser with
a neat sketch.
15.
16. Explain the General procedure for rewinding of amachine.
DC generator having 24 slots.
17. Draw and develop the single layer LAP winding diagram for 4-pole
induction motor.
18. Explain the procedure for servicing of athree phase

ELECTRICAL ESTIMATION AND UTILISATION
SECOND YEAR: THEORY PAPER -II

(ii) Each question carries FOUR Marks. 5 x 4 = 20

1 What are the different types of starters used for AC Motor?
2 State the power rating limitations in a sub circuit.
3. Define SAG.
4. What are the different types of Insulators used in Over Headlines?
5. Define Substation.
6. State the different lighting methods used in auditorium.
7. What are the Major Components in a Public address system?
8. Write any two IE rules employed in an internal wiring system.
9. What is meant by Quotation?
10. Define Space-Height ratio.

(ii) Each question carries SIX Marks. 5x6= 30

11. Explain the General rules for wiring.
12. Estimate the quantity of materials and its costs for a conduitwiring system in a house of
size 6mx 5m
x3 m. Assume any missing data. Provide one power socket at each hall.
13. Draw and estimate the materials required for Installation of an agriculture
Motor with 5 HP. 440 Volt and
50 Hz three phase motor.
14. A11 KVhree phase OH line is to be layed for 3KM's length with PSCC
poles with a span of 50Metres.
Prepare the estimation of materials required.
15. Prepare an estimation of materials for a Pipe earthing system.
16. Estimate the quantities of materials and its costs for PA system to be provided in an
30 m x 15 m. Assume any missing data. Assembly hall of size
17. (a) Explain the polarity test of a single pole switch.
(b) State the Laws ofIllumination.
18. Draw the connection diagram ofNEON sign board for ELECTRICAL.