F F2801 ‏کہا‎ മട
54 2 oe

0) A star connected balanced three phase 1௦80 of (1 0+j 10) @

स ao gs”

(is supplied from a star (8)
connected balanced three phase supply with Vin = 10073 20° V. Two single phase
wattmeters are connected to measure three phase power.

Determine: -i) Wattmeter readings of Wa and (11) Three phase real power
111) Three phase reactive power
16 With neat sketches, describe the main components of a nuclear power plant. (10)
MODULE 5
Answer any one full question, carries 10 marks.
17 2) 1109 back emf is generated in a DC motor? What is the significance of back emf? (3)

b) With electrical circuit diagram, give detailed description of various types of (7)
DC motors. Elaborate the characteristics of each type.
OR
18 a) A 200 kVA rated transformer has a full-load copper loss of 1.5 kW and an iron (6)
loss of 1 kW. Determine the transformer efficiency at full load and 0.85 power

factor.
b) How hysteresis and eddy current losses are minimized in a transformer? (4)
MODULE 6
Answer any one full question, carries 10 marks.
19 a) Define the terms: (4)

i) synchronous speed ii) slipiii) slip speediv) rotor speed.
b) A 3-phase 50Hz induction motor has a full load speed of 960 rpm. (6)
Find the:
i) Slip
ii)Number of poles
iii)Frequency of rotor induced emf
iv) Speed of rotor field with respect to rotor
v) Speed of rotor field with respect to stator
vi) Speed of rotor field with respect to stator field.

OR
20 a) List out any four types of single phase induction motors. (2)
b) Write down the constructional details and working of capacitor start induction (8)

motor. Draw relevant phasor diagram.

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