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BARC 2018 EE: Electrical Machines Nuclear Quiz 1
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Question 1
A single phase transformer with secondary voltage of 230V, 50Hz delivers power to load R= 10Ω through a half wave controlled rectifier circuit. For a firing angle delay of 60 ° Rectification efficiency of the rectifier is –
Question 2
A single phase 60 Hz generator supplies an inductive load of 2000kW at a power factor of 0.404 lagging by means of an overhead transmission line 30 km long. The line resistance and inductance are 0.0122 ohm and 0.35 mH per km. The voltage at the receiving end is required to be kept constant at 8 kV. Find voltage regulation in Percentage (%) of the line.
Question 3
A DC generator has a useful flux of 0.05 Wb per pole. It has 8 lap connected poles and has 600 conductors on the armature. It runs at a speed of 1200 rpm. Find the EMF generated and the speed required if same connections are made using wave winding?
Question 4
The stator of a 3- phase, 4 – pole AC machine has 48 slots. The stator winding has 48 coils with a coil span of 6 slots. Which type of winding is suitable for this type of machine –
Question 5
A 75 kW, 250 V compound dc generator has the following data:
Brush contact drop, 
(1 Volt each brush).
_____ is the ratio of generator induced emf when fully loaded in long shunt compound and short shunt compound.
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Apr 25ESE & GATE EE
