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GATE 2019: Electrical Machines Quiz 1
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Question 1
A 4 pole induction machine is working as an induction generator. The generator supply frequency is 60 Hz. The rotor current frequency is 5 Hz. The mechanical speed of the rotor in RPM is
Question 2
The emf induced in a conductor of machine driven at 600 rpm, the peak value of flux density is 1 Wb/m2, diameter of machine 2 m and length of machine 0.3 m is ______ V.
Question 3
A 6 – pole alternator with 36 slots carries a 2 – phase distributed winding. Each coil is short pitched by one slot. Then determine the value of distribution factor?
Question 4
A 30 kW 3-phase motor, operating at 415 Volt, with efficiency of 85% and power factor 0.85 is connected to the feeder line. What is the approximate value of full load current?
Question 5
A 20-pole alternator is having 180 identical stator slots with 6 conductors in each slot. All the coils of a phase are in series. If the coils are connected to realize single-phase winding, the generated voltage is 
If the coils are reconnected to realize three-phase star-connected winding, the generated phase voltage is 
Assuming full pitch, single-layer winding, the ratio 
is
Question 6
A 4 pole DC generator lap wounded has 240 coils of 2 turns each. Resistance of one turn is given as 0.05 ohm. Length and diameter of armature coil are 50cm and 40 cm respectively. Each pole subtends 600 mechanical angle. Air gap flux density is uniform over pole shoe measured as 0.4 T. Rated speed of DC generator is given as 1200 rpm. If rated armature current is given as 20 A, What will be the terminal voltage (in volt) of DC machine?
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Nov 7ESE & GATE EE
