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GATE EE 2021 : Electrical Machines Quiz 8 (App update required to attempt this test)
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Question 1
An 8-pole synchronous machine has a synchronous speed of 900 rpm. Determine the frequency of the machine.
Question 2
A 10 kW, 3 ph, 4 pole 50 Hz synchronous motor was working at 50 % full load condition. If supply frequency is changed to 25 Hz and the load is increased to 75 %, the motor will run at a speed of
Question 3
The applied voltage of a certain transformer is increased by 75%, while the frequency of the applied voltage is reduced by 25%. The maximum core flux density will
Question 4
A 450V, 50 KVA 1-ϕ alternator has an effective armature resistance of 0.62 Ω. An excitation current of 10A produces 200A armature current on short circuit and an emf 400V on open-circuit. Calculate synchronous reactance
Question 5
Slip test is gradually used to calculate
Question 6
A 
6-pole alternator is running at 1200 Rpm. The alternator has 144 slots and 10 conductor per slot and having a coil span of 150°. The flux per pole is 0.03 wb. Find the per phase emf generated (in volts) due to 3rd harmonic?
6-pole alternator is running at 1200 Rpm. The alternator has 144 slots and 10 conductor per slot and having a coil span of 150°. The flux per pole is 0.03 wb. Find the per phase emf generated (in volts) due to 3rd harmonic?- 533 attempts
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Oct 11ESE & GATE EE
