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GATE EE : Electrical Machines Champion Quiz 2
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Question 1
For a specified input voltage & frequency, if the equivalent radius of the core of a transformer is reduced by half, the factor by which the number of turns in the primary should change to maintain the same no-load current is ?
Question 2
A 1.8 ° step, 4-phase stepper motor has a total of 40 teeth on 8 poles of stator. The number of rotor teeth for this motor will be
Question 3
A coil of 1000 turns is wound on a core. A current of 1 A flowing through the coil creates a core flux of 1 mWb. What is the energy stored in the magnetic field?
Question 4
An elementary cylindrical machine has one full-pitch coil in the stator, but the rotor may have (i) two poles or (ii) four poles of permanent magnets. The time-varying voltage that could be induced in the stator coil for one rotation of the rotor, while the rotor is revolving at a constant speed are shown in the figures A, B, C and D below.
A)
B)
C)
D)
Select the correct combination from the code given below:
2-Pole 4-pole
A)
B)
C)
D)
Select the correct combination from the code given below:
2-Pole 4-pole
Question 5
What is the power transmitted inductively in an auto-transformer which supplies a load at 161 volts with an applied primary voltage of 230 volts?
Question 6
In an Autotransformer design shown, the secondary voltage is generated on winding side. The current flowing out of winding is:
Question 7
The resistance and reactance of a 100 kVA, 11000/400V, Δ - Y distribution transformer are 0.02 p.u. and 0.07 p.u. respectively. The phase impedance of the transformer referred to the primary is
Question 8
A 50 kVA, 3300/230 V single-phase transformers is connected as an autotransformer shown in figure. The nominal rating of the autotransformer will be
Question 9
A 200/400 V, 50 Hz, two-winding transformer is rated at 20 kVA. Its windings are connected as an auto-transformer of rating 200/600 V. A resistive load of 12 Ω is connected to the high voltage (600 V) side of the auto-transformer. The value of equivalent load resistance (in Ohm) as seen from low voltage side is _____.
Question 10
In an auto-transformer, power is transferred, through
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Jun 29ESE & GATE EE
