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Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively
14.28 and 5.54 Ω.
8.248 and 5.54 Ω.
8.248 and 9.60 Ω.
14.28 and 9.60 Ω.
14.28 and 5.54 Ω.
8.248 and 5.54 Ω.
8.248 and 9.60 Ω.
14.28 and 9.60 Ω.
Answer
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Related Question
Electrical Machines
With the increase in speed of DC motor
Both back emf as well as line current fall.
Back emf falls and line current increase.
Both back emf as well as line current increase.
Back emf increase but line current falls.
Both back emf as well as line current fall.
Back emf falls and line current increase.
Both back emf as well as line current increase.
Back emf increase but line current falls.
Answer
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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift
increases in both the generators and the motors with load.
increases in generators but decreases in motor with load.
decreases in both generators and the motors with load.
decreases in generators and increases in motor with load.
increases in both the generators and the motors with load.
increases in generators but decreases in motor with load.
decreases in both generators and the motors with load.
decreases in generators and increases in motor with load.
Answer
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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be
R2 = s2X2.
sR2 = X2.
R2 = sX2.
R2 = s2X2.
R2 = s2X2.
sR2 = X2.
R2 = sX2.
R2 = s2X2.
Answer
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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be
1000 rpm
2000 rpm
500 rpm
250 rpm
1000 rpm
2000 rpm
500 rpm
250 rpm
Answer
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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will
Remain unaltered.
Oscillate around the normal speed.
Increase.
Reduce.
Remain unaltered.
Oscillate around the normal speed.
Increase.
Reduce.
Answer
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