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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - delta
 Star - delta
 Delta - star

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.4
 0.02
 0.2
 0.04

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Electrical Machines
Resistance commutation is used generally in case of

None of these
 DC machines above 10 kW.
 DC machines bellow 5 kW.
  fractional kW DC machines.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 decrease and increase respectively
 both increase
 both decrease
 increase and decrease respectively

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 301 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A
 primary = 602 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A

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Electrical Machines
Tappings of a transformer are provided

 at the neutral side end of hv side
 at the middle of hv side
 at the phase end of lv side
 at the phase end of hv side

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