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Statement for Linked Answer Questions :
A synchronous motor is connected to an infinite bus 1.0pu voltage and draws 0.6 pu current at unity power factor. Its synchronous reactance is 1.0pu and resistance is negligible.[1] The excitation voltage (E) and load angle (δ) will respectively be
[2 marks]
(A) 0.8 pu and 36.86° lag
(B) 0.8pu and 36.86° lead
(C) 1.17 pu and 30.96° lead
(D) 1.17 pu and 30.96° lag[2] Keeping the excitation voltage same, the load on the motor is increased such that the motor current increase by 20%. The operating power will become
[2 marks]
(A) 0.995 leading
(B) 0.995 lagging
(C) 0.791 lagging
(D) 0.848 leadingasked in Electrical Engineering, 2008
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180.
Statement for Linked Answer Questions :
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80rad/s. The armature resistance is 0.5 Ω and the field winding resistance is 80 Ω.[1] The net voltage across the armature resistance at the time of plugging will be
[2 marks]
(A) 6 V
(B) 234V
(C) 240 V
(D) 474 V[2] The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is [2 marks]
(A) 31.1 Ω
(B) 31.9 Ω
(C) 15.1 Ω
(D) 15.9 Ωasked in Electrical Engineering, 2008
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