1
GATE EE 1992
+1
-0.3
The developed electromagnetic force and or torque in electro $$-mechanical energy conversion systems act in a direction that tends A to increase the stored energy at constant$$mmf$$B to decrease the stored energy at constant flux C to decrease the co-energy at constant$$mmf$$D to decrease the stored energy at constant$$mmf$$2 GATE EE 1992 Subjective +5 -0 Figure depicts the load characteristics of an constant speed. Match the following sets of operating conditions with the given characteristics. Disregard the effects of saliency, saturation and stator resistance.$$(a)$$Constant excitation and non-zero leading power-factor$$(b)$$Constant excitation and zero power-factor, leading$$(c)$$Constant terminal voltage and zero power-factor, leading$$(d)$$Constant terminal voltage and non-zero leading power-factor 3 GATE EE 1992 MCQ (Single Correct Answer) +1 -0.3 Neglecting all losses, the developed torque$$(T)$$of$$d.c.$$separately excited motor, operating under constant terminal voltage, is related to its output power$$(P)$$as under A$$T\,\, \propto \,\,\sqrt P $$B$$T\,\, \propto \,\,P$$C$${T^2}\,\, \propto \,\,{P^3}$$D$$T$$independent of$$P$$4 GATE EE 1992 Subjective +5 -0 A separately excited$$d.c.$$motor has an armature resistance of$$0.5ohm.$$It runs off a$$250Vd.c.$$supply drawing an armature current of$$20A$$at$$1,500rpm.$$The torque developed for an armature current of$$10A will be __________ for the same field current.
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