Electrical Machines What is the highest possible speed of turbo alternators? 1000 rpm 1500 rpm 4000 rpm 3000 rpm 1000 rpm 1500 rpm 4000 rpm 3000 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases? Increases. Remain unchanged None of above. Decreases. Increases. Remain unchanged None of above. Decreases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be 3.1 Ω 1.8 9 Ω 2 .1 Ω 1.79 Ω 3.1 Ω 1.8 9 Ω 2 .1 Ω 1.79 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses? 2KW 1.5KW 3KW 0.5Kw 2KW 1.5KW 3KW 0.5Kw ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm 0.23Ω. 0.25Ω. 0.5Ω. 1Ω. 0.23Ω. 0.25Ω. 0.5Ω. 1Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with constant V, Tst increases None of these constant supply voltage V, starting torque Tst decreases either of these constant V, Tst increases None of these constant supply voltage V, starting torque Tst decreases either of these ANSWER DOWNLOAD EXAMIANS APP
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