Electrical Machines The heat transfer by convection in a transformer least depends on color of the paint. temperature difference. air velocity. surface area. color of the paint. temperature difference. air velocity. surface area. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is 1. 0.8. 0.4. 0.6. 1. 0.8. 0.4. 0.6. 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 1.79 Ω 2 .1 Ω 1.8 9 Ω 3.1 Ω 1.79 Ω 2 .1 Ω 1.8 9 Ω 3.1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Tap changer is generally provided in earthing transformer. current transformer. voltage transformer. power transformer. earthing transformer. current transformer. voltage transformer. power transformer. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is ineffective. demagnetizing. cross – magnetizing. magnetizing. ineffective. demagnetizing. cross – magnetizing. magnetizing. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the handle of a three point starter goes to back to OFF position, it may be due to all of these. zero or very low voltage supply. over load. high filed circuit resistance. all of these. zero or very low voltage supply. over load. high filed circuit resistance. ANSWER DOWNLOAD EXAMIANS APP
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