Electrical Machines A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is 2.2 Ω 1.9 Ω 5.7 Ω 6 Ω 2.2 Ω 1.9 Ω 5.7 Ω 6 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If we increase the rotor reactance value, the maximum torque will decrease None of these not changed increase decrease None of these not changed increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then I1 > I2 I1 = I2 None of these I1 < I2 I1 > I2 I1 = I2 None of these I1 < I2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is 2, 3, 5 1, 4 1, 4, 5 2,3 2, 3, 5 1, 4 1, 4, 5 2,3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Generators work on the principle of production of statically induced emf. dynamically and statically induced emf. dynamically induced emf. None of these statically induced emf. dynamically and statically induced emf. dynamically induced emf. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor is used in grinders? Capacitor start capacitor run IM. Capacitor start IM. Split phase IM. Synchronous motor. Capacitor start capacitor run IM. Capacitor start IM. Split phase IM. Synchronous motor. ANSWER DOWNLOAD EXAMIANS APP
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