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PETROLEUM REFINERY ENGINEERING QUIZ

The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

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A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

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In travelling cranes for swing action which motor is preferred?

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Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

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In a transformer, hysteresis and eddy current losses depend upon

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At stand still condition the value of slip is

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Reluctance and hysteresis motors are the types of which electrical motor?

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A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

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In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

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Ideal value of voltage regulation of a device is?

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