Union Public Service Commission (UPSC) conducts various examinations every year for different fields. UPSC examinations are the highly competitive level exam papers which are to be prepared at the best possible level. UPSC Engineering Services Exam or ESE Electrical II papers are the important study plan for the exam. Download UPSC ESE Electrical Previous Year Question Papers both general & conventional type. These will help you to know what kind of questions come in exam generally and accordingly the exam preparations can be done.
A 200/ 100 V, 50 Hz transformer is to be excited at 40 Hz from the 100 V side. For the exciting current to remain same, the applied voltage should be
- 150 V
- 125 V
- 100 V
- 80 V
A single phase two winding transformer is designed to operate 400/ 200 V, 50 Hz. If the h.v side is now energized from 400v, 40 Hz source, the no-load l.v side voltage would be
- 300 V
- 250 V
- 200 V
- 150 V
A 100 VA, 120/ 12 V transformer is to be connected so as to form a step-up transformer. A primary voltage of 120 V is applied to transformer. What is the secondary voltage of the transformer?
- 1.2 V
- 12 V
- 120 V
- 132 V
If the percentage impedances of the two transformer working in parallel are different then
- Transformers will be overheated
- Power factors of both the transformers will be same
- Parallel operation will not be possible
- Parallel operation will still be possible
In a transformer, if the iron losses and copper losses are 40.5 kW and 50 kW respectively, then at what fraction of load will the efficiency be maximum?
Same as above, there are many questions which have been asked in the exam. The type of questions may or may not differ in the exam. For this download the set of old papers for UPSC ESE Electrical II and practice them for best scores in exam.
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