DGVCL Exam Paper (12-06-2016) Which of the following circuit breakers has high reliability & minimum maintenance? Air blast CB Bulk oil type CB Vacuum CB Sulphur hexafluoride CB Air blast CB Bulk oil type CB Vacuum CB Sulphur hexafluoride CB ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) In a transformer the energy is conveyed from primary to secondary Through air None of these Through cooling coil By the flux Through air None of these Through cooling coil By the flux ANSWER EXPLANATION DOWNLOAD EXAMIANS APP function of transfomer is that transfer electrical energy from primary cicuit to secondary through magnetic cicuit by mutual induction
DGVCL Exam Paper (12-06-2016) A 17 inch personal computer uses approximately 150 watts in an hour. If you have same computer on for only 4 minutes (for checking e-mail) what would be the power consumption? None of these 0.1 kW 0.01 kW 0.04 kW None of these 0.1 kW 0.01 kW 0.04 kW ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) _____ are used where it is necessary to control a circuit by a low power signal. Transformer Relays Electric Motor None of these Transformer Relays Electric Motor None of these ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) For a 66 kV line having span of 200 meters between towers the approximate sag will be 2 m. If the span is double the sag will be: 1 m 2 m 8 m 4 m 1 m 2 m 8 m 4 m ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: Current will be too much high No effect Eddy Current and Hysteresis losses will be excessive Transformer may start to smoke and burn Current will be too much high No effect Eddy Current and Hysteresis losses will be excessive Transformer may start to smoke and burn ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Core loss of transformer = Hysteresis loss + eddy current lossHysteresis loss prpotional to feddy current loss prpotional to f².
EXAMIANS