If a wire conductor of resistance 0.4O is doubled in length, its resistance becomes :
(a) 0.4 O
(b) 0.8 O
(c) 0.2 O
(d) 0.1 O
(b) 0.8 O
(c) 0.2 O
(d) 0.1 O
Top 30 Electrical Switchgear & Protection Interview Questions with Answers PDF
Real Time Electrical Switchgear & Protection Interview Questions with Answers PDF 1. What are the main functions of control gear? 1. To provide a means of starting and stopping the motor and, at the same time, of limiting the starting current if required. 2. To give adequate protection to the motor under all conditions. 3. To allow speed changing when required. 4. To provide means of braking the motor when required. 5. To reverse the direction of rotation when required. Protection of the motor must be automatic, but the other operations may be arranged to be under the control of an operator, or may be partly or fully-automatic. 2. What provision must be made for short-circuit conditions in motor circuits? Since overload relays are not designed to operate and clear the circuit in the event of a short-circuit. Circuit-breaker or fuse protection of suficient breaking capacity to deal with any possible short-circuit that may occur must be provided. 3. What are the usual forms of overlo...
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