Which among the following safety devices are provided on the power transformers?
A. Marshalling kiosk
B. Vacuum gauge
C. Pressure relief gauge
D. All of these
E. None of these
Which among these systems is an auxiliary plant in a power system?
A. Fuel oil system
B. Raw water system
C. Transformer oil plant
D. All of these
E. None of these
Which among these require a low voltage DC source?
A. Telemetering and communication
B. Uninterrupted power supply
C. The protective relays and the trip circuit
D. All of these
E. None of these
Which circuit among the following requires a supply of 48 V DC source?
A. Trip coils and closing coils
B. Micro wave protection and communication
C. Dc measuring instruments
D. All of these
E. None of these
How is an electrochemical cell rated if ‘n’ cells are connected in series?
A. Ah (ampere hour)
B. n Ah
C. Ah / n
D. nV / Ah
A primary cell is chemically _____________________.
A. Irreversible
B. Reversible
C. Reversible only once
D. Reversible upto five times