power frequencies
higher frequencies entering generator or transformer units
either of the above
none of the above
Answer is Right!
Answer is Wrong!
Switchgear protections
52. Circuit breakers are essentially
current carrying contacts called electrodes
arc extinguishers
circuits to break the system
transformers to isolate the two systems E. any of the above
Answer is Right!
Answer is Wrong!
53. SF6 gas
Is yellow in colour
Is lighter than air
Is nontoxic
Has pungent small E. None of the above
Answer is Right!
Answer is Wrong!
54. Induction cup relay is operated due to changes in
current
voltage
impedance
all of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionInduction cup relay is operated due to changes in
55. The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
recovery
surge
operating
arc E. none of the above
Answer is Right!
Answer is Wrong!
56. A fuse is connected
in series with circuit
in parallel with circuit
either in series or in parallel with circuit
none of the above
Answer is Right!
Answer is Wrong!
57. Overload relays are of type.
induction
solid state
thermal
electromagnetic E. all above
Answer is Right!
Answer is Wrong!
58. The delay fuses are used for the protection of ________ .
motors
power outlet circuits
fluorescent lamps
light circuits
Answer is Right!
Answer is Wrong!
Detailed SolutionThe delay fuses are used for the protection of ________ .
59. Discrimination between main and back up protection is provided by the use of relays which are
fact
sensitive
slow
none of the above
Answer is Right!
Answer is Wrong!
60. Fault diverters are basically
fuses
relays
fast switches
circuit breakers
Answer is Right!
Answer is Wrong!