In the past helicopters are forced to ground or crash because of the formation of the ice on the rotors and engines. A new electronic device has been developed which can detect the water content in the atmosphere and warns the pilot if the temperature is below freezing temp about the formation of the ice on the rotors and wings.

1.False (The e device is onli used to detect, does not avoid the formation of ice )2.True (That is why they were not allowed to fly )3.4. Can't say (There may be many other devices also)

1> The electronic device can avoid formation of the ice on the wings : (True/False/Can't Say)2> There will be the malfunction of rotor & engine because of formation of ice : True3> The helicopters are to be crashed or down : Can't Say4> There is only one device that warn about the formation of ice : Can't Say.(There may be more than one)