[amp_mcq option1=”Two sharp whistles” option2=”One long one short.” option3=”On long” option4=”None of these” correct=”option1″]
The correct answer is A. Two sharp whistles.
The driver must give two sharp whistles if he does not receive the all-right signal from the guard. This is to alert the guard that there is a problem and that the train should not proceed.
Option B is incorrect because one long whistle is the signal to proceed. Option C is incorrect because one long whistle is the signal to stop. Option D is incorrect because it is not a valid option.