Interview Exam General Ability

Suppose you don't know long form CFL but someone show you a CFL lamp & ask is it CFL or CLF ? then how do you explain ?

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Interview Other Question

Engine is of length 12m. A and B are 2 bogies of 10m length each. Engine can turn only in obtuse angles but not in acute angle. For example Engine can turn as FEH but not as FEA. Now, the task is that I have to exchange the positions of A and B with the help of Engine and the engine should remain at the same place.

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How many 4 digit numbers are possible which don't contain 3 or 6 if repetition is allowed?