The given diagram shows an electron gun of a hot cathode ray tube.
A 6 V dc source and a 1000 V dc source are available. To obtain a focused beam of fast moving electrons the 6 V and 1000 V sources should be utilized such that
6 V dc source is connected to the terminals of X and 1000 V dc source is connected to the terminals of Y.
6 V should be applied to X and 1000 V should be applied to Y.