What minimum warm-up time is required for acceptable performance of a mercury Vapour arc black light?

Related MCQs

• When a mercury vapour black light is first turned on, what minimum warm-up time is normally required?
• If a mercury vapour arc black light is inadvertently turned off, how soon may it be restarted?
• The output of a mercury vapour black light depends on:
• When a mercury vapour black light is inadvertently cut off, approximately how long should it be allowed to cool before attempting to restart?
• For adequate test results, the black light used in fluorescent penetrant examination should provide what minimum black light intensity at the test surface?
• Mercury vapour black lights may be extinguished if the supply voltage drops below about:
• If the required exposure time for a 2220 GBq (60 curie) Ir-192 source is 2 minutes, what exposure time would be required at 1110 GBq (30 curie) source:
• If the required exposure time for a 1850 GBq (50 curie) Ir-192 source is 4 minutes, what exposure time would be required for 925 GBq (25 curie) source:
• If the required X ray exposure time for a 225 kV, 5 mA exposure is 3 minutes, approximately what exposure time would be required at 10 mA?
• If the required X ray exposure time for a 150 kV, 5 mA exposure is 2 minutes, approximately what exposure time would be required at 10 mA?