TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: What needs consistency?, Context: The simplest valve gears give events of fixed length during the engine cycle and often make the engine rotate in only one direction. Most however have a reversing mechanism which additionally can provide means for saving steam as speed and momentum are gained by gradually "shortening the cutoff" or rather, shortening the admission event; this in turn proportionately lengthens the expansion period. However, as one and the same valve usually controls both steam flows, a short cutoff at admission adversely affects the exhaust and compression periods which should ideally always be kept fairly constant; if the exhaust event is too brief, the totality of the exhaust steam cannot evacuate the cylinder, choking it and giving excessive compression ("kick back").[citation needed]

SOLUTION: exhaust and compression periods

PROBLEM: Universal's parent company purchased Universal from whom?, Context: Matsushita provided a cash infusion, but the clash of cultures was too great to overcome, and five years later Matsushita sold an 80% stake in MCA/Universal to Canadian drinks distributor Seagram for $5.7 billion. Seagram sold off its stake in DuPont to fund this expansion into the entertainment industry. Hoping to build an entertainment empire around Universal, Seagram bought PolyGram in 1999 and other entertainment properties, but the fluctuating profits characteristic of Hollywood were no substitute for the reliable income stream gained from the previously held shares in DuPont.

SOLUTION: Matsushita

PROBLEM: What, in the article, happened 65 years before YSMI was renamed to YSMU?, Context: On the basis of the expansion and development of Yerevan State University a number of higher educational independent Institutions were formed including Medical Institute separated in 1930 which was set up on the basis of medical faculty. In 1980 Yerevan State Medical University was awarded one of the main rewards of the former USSR – the Order of Labor red Banner for training qualified specialists in health care and valuable service in the development of Medical Science. In 1995 YSMI was renamed to YSMU and since 1989 it has been named after Mkhitar Heratsi, the famous medieval doctor. Mkhitar Heratsi was the founder of Armenian Medical school in Cilician Armenia. The great doctor played the same role in Armenian Medical Science as Hippocrates in Western, Galen in Roman, Ibn Sīnā in Arabic medicine.

SOLUTION:
Medical Institute separated