NEW YORK (TheStreet) -- Viewers once again posed questions via Twitter, and Jim Cramer answered them Tuesday from the floor of the New York Stock Exchange.

Asked for his views on BlackBerry  (BBRY) -- which reported a quarterly loss and a revenue miss -- Cramer said the key theme about BlackBerry is that it has positive cash flow. But while he thinks CEO John Chen is doing a good job, he thinks the company needs a catalyst. Specifically: "You need a takeover, and I don't know who's going to buy it."

Credit agency TransUnion is expected to debut in the market later this week. Cramer pointed out that rival Equifax  (EFX) has been a huge winner, so he thinks TransUnion is a buy. In the energy sector, Cramer was also asked what he thinks about Peabody Energy  (BTU) and Halliburton  (HAL). He called Peabody, a coal stock, just '"terrible." On Halliburton, he said as long as oil prices stay at current levels, investors would be better served to look at rival Schlumberger (SLB), which he believes can grow its business thanks to its international operations. He noted that Halliburton still has to complete its delayed acquisition of Baker Hughes  (BHI), which may require more divestments to pass muster with regulators. Baker Hughes, an oilfield services company, has been impacted by a record decline in rig counts.

Another viewer asked Cramer whether he made a mistake buying Qwest Diagnostics (DGX). The answer? No. Diagnostic stocks are red hot, so stick with the group.

Cramer was also asked about semiconductor company Ambarella (AMBA), a stock that rose on Tuesday after he recommended it Monday night. He thinks it has much more going for it than GoPro  (GPRO), citing the use of its chips in drones, home security and connected cars. Shares of Ambarella dropped sharply after Citron Research issued a bearish report on the company, but Cramer said that Ambarella is "fine." On CNBC's "Mad Money," Cramer pointed out the chipmaker is one of only a handful of companies with accelerating revenue growth.

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