Общие:
Is the new engine being tested in the laboratory?
Isn't the new engine being tested in the laboratory?
Альтернативный:
Is the new engine or the new fan is being tested at the laboratory?
К подлежащему:
What is being tested in the laboratory?
What isn't being tested in the laboratory?
Разделительные:
The new engine is being tested in the laboratoty, isn't it?
The new engine isn't being tested in the laboratory, is it?