What is the purpose of a balanced modulator?
A. To produce an output frequency that varies in response to changes in a control voltage.
B. To change frequency in response to a DC control voltage applied to it.
C. To allow a range of frequencies to be generated from a stable, single-frequency reference.
D. To suppress the carrier, leaving only the two sidebands.
D
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Answer the following statements true (T) or false (F)
1 Burner flame impingement or poor flame distribution can cause overheating and failure of the tubes. 2 Poor control of excess air and poor draft control can lead to lost production time. 3 If atomization is not uniform, the burner tips on the atomization gun or burner require replacement. 4 When putting a vessel into service, the pressure should be increased quickly to operating pressure. 5 Accurate vessel wall thickness measurements may be made while the vessel is empty and clean.
Where is the lamp located when silhouette lighting is desired?
a. in front of the plant c. above the plant b. behind the plant d. under the plant
A one piece oil pan gasket often uses ________ in the middle to add strength
A) Hard rubber B) Plastic (nylon) C) Carbon fiber D) Steel
A refrigeration cycle in which the high side is above the critical point and the low side is below the critical point is called a:
A) Sub-critical system. B) Trans-critical system. C) Super-critical system. D) Non-critical system.