The basic laws of physics state that every object with a temperature above absolute zero radiates energy in the form of __________.
A. photons
B. protons
C. electrons
D. electromagnetic waves
E. auras
Answer: D
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Servo valves use a(n) ____________________ to indirectly position the main spool and are used mainly for high-performance, closed-loop control of speed or position.
Fill in the blank(s) with the appropriate word(s).
Technician A says a disadvantage of drum brakes is that they require an adjusting mechanism to maintain the proper clearance between the shoe and drum. Technician B says a disadvantage of drum brakes is that they pull the car to one side during braking under certain conditions. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Which type of window allows both the upper and lower sashes to slide up and down along the jamb tracks?
A) Single-hung window B) Double-hung window C) Horizontal sliding window D) Fixed-sash window
In a bandpass filter using series resonance, the _____ of the circuit is low at the resonant frequency.
A. impedance B. ohmic value