In commercial cylinders, a plastic or ____ seal is used to form a tight barrier to prevent fluid from escaping around the piston.
A. rubber
B. brass
C. steel
D. aluminum
Answer: A
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Hoof should have the same angle as the horse's ____.
A. shoulders B. hips C. elbows D. pasterns
Natural defrosting accomplished by:
A) Leaving the case fans operating and shutting off the compressor. B) Keeping the compressor running and bypassing hot gas to the condenser. C) Keeping the compressor running and bypassing hot gas to the evaporator. D) Shutting off the compressor and energizing electric defrost heaters.
A ____ is used to explain symbols that are referenced to a specific plan.
A. dimension line B. title block C. schedule D. legend
A signal x(t) is sampled above its Nyquist rate to form a signal x[n] and is also impulse sampled at the same rate to form an impulse signal x?(t) . The DTFT of x[n] is X(F) = 10 rect(5F) ? ?1(F) or X ( ej? ) = 10 rect (5?/2?) ? ?2? (?) .
(a) If the sampling rate is 100 samples/second, what is the highest frequency at which the CTFT of x(t) is nonzero? (b) What is the lowest positive frequency greater than the highest frequency in x(t) at which the CTFT of x?(t) is nonzero? (c) If the original signal x(t) is to be recovered from the impulse sampled signal x?(t) , by using an ideal lowpass filter with impulse response h(t) = A sinc (wt) , what is the maximum possible value of w?