Air cleaners that use high-voltage DC current to ionize particles in the air and attract them to oppositely charged plates are a type of:
A) Electro-mechanical particle arrester. B) Electrostatic air cleaner.
C) Ultraviolet air sterilizer. D) Ionizing-plate air cleaner.
D
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____ is commonly used for tools and weapons
A) Zinc B) Copper C) Lead D) Mercury
Filler materials used in the high temperature connection of copper joints are composed of ____.
A. 50/50 tin-lead B. 95/5 tin-antimony C. 15%-60% silver D. bronze
When a heat pump is supplying as much heat as the load requires and is operating continuously, it is at what is called the ____________________.
Fill in the blank(s) with the appropriate word(s).
In this problem, we study a T1 carrier system used in digital telephony. Voice signals are usually filtered using a low-pass filter of cut-off frequency 3.4 kHz and then sampled at 8 kHz. This system multiplexes samples from 24 voice signals in a single sampling period. Voice signals are coded with 8-bit PCM, and each frame (one sampling period) consists of 24 samples plus a single bit added for synchronization.
a. Calculate the duration of each bit. Note that this system multiplexes 24 samples each with 8 bits plus a single bit onto the time duration between two consecutive samples Ts = 1/ fs . b. Calculate the resulting transmission rate. Known quantities: Voice signals have bandwidth of 3.4 kHz and sampled at 8 kHz with an 8-bit quantizer. Each frame of the T-1 line consists of 24 voice channel samples plus a single bit for synchronization. Find: a) Duration of each bit. b) Transmission rate.