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lawyer [7]
2 years ago
8

An installation consists of a 10-kVA, single-phase transformer with a 440-volt primary and a 110-volt, 2-wire secondary using in

sulation type THWN copper conductors. No secondary OCPD is installed. The secondary loads are considered to be noncontinuous loads. Calculate the minimum size secondary conductors required to handle the secondary full load current for this transformer.
Physics
1 answer:
Setler79 [48]2 years ago
6 0

Answer:

<em>Use a 150-amp breaker and No. 1/0 copper conductors</em>

Explanation:

An installation consists of a 10-kVA, single-phase transformer with a 440-volt primary and a 110-volt, 2-wire secondary using insulation type THWN copper conductors. No secondary OCPD is installed. The secondary loads are considered to be noncontinuous loads. Calculate the minimum size secondary conductors required to handle the secondary full load current for this transformer

Calculate primary full-load amps:

10 kVA ÷ (440 volts ÷ 1000) = 22.72 amps

Calculate required feeder breaker size and conductor ampacity:

22.72 amps x 1.5 = 34.09 amps

Use an 80-amp breaker and No. 3 AWG copper conductors 1

Calculate secondary full-load amps:

10 kVA ÷ (110 volts ÷ 1000) = 90.9 amps

Calculate required secondary breaker size and conductor ampacity:

90.9 amps x 1.25 = 113.6 amps

Use a 150-amp breaker and No. 1/0 THWN copper conductors.

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A ball is thrown up at a speed of 20 m/s.
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Given:

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3 years ago
Air as an ideal gas enters a diffuser operating at steady state at 5 bar, 280 K with a velocity of 510 m/s. The exit velocity is
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Answer:

Explanation:

Calculating the exit temperature for K = 1.4

The value of c_p is determined via the expression:

c_p = \frac{KR}{K_1}

where ;

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k = constant = 1.4

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we can rewrite the above equation as :

0 = c_p(T_1-T_2)+ \frac{(v_1^2-v_2^2)}{2}

T_2 =T_1+ \frac{(v_1^2-v_2^2)}{2 c_p}

where:

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