Main memory consists of registers and cache RAM
Indicate whether the statement is true or false
FALSE
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The ____ for a liquid-cooled power equipment engine usually consists of a 50:50 mixture of distilled water and antifreeze.
a. lubricant b. coolant c. refrigerant d. reagent
A gas, initially at T=500 K, undergoes a Joule-Thompson (constant enthalpy) expansion from P=10 atm to P=1 atm.
A) Prove that (dT/dP)H is equal to: (1/Cp)[T(dV/dT)P – V] (You may assume this expression is valid for parts B and C, even if you are unable to prove it.) B) Find an expression for (dV/dT)P for this gas, in terms of P, T and known constants, assuming it follows the equation of state: V = (RT/P) + aT2P2 For full credit your answer should be an algebraic equation—all derivatives should be evaluated. C) Assuming the heat capacity of the gas is constant at Cp=5R, and that ‘a’ is constant at 2x10-7 L mol-1K-2atm-2, find the final temperature of the gas.
The purpose of contactor 2M shown in Figure 3 is to _____.
a. short motor leads T4, T5, and T6 during starting to connect motor windings in a wye configuration b. energize motor leads T1, T2, and T3 for both wye and delta connections c. energize motor leads T4, T5, and T6 during running to connect the motor windings in a delta configuration d. connect resistors in series with the motor windings during the transition from start to run
Gas-fired rooftop units are normally vented through:
A) Draft hoods connected directly to the unit. B) A separate power venter. C) Double-wall vent pipe connected to the side of the unit. D) Double-wall vent pipe connected to the top of the unit.