MEP SYSTEMS I ELECTRICAL EXAM HOUSTON ACTUAL

MEP SYSTEMS I ELECTRICAL EXAM – HOUSTON (ACTUAL

QUESTIONS AND VERIFIED ANSWERS

What is a circuit that contains only resistive components, such as heating elements and incandescent lamps? (21-460) - ---- Answers---Resistive Circuit

What is the state when voltage and current reach their maximum amplitude and zero level simultaneously? (21-460) - ----Answers---In-Phase

What is the property of a circuit that causes it to appose a change in current due to the energy stored in a magnetic field?All transformers create this. (21-460) - ----Answers--- Inductance

The greater the inductance in a circuit, the (larger / smaller) the phase shift. (21-460) - ----Answers---Larger

What is the ability of a component to store energy in the form of an electrical charge?It is produced by Capacitors (21-460) - ----Answers--- Capacitance

• / 3

The greater the capacitance in a circuit, the (larger / smaller) the phase shift. (21-460) - ----Answers---Larger

What is the most commonly used conductor? (21-461) - ---- Answers---Copper

What are the disadvantages of Aluminum as a conductor?Advantages? (21-461) - ----Answers---Not as good of a conductor as copper

Cheaper and lighter

What is heat measured in? (21-461) - ----Answers---British Thermal Units (Btu) or Calories (cal)

A calorie is the amount of heat needed to do what? (21-461) - - ---Answers---Raise 1 gram of water 1 Celsius

A British Thermal Unit is the amount of heat needed to do what? (21-461) - ----Answers---Raise 1 pound of water 1 Fahrenheit

One BTU = How many calories? (21-461) - ----Answers---252 Calories or 0.252 Kilocalories

What conducts and dissipates heat away from an object? (21- 462) - ----Answers---Heat Sink 2 / 3

How do you convert Fahrenheit to Celsius? (21-463) - ---- Answers---Subtract 32 from temperature, and divide by 1.8.

What is the portion of the electromagnetic spectrum that produces radiant energy? (21-463) - ----Answers---Light

Visible light with the longest wavelengths produce which color? (21-463) - ----Answers---Red

What is a unit used to measure the total amount of light produced by a light source? (21-464) - ----Answers---Lumen (lm)

What is the amount of light produced by a lamp (lumens) divided by the area that is illuminated? (21-464) - ---- Answers---Footcandle (fc)

What states that the amount of illumination on a surface varies inversely with the square of the distance from the light source? (21-464) - ----Answers---Inverse Square Law

What states that current in a circuit is proportional to the voltage and inversely proportional to the resistance? (23-493)

• ----Answers---Ohm's Law
• / 3