Mechanical Aptitude Basic Electrical Circuits Flashcards
7 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mechanical Aptitude Basic Electrical Circuits flashcards as text
In a parallel circuit with three branches, if one branch is opened (disconnected), what happens to current in the other two branches?
Answer: Current in the other branches stays the same
In a parallel circuit, each branch operates independently at the same voltage, so opening one branch does not affect current in the remaining branches.
A resistor is color-coded with bands: yellow, violet, red, gold. What is its resistance value?
Answer: 4,700 ohms ±5%
Yellow=4, violet=7, red=×100 multiplier gives 4,700 ohms, and gold indicates ±5% tolerance.
Which device is used to measure electrical current in a circuit?
Answer: Ammeter
An ammeter measures current flow (in amperes) and must be connected in series with the circuit.
What is the total resistance when a 10-ohm and a 40-ohm resistor are connected in parallel?
Answer: 8 ohms
Using 1/R_total = 1/10 + 1/40 = 4/40 + 1/40 = 5/40, so R_total = 40/5 = 8 ohms.
A 120V circuit has a 20A circuit breaker. What is the maximum power load this circuit can handle?
Answer: 2,400 watts
Power = Voltage × Current = 120V × 20A = 2,400 watts maximum.
What is the primary purpose of a fuse in an electrical circuit?
Answer: To protect the circuit from excessive current
A fuse contains a metal element that melts and breaks the circuit when current exceeds a safe level, protecting wiring and components.
In which type of circuit does electricity have only one path to flow from the source back to the source?
Answer: Series circuit
In a series circuit, all components are connected end-to-end forming a single continuous path for current.