elec test 4

Under what condition is a technician required to plug the red DMM probe into the dedicated high-current 10A socket?

Currents exceeding milliampere

limits

What is the ohms-per-volt sensitivity of a voltmeter with a 50uA full-scale deflection (FSD)?

20,000 Ohms per Volt

Where do you plug the red and black DMM leads to measure a 28V DC aircraft bus?

Red V-omega-mA, Black COM

Why are the current-measuring input ports on a Digital Multimeter always equipped with high-capacity intemal fuses?

Prevent dead short hazard

Which statement describes circuit loading during voltage measurements

Parallel voltmeter draws current

How does megohmmeter (megger) differ fundamentally from a standard digital multimeter?

Applies 250v to 1000v dc

What is the severe safety hazard associated with connecting an ammeter in parallel across an active voltage source?

Creates high current short circuit

Why do modern Digital Multimeters (DMMs) virtually eliminate the error of circuit loading?

Constant 10 megohms impedance

What is the primary purpose of a parallel shunt resistor connected across d’Arsonval ammeter movement

Bypasses majority circuit current

What physical circuit state is indicated when a digital ohmmeter displays 'O.L! (Out of Limit) across a wire conductor?

Open circuit physical discontinuity

What core safety and and operational rules must be followed before using an ohmmeter to check a components resistance

De-energize circuit, isolate component lead

How must a voltmeter be physically connected in a circuit, and what is its ideal internal resistance

Parallel connection, infinite resistance

What physical phenomenon generates the mechanical deflection torque in an analog d’Arsonval meter movement

Movable coil permanent magnet

Why is touching bare ohmmeter probes bad practice in high resistance testing

Body resistance false low

How must an ammeter be physically connected in a circuit, and what is its ideal internal resistance?

Series connection

zero ohms