Module 7c : Maintenance Practices Avionics
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This is a preparation exam for EASA. This is not an actual EASA exam.
- 1.In a permanent magnet moving coil, the pointer is returned to its original position by ___________.
- A.
The use of a hairspring.
- B.
Adding an opposing magnet.
- C.
Adjusting the "zero-knob"
- 2.What type of meter uses the principle of magnetic repulsion between like poles?
- A.
D'Arsonval Movement
- B.
Moving-vane Meter Movement
- C.
Permanent Magnet Moving-Coil Movement
- 3.If the range of current to be measured is greater than the full scale current of the meter, a __________ must be installed in ____________ with the meter.
- A.
Shunt capacitor, parallel
- B.
Shunt resistor, series
- C.
Shunt resistor, parallel
- 4.What device works on effect of sensed DC magnetic field on a self transmitted AC magnetic field to measure current flow?
- A.
Shunt meter
- B.
Multimeter
- C.
Current Transformer
- 5.Which device is categorized by 50:5, 100:5, 300:5, etc. as ratio of the current between the conductor and the meter reading?
- A.
Current transformer
- B.
Ammeter
- C.
D'Arsonval Meter
- 6.What type of meter is used to measure the pressure being applied to the circuit?
- A.
Ammeter
- B.
Wattmeter
- C.
Voltmeter
- 7.To measure voltage in a circuit, the voltmeter should be connected in ________.
- A.
Series
- B.
Parallel
- 8.What will happen if the voltmeter is reverse connected into an energized circuit?
- A.
Nothing will happen.
- B.
The meter power supply will discharge.
- C.
The needle might be damaged.
- 9.What device is connected to the d'Arsonval meter to allow measurement of AC current?
- A.
Transformer
- B.
Rectifier
- C.
Inverter
- 10.What is the process of "smoothing-out" the oscillation of the pointer in the d'Arsonval meter?
- A.
Rectification
- B.
Damping
- C.
Vibration
- 11.Which method is used in damping othe vibrations due to rectifiers in an d'Arsonval meter?
- A.
Using an airtight chamber containing a vane
- B.
The moving coil is wound around a thin aluminum bobbin
- C.
By the induced magnetic field in the coil.
- 12.Which device is commonly known as of an electrodynamic type?
- A.
Ammeter
- B.
Voltmeter
- C.
Wattmeter
- 13.A wattmeter is rated in ______.
- A.
Watts
- B.
Volts
- C.
Amperes
- 14.When using an ohmmeter, the needle pointer will deflect to what direction if it reads high resistance?
- A.
To the right.
- B.
To the left.
- C.
Will not move.
- 15.What is the purpose of the mirror on the scale of an analogue meter?
- A.
To remove parallax error.
- B.
To make it easier to read the value.
- C.
To see if the pointer is moving to the right direction.
- 16.Which of the following is true about an ohmmeter?
- A.
Connect the ohmmeter in series to measure the resistance.
- B.
Full scale deflection reads minimum resistance.
- C.
Measure resistance in an energized or de-energized ciruits.
- 17.
- A.
1000 ohms resistance is needed to 1 milliamp of current at FSD
- B.
1 ohm resistance is needed to 1 milliamp of current at FSD
- C.
100 ohms resistance is needde to 1 milliamp of current at FSD
- 18.What device is used to measure the resistance of the insulation while subjecting it to a high voltage?
- A.
Safety Meter
- B.
Digital Multimeter
- C.
Megger
- 19.When testing for insulation resistance, it is necessary to test at a voltage approximately
- A.
1.5 times the operating voltage
- B.
15 times the operating voltage
- C.
0.5 times the operating voltage
- 20.What device is a low reading ohmmeter and measures resistance in milliohms that tests the bonding of aircraft components and structure?
- A.
Safety Ohmmeter
- B.
Milliohmmeter
- C.
Bonding Meter
- 21.Which device are specifically designed for ultra safe resistance on explosive devices and in hazardous environments?
- A.
Megaohmeter
- B.
Safety Ohmmeter
- C.
Analogue Meter
- 22.If the arrow is toward the load, a RF Directional Wattmeter is measuring the
- A.
Forward Power
- B.
Reflected Power
- C.
Electrical Power
- 23.What device is used to measure forward and reflected power of RF radio devices?
- A.
Time Domain Reflectometer
- B.
RF Directional Wattmeter
- C.
ATC/DME Meter
- 24.What device is used to determine the digital state of an electronic circuit?
- A.
Oscilloscope
- B.
Time Domain Reflectometer
- C.
Logic Probe
- 25.What device is used to determine the shape of a video pulse or signal appearing at a selected test points?
- A.
Time Domain Reflectometer
- B.
RF Directional Wattmeter
- C.
Oscilloscope
- 26.Using an oscillosope, the voltage at selected test point is measured as 100V. What is the equivalent RMS voltage?
- A.
65V
- B.
50V
- C.
70V
- 27.What device is used to attenuate a signal without distorting the waveform?
- A.
Amplifier
- B.
Attenuator
- C.
Decade Box
- 28.Before using an attenuator probe, you must
- A.
Adjust the compensating capacitor
- B.
Adjust the voltage shown in the oscilloscope.
- C.
Adjust the output of a signal generator.
- 29.What device is used in analyzing the magnitude and shape of reflected waveform in a coaxial signals?
- A.
RF Directional Wattmeter
- B.
Time Domain Reflectometer
- C.
Oscilloscope
- 30.An ammeter must never be connected ________ the power supply.
- A.
In series with
- B.
In parallel with
- C.
Opposite the
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