Module 7.4

Question 1

What is a dynamometer?

Answer 1

A device designed for power measurement

Question 2

What energises the moving coil in a dynamometer?

Answer 2

Voltage

Question 3

What energises the stationary coil in a dynamometer?

Answer 3

Current

Question 4

How is the moving coil connected in the circuit?

Answer 4

In series with a range resister so that the full load voltage is not applied to it

Question 5

How is a wattmeter rated?

Answer 5

In volts and amperes

Question 6

How does a frequency meter work?

Answer 6

A parallel inductor and capacitor in the form of a tank circuit

Question 7

What is measured in a frequency meter?

Answer 7

Maximum amplitude of voltage across the inductor and capacitor

Question 8

When is the frequency read from a meter?

Answer 8

When the device has been adjusted for maximum indication on the meter

Question 9

The capacitor in a frequency meter is variable with

Answer 9

adjustment knob and calibrated in Hertz

Question 10

What does a frequency counter comprise of?

Answer 10

An accurate clock
A gate circuit
A digital counter
An LCD display

Question 11

Frequency counters work by

Answer 11

dividing the number of pulses by the time the gate was open

Question 12

How can the frequency range of a counter be increased?

Answer 12

By adding a prescaler between the signal input and the counter

Question 13

Frequency counters measure up to 1 GHz. The speed is set by

Answer 13

the maximum speed of the digital logic

Question 14

What can oscilloscopes be used for?

Answer 14

Displaying time related wave forms
Frequency measurements
Voltage measurements

Question 15

The oscilloscope works by

Answer 15

Electron gun which projects a stream of electrons between deflecting plates into a phosphorescent coated screen

Question 16

What does the oscilloscope illumination depend on?

Answer 16

The quantity of electrons and their velocity in impact with the screen

Question 17

When is a low range pitot static leak test carried out?

Answer 17

Every time the pitot or static system is disturbed

Question 18

If there is a suspicion of a leak in a low range test what should happen next?

Answer 18

A full range leak check

Question 19

What is required for a pitot static leak test?

Answer 19

A calibrated ASI and a hand pump as well as a vacuum

Question 20

What is used for a high range pitot static leak test?

Answer 20

Air data test set

Question 21

What can an air data test set be used for?

Answer 21

High range leak test
Calibration of instruments
ATC and Mode C altitude report test

Question 22

What makes up an air data test set?

Answer 22

A pressure pump
Vacuum pump
Altimeter
VSI
ASI

Question 23

How is the moving coil of a dynamometer connected

Answer 23

In series with a range resistor so the full voltage is not applied

Question 24

The horizontal coil of wire in a dynamometer measures what?

Answer 24

Load current

Question 25

What does the frequency meter indicate?

Answer 25

Maximum amplitude of voltage across two components

Question 26

What is the frequency counter adjustment knob calibrated to?

Answer 26

Resonant frequency for any given setting

Question 27

In oscilloscopes -
The intensity of the illumination depends on what?

Answer 27

The quantity of electrons in the stream and their velocity on impact with the screen

Question 28

In oscilloscopes -
The potential at G1 of the CRT in an oscilloscope is negative. What controls the brightness of the illuminated spot?

Answer 28

Adjusting the R1 resistor

Question 29

In oscilloscopes -
G2 and G3 enables the electron stream to be focused at the screen

Answer 29

Positive potential difference

Question 30

In oscilloscopes - The position of the spot on the screen is determined by

Answer 30

the simultaneous effect of voltages applied to the X and Y deflecting plates