mirror of
https://github.com/idanoo/nzart-exam-generator.git
synced 2024-12-04 22:26:58 +00:00
148 lines
2.5 KiB
Plaintext
148 lines
2.5 KiB
Plaintext
|
% FILENAME = N13.TXT
|
||
|
|
% Meters and Measuring
|
||
|
|
% Release version 2, January 2000
|
||
|
|
|
||
|
|
%Question: 1
|
||
|
|
#13.1 An ohmmeter measures the:
|
||
|
|
|
||
|
|
value of any resistance placed between its terminals
|
||
|
|
|
||
|
|
impedance of any component placed between its terminals
|
||
|
|
|
||
|
|
power factor of any inductor or capacitor placed between its terminals
|
||
|
|
|
||
|
|
voltage across any resistance placed between its terminals
|
||
|
|
|
||
|
|
% ans 1
|
||
|
|
|
||
|
|
%Question: 2
|
||
|
|
#13.2 A VSWR meter switched to the "reverse" position provides an indication
|
||
|
|
of:
|
||
|
|
|
||
|
|
power output in watts
|
||
|
|
|
||
|
|
relative reflected voltage
|
||
|
|
|
||
|
|
relative forward voltage
|
||
|
|
|
||
|
|
reflected power in dB
|
||
|
|
|
||
|
|
% ans 2
|
||
|
|
|
||
|
|
%Question: 2
|
||
|
|
#13.3 The correct instrument for measuring the supply current to an amplifier
|
||
|
|
is a:
|
||
|
|
|
||
|
|
wattmeter
|
||
|
|
|
||
|
|
voltmeter
|
||
|
|
|
||
|
|
ammeter
|
||
|
|
|
||
|
|
ohmmeter
|
||
|
|
|
||
|
|
% ans 3
|
||
|
|
|
||
|
|
%Question: 4
|
||
|
|
#13.4 The following meter could be used to measure the power supply current
|
||
|
|
drawn by a small hand-held transistorised receiver:
|
||
|
|
|
||
|
|
a power meter
|
||
|
|
|
||
|
|
an RF ammeter
|
||
|
|
|
||
|
|
a DC ammeter
|
||
|
|
|
||
|
|
an electrostatic voltmeter
|
||
|
|
|
||
|
|
% ans 3
|
||
|
|
|
||
|
|
%Question: 5
|
||
|
|
#13.5 When measuring the current drawn by a light bulb from a DC supply, the
|
||
|
|
meter will act in circuit as:
|
||
|
|
|
||
|
|
an insulator
|
||
|
|
|
||
|
|
a low value resistance
|
||
|
|
|
||
|
|
a perfect conductor
|
||
|
|
|
||
|
|
an extra current drain
|
||
|
|
|
||
|
|
% ans 2
|
||
|
|
|
||
|
|
%Question: 6
|
||
|
|
#13.6 When measuring the current drawn by a receiver from a power supply, the
|
||
|
|
current meter should be placed:
|
||
|
|
|
||
|
|
in parallel with both receiver power supply leads
|
||
|
|
|
||
|
|
in parallel with one of the receiver power leads
|
||
|
|
|
||
|
|
in series with both receiver power leads
|
||
|
|
|
||
|
|
in series with one of the receiver power leads
|
||
|
|
|
||
|
|
% ans 4
|
||
|
|
|
||
|
|
%Question: 7
|
||
|
|
#13.7 An ammeter should not be connected directly across the terminals of a 12
|
||
|
|
volt car battery because:
|
||
|
|
|
||
|
|
the resulting high current will probably destroy the ammeter
|
||
|
|
|
||
|
|
no current will flow because no other components are in the circuit
|
||
|
|
|
||
|
|
the battery voltage will be too low for a measurable current to flow
|
||
|
|
|
||
|
|
the battery voltage will be too high for a measurable current to flow
|
||
|
|
|
||
|
|
% ans 1
|
||
|
|
|
||
|
|
%Question: 8
|
||
|
|
#13.8 A good ammeter should have:
|
||
|
|
|
||
|
|
a very high internal resistance
|
||
|
|
|
||
|
|
a resistance equal to that of all other components in the circuit
|
||
|
|
|
||
|
|
a very low internal resistance
|
||
|
|
|
||
|
|
an infinite resistance
|
||
|
|
|
||
|
|
% ans 3
|
||
|
|
|
||
|
|
%Question: 9
|
||
|
|
#13.9 A good voltmeter should have:
|
||
|
|
|
||
|
|
a very high internal resistance
|
||
|
|
|
||
|
|
a resistance equal to that of all other components in the circuit
|
||
|
|
|
||
|
|
a very low internal resistance
|
||
|
|
|
||
|
|
an inductive reactance
|
||
|
|
|
||
|
|
% ans 1
|
||
|
|
|
||
|
|
%Question: 10
|
||
|
|
#13.10 An rms-reading voltmeter is used to measure a 50 Hz sinewave of known
|
||
|
|
peak voltage 14 volt. The meter reading will be about:
|
||
|
|
|
||
|
|
14 volt
|
||
|
|
|
||
|
|
28 volt
|
||
|
|
|
||
|
|
10 volt
|
||
|
|
|
||
|
|
50 volt
|
||
|
|
|
||
|
|
% ans 3
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|