Introduction
Closseness to the Expected value
Define Accuracy.
This may be classified again as
1. Instrumental error
2. Observational error
3. Enviornmental error
How Systematic error is classified?
1. Size
2. Phosphor
3. Operating Voltages
4. Deflection Voltages
5. Viewing Screen
List the features of CRT?
Ramp type DVM
Integrating type DVM
Dual Slope type DVM
SAR type DVM
Staircase Type DVM
List the types of DVM.
Electrical Transducer
Mechanical Transducer
How transducer is generally classified?
The study of instrumnets.
Define Instrumentation.
The consistency of the measured value
What is Presicion?
A galvanometer in series with a high resistance is called ……………
A voltmeter
An ammeter should have ………….. resistance
Very low
If a multimeter has a sensitivity of 1000 Ω per volt and reads 50 V full scale, its internal resistance is ………..
50 kΩ
To send 10% of the main current through a moving coil galvanometer of resistance 99 Ω the shunt required is …………..
11 Ω
If the negative potential on the control grid of CRT is increased, the intensity of spot ………….
Is decreased
The most accurate device for measuring voltage is
a. Voltmeter
b. Multimeter
c. CRO
d. VTVM
CRO
A CRO is used to measure
a. Voltage
b. Current
c. Frequency
d. All the above
All the above
The induction of a Q-factor can be measured by a __________ bridge
Maxwell's Bridge
The Wien Bridge can be used for frequency measurements. say True (or) False
True
The resistance can be measured most accurately by
(a) Voltmeter-ammeter method
(b) bridge method
(c) multimeter
(d) Megger
(b) bridge method
The horizontal plates of a CRO are supplied with …………. to observe the waveform of signal.
a. Sinusoidal wave
b. Cosine wave
c. Sawtooth wave
d. None of the above
c. Sawtooth wave
The materiel used to coat inside the face of CRT is …………..
d. Phosphorous
An ideal ammeter has ………… resistance
Zero
A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?
3 kΩ
What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 μA of full-scale current?
200 kΩ
The sensitivity of a voltmeter which uses a 100 μA meter movement is ……………..
10 kΩ/V
an ammeter is inserted in the circuit, the circuit current will ………..
b. Decrease
Two multimeters A and B have sensitivities of 10 kΩ/V and 30 kΩ/V respectively. Then …………..
a. Multimeter A is more sensitive
b. Multimeter B is more sensitive
c. Both are equally sensitive
d. None of the above
b. Multimeter B is more sensitive