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Quiz 4
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Q.1
A CRO is used to measure ___________.
Voltage
Frequency
Phase
All of above
Q.2
Power gain in decibels is equal to voltage gain in decibels only when
Input impedance is equal to output impedance
Output impedance is zero
Never
Input impedance is zero
Q.3
___________ amplifier is used to drive the recorder.
Power amplifier
Pre amplifier
Operational amplifier
Differential amplifier
Q.4
Two multimeters A and B have sensitivities of 10 kΩ/V and 30 kΩ/V respectively. Then ___________.
Multimeter A is more sensitive
Multimeter B is more sensitive
Both are equally sensitive
None of the above
Q.5
A transducer that converts measurand into the form of pulse is called
Active transducer
Analog transducer
Digital transducer
Pulse transducer
Q.6
The outstanding characteristics of a D.C. amplifier is its
Ability to amplify Dc and low frequency signals
Temperature stability
Utmost economy
Avoidance of frequency sensitive components
Q.7
_____________ is the example of photo emissive cell
LDR
Photo diode
Photo transistor
Photo multiplier
Q.8
In foil strain gauge the thickness of foil varies from
2.5 micron to 6 micron
25 micron (or) less
25 micron to 60 micron
2.5 micron to 5 micron
Q.9
In phase response of a recorder noise level ___________ with the band width of a system
Increases
Decreases
Reaches unity
Reaches infinity
Q.10
Duration of rotation of pen in the PMMC system depends upon ___________.
Phase angle
Frequency
Magnitude
Direction
Q.11
Pressure transducer for measuring blood pressure is
Strain gauge transducer only
Strain gauge or capacitive transducer
Resistive transducer
Fiber optic transducer
Q.12
The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as
Active transducer
Primary sensor
Passive transducer
Self generating transducer
Q.13
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?
10 kΩ
20 kΩ
200 kΩ
None of the above
Q.14
Which of the following recorder gives slow response
X-Y recorder
Oscillographic
Galvanometric
Magnetic
Q.15
Piezo electric crystal can produce an emf
When external mechanical force is applied to i
When radiant energy stimulates the crystal
When external magnetic field is applied
When the junction of two such crystals are heated
Q.16
A strain gauge is a passive transducer and is employed for converting.
Mechanical displacement into a change of resistance
Pressure into a change of resistance
Force into a displacement
Pressure into displacement
Q.17
The most accurate device for measuring voltage is ___________.
Voltmeter
Multimeter
CRO
VTVM
Q.18
The shorter wave length of the electron permits the detailed examination of tiny objects due to reduction of __________ effects
Reflection
Diffraction
Refraction
Polarization
Q.19
The _________ of a recording system is the magnitude of input voltage required to produce a standard deflection in a recorded trace.
Accuracy
Linearity
Sensitivity
Resolution
Q.20
Pre amplifier isolation in ECG circuit is to
Increase input impedance
Decrease input impedance
Increase output impedance
Decrease output impedance
Q.21
Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Such materials are called
Piezo-electric
Photo-electric
Thermo-electric
Photo-resistive
Q.22
A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ___________
GS/(G+S)
G+S
G-S
None of the above
Q.23
For display of signal pattern ___________ voltage is applied to the horizontal plates of a CRO
Sinusoidal
Rectangular
Sawtooth
None of the above
Q.24
An ideal amplifier has
Noise figure of 0 db
Noise figure of more than 0 db
Noise factor of unity
Noise figure of less than 1 db
Q.25
Photo multiplier consists of
1 Photo emissive cathode & 2 dynodes
2 Photo emissive cathodes & 2 dynodes
2 Photo emissive cathodes & 1 dynode
1 Photo emissive cathode & 1 dynode
Q.26
For biomedical applications the mostly used amplifier is
Single ended amplifier
Differential amplifier
Inverting operational amplifier
Chopper amplifier
Q.27
Pick the correct statement regarding functions of a transducer
S1: Sense the magnitude, change in & / or frequency of same measurand
S2: To provide electrical output that furnishes accurate, quantitative data about the measurand
S1 is true & S2 is false
S2 is true & S1 is false
Both S1 & S2 are true
Both S1 & S2 are false
Q.28
S1: In multimode fiber optics, intensity modulating schemes can be employed.
S2: Schemes using polarizing techniques need birefringent fiber.
S1 is true and S2 is false
Both S1 and S2 are true
S1 is false and S2 is true
Both S1 and S2 are false
Q.29
LVDT windings are wound on
Steel sheets
Aluminium
Ferrite
Copper
Q.30
The input resistance of a VTVM is about ___________.
1000 O
10 kΩ
20 kΩ
10 MO
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