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Electrical Engineering
Measurement And Instrumentation
Quiz 2
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Q.1
A mulliammeter can be used as
Voltmeter and ammeter
Wattmeter
Ohmmeter
Frequency meter
Q.2
Wagner earthing device is used to eliminate errors due to
Electrostatic coupling
Electromagnetic coupling
Both A and B
None of the above
Q.3
Some wire- wound resistors have bifilar winding. This type of winding is used to
Increase the thermal stability
Reduce the tolerance
Reduce the inductance of winding
Double the power rating of the resistor
Q.4
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
Load impedance is high
Load impedance is low
Supply voltage is low
None of the above
Q.5
An oscilloscope indicates
Peak to peak value of voltage
DC value of voltage
RMS value
Average value
Q.6
Electrostatic instruments are normally used for
Low current measurements
High current measurements
Low voltage measurements
High voltage measurements
Q.7
Which wave has the least form factor?
Square wave
Rectangular wave
Sine wave
Triangular wave
Q.8
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
Active power in R phase
Active power of Y phase
Reactive power of R phase
Power proportional to 3 phase power if the load is balanced
Q.9
The two pressure coils of a single phase power factor meter have
The same dimensions and the same number of turns
The same dimension but different number of turns
The same number of turns but different dimensions
None of the above
Q.10
To measure the flux, devices used are based on
Voltaic effect
Piezo-electric effect
Hall effect
Photo-voltaic effect
Q.11
A megger is usually
Moving iron type instrument
Electro-static type instrument
Hot-wire type instrument
Moving coil type instrument
Q.12
A megger is usually
Moving iron type instrument
Electro-static type instrument
Hot-wire type instrument
Moving coil type instrument
Q.13
The multiplier and the meter coil in a voltmeter are in
Series
Parallel
Series-parallel
None of the above
Q.14
A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?
5%
6.67%
10%
8.33%
Q.15
Ryall crest voltmeter is used for measurement of
AC voltage of any form
Low frequency voltage
High DC voltage
High AC voltage
Q.16
Direct method is used to measure
Length
Temperature
Pressure
Voltage
Q.17
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
360V and 240V
300V each
400V and 200V
One of the meters out of the range and other 100V
Q.18
No eddy current and hysteresis losses occur in
Electrostatic instruments
PMMC instruments
Moving iron instruments
Electrodynamo meter instruments
Q.19
The absolute measurement of resistance is done by
Ohm’s law method
Bridge Method
Rayleigh method
Lorenz method
Q.20
Ampere is one of the
Supplementary units
Derived units
Base units
Units used to measure charge
Q.21
The internal resistance of an ammeter should be
Very small
Medium
High
Infinity
Q.22
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads
111V
90V
50V
100V
Q.23
For handling greater currents induction watt-meters are used in conjunction with
Potential transformers
Current transformers
Power transformers
Either of the above
Q.24
When using ohmmeter, applied voltage is to be disconnected from the circuit because
Voltage source will increase resistance
Current will decrease resistance
The ohmmeter has its own internal battery
None of the above
Q.25
The resistance can be measured most accurately by
Voltmeter-ammeter method
Bridge method
Multimeter
Megger
Q.26
In a ballistic galvanometer, the deflecting torque is proportional to
The current through coil
Square of current through coil
Square-root of current through coil
Sine of measured
Q.27
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
One of the wattmeters will read zero
Both give the same readings
One of the wattmeter connections will have to be reversed
Pressure coil of the wattmeter will become ineffective.
Q.28
A 10MHz CRO has
5MHz sweep
10MHz vertical oscillator
10MHz horizontal oscillator
10MHz supply frequency
Q.29
A CRO can display
AC signals
DC signals
Both AC and DC signals
Time invariant signals
Q.30
A galvanometer has
Air friction damping
Fluid friction damping
Spring coil damping
Eddy current damping
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