The full scale voltage across a moving coil voltmeter is about how much?
A10 V
B100 V
C5 V
D50 mV
Electrical Engineering · Question Bank
Instruments & Measurements
91 of 94 questions match · page 4 of 5. Answer in your head first, then check the solution.
An ammeter is what type of instrument?
AAn indicating instrument
BA recording instrument
CAn integrating instrument
DA comparison instrument
The range of a moving-iron ac ammeter is extended using which of the following?
AA shunt
BA multiplier
CChanging the number of turns of operating coil
DNone of these
What is measured by a megger?
AInsulation resistance
BShort circuit resistance
CResistance of the core
DResistance of the armature coils
In a dynamometer type instrument, damping is provided by which of the following method?
AAir friction
BFluid friction
CEddy currents
DNone of these
Which of the following equipment is not a part of a megger? 1
AHand crank
BMoving-coil meter
CSmall dc generator
DCoil of high inductance
Which of the following instruments is used to check the degree of motor shaft misalignment?
ADial indicator
BClamp-on ammeter
CGrowler
DMegohmmeter
How are voltmeters connected in a circuit?
AIn series
BIn parallel
CIn series-parallel
DIn parallel-series
Which statement is true about a wattmeter?
AIt measures ac power only
BIt measures dc power only
CIt measures both ac and dc powers
DIt measures reactive power only
One of the control springs of a permanent magnet moving coil ammeter is broken. If this ammeter is connected to a circuit to measure the current, what will be the reading?
AIt will read zero
BIt will read more than the correct value
CIt will read half of the correct value
DIt will still read the correct value
Sensitivity of a voltmeter is expressed in which of the following units?
AVolt/ampere
BAmpere/volt
CVolt/ohm
DOhm/volt
Which of the following instruments can be used to measure size of wires?
ATachometer
BMicrometer
CGalvanometer
DNone of these
Moving iron instruments have what type of scale?
AUniform scale
BSquared scale
CLinear scale
DLogarithmic scale
When the pointer of an indicating instrument is in the final deflected position, which one will be zero?
ADamping torque
BDeflecting torque
CControlling torque
DAll of these
Which of the following connections would be most likely to injure the instrument attached?
AAn ammeter in series in the circuit
BA voltmeter connected across the line
CAn ammeter connected across the line
DA voltmeter in series with the line
Which of the following is the reason why ammeter shunt is useful?
AIt will increase meter sensitivity
BIt will prevent overheating of the meter pointer
CIt will allow for measurement of large currents
DAll of these
What is measured by an ohmmeter?
AVoltage
BAmperage
CResistance
DInsulation resistance
Which of the following type of meter movement is considered the best type?
AD'Arsonval type
BThermocouple type
CIron-vane type
DDynamometer type
Which of the following statements is true about the internal resistance of a measuring instrument?
AThe internal resistance of an ammeter and a voltmeter should be very low
BThe internal resistance of an ammeter should be very low while that of a voltmeter should be very high
CThe internal resistance of an ammeter should be very high while that of a voltmeter should be very low
DThe internal resistance of an ammeter and a voltmeter should be very high
What is the purpose of providing a mirror behind the pointer in a measuring instrument?
AThe scale of the instrument is illuminated through the mirror
BThe mirror will help to visually investigate the condition of the pointer of the instrument
CThe mirror is used to protect the internal wiring of the instrument
DReading errors due to inclined observation is eliminated with the help of the mirror
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