Four voltmeters have following specifications. If accuracy is main consideration which is the best?
Figure shows a Wheatstone bridge with RTD to one arm. If resistance of RTD =Ω, the voltage V0 is
The ac bridge in figure is balanced. Z1 = 100∠30°, Z2 = 150∠0°, Z3 =-Then Z4 =
The Lissajous pattern observed on screen of CRO is a straight line inclined atto x axis. If X-plate input is 2 sin ωt, the Y-plate input is
A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-A range, the resistance of shunt should be
If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure ofdB is equal to
The angle δ for a mica capacitor is about
In a ballistic galvanometer, a charge ofμC gives a first swing of 25°. The charge required to cause first swing ofis
To increase Q factor of a coil, the wire should be
A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-A the shunt resistance should be
A piezoelectric force transducer has a charge sensitivity ofpC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier ismV/N. The gain of amplifier is
Which of the following voltmeters would you use for measuring voltage acrosskΩ resistance?
A digital voltmeter has a read out range from 0 tocounts. If the full scale reading is 9.V, the resolution is
The coil of a moving coil meter hasturns, ismm long andmm wide. The control torque isx 10-6 N-m on full scale. If B = 1 Wb/m2, range of meter is
Two resistors R1 =Ω ±and R2 =Ω ±are connected in series. The total resistance is
An ammeter of 0-A range has a guaranteed accuracy ofof full scale reading. The current measured is 5 A. The limiting error is
The coil of a moving iron instrument has a resistance ofΩ and an inductance of 1 H. It readsV when aV dc is applied. If series resistance isΩ, its reading when fed byV,Hz ac will be
Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through again amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
A single phase energy meter has the ratingresolutions/ kWh. If aW electric gadget is used for 4 hours, the energy meter will make
Consider the following statements: In a differential amplifier using JFET, the differential output offset is due to
In a strain measuring device using a strain gauge, the output quantity is
In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is
Assertion (A): A hot wire ammeter has a cramped scale.
Reason (R): The heat is proportional to square of current.
Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.
Reason (R): A wattmeter measures apparent power.
Assertion (A): De sauty's bridge is suitable only for pure capacitor.
Reason (R): Capacitors are mostly perfect.
In a CRO which of the following is not a part of electron gun
Which of the following is true about an impulse voltage?
As per BIS there are 6 accuracy classes of instruments.
In which of the transformer is the secondary nearly short circuited under normal operating conditions?
A meter having 0-μA range andΩ resistance is required to be changed to 0-mA meter. The value of shunt resistance is about
Electrostatic voltmeter is suitable only for low voltages.
A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is
Kelvin's double bridge is used to measure low resistances because
A capacitance transducer can be used to measure
Two resistances R1 = 18.7 Ω. and R2 = 3.Ω in series. The total resistance to the appropriate number of significant figures is
The loss of charge method can be used to measure
Consider the following statements
Insertion of a dielectric material between the plates of an air capacitor
A resistance is measured by voltmeter-ammeter method. The voltmeter is 0-250V, ±accuracy and ammeter is 0-5 A, ± 1 % accuracy. The readings of voltmeter and ammeter areV and 2 A respectively. The error in the measured resistance can be
An induction wattmeter can be used for
An accelerometer has a seismic mass of 0.kg and spring constant of 3 x 105 N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
Consider the following Statements regarding resistance strain gauge
Assertion (A): Shunt of an ammeter has a low resistance.
Reason (R): Shunt may be connected in series or in parallel with ammeter.
The dynamometer principle can be used for
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