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

Figure shows a Wheatstone bridge with RTD to one arm. If resistance of RTD =Ω, the voltage V₀ is

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

1. mismatch between FET parameters
2. difference in values of resistances used in circuit
3. variation in supply voltage.

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?

In a strain measuring device using a strain gauge, the output quantity is

Which of the following is true about an impulse voltage?

In a strain measuring device using a strain gauge, the output quantity is

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

1. Thermistor is more sensitive than platinum resistance thermometer
2. The resistance of thermistor is solely a function of its absolute temperature whether the source of heat is external or internal
3. Thermistor has linear temperature-resistance relationship
4. Thermistor has linear negative temperature coefficient

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

1. The gauge factor is in the range of 2 to 5.
2. The resistance changes due to change in specific resistance with strain.
3. The resistance increases with increase in temperature.

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