74801. Assertion (A): Shunt of an ammeter has a low resistance.Reason (R): Shunt may be connected in series or in parallel with ammeter.
74802. The scale of hot wire instrument is linear.
74803. The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a
74804. The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is
74805. Electrostatic voltmeter is suitable only for low voltages.
74806. An accelerometer has a seismic mass of 0.05 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
74807. If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms
74808. A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be
74809. A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is
74810. LVDT is a
74811. A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is
74812. In Schering bridge, the potential of detector above earth potential is about
74813. The dimensions of EMF are
74814. Which of the following instruments has non-linear scale? Moving coil instrumentMoving iron instrumentElectrostatic instrumentRectifier instrument Select the answer as per following codes
74815. The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is
74816. A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be
74817. Which of these has a magnetic brake?
74818. Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is
74819. Assertion (A): Schering bridge is a low voltage bridge.Reason (R): Schering bridge is very commonly used for measurement of capacitance.
74820. Assertion (A): Wien bridge can be used for measuring frequency.Reason (R): A frequency meter for 50 Hz system has a frequency range of 40 to 60 Hz.
74821. Which of these has poor overload capacity?
74822. In 3 phase power measurement by two wattmeter method, both wattmeters had equal reading. The power factor of load is
74823. Which instrument is based on induction principle?
74824. Magnetic field intensity has the dimensions
74825. In figure, the position of voltmeter and ammeter are exchanged. It may result in damage to
74826. The volt ratio box is basically a
74827. A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in backward direction. A moving coil ammeter is also connected in the circuit. The reading of ammeter will be
74828. A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is
74829. In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v0 will be
74830. Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key) open Kbclose Kgclose Kbopen Kg The correct sequence of operations is
74831. Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than
74832. A 24 mm long conductor has a resistance of 128 Ω. The change in resistance is 13.3 Ω and change in length is 1.6 mm under tension. The gauge factor is
74833. Measuring of unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when
74834. In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz. It must be sampled at a rate of
74835. A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is
74836. Consider the following Statements regarding resistance strain gauge The gauge factor is in the range of 2 to 5.The resistance changes due to change in specific resistance with strain.The resistance increases with increase in temperature. Of the above statements, which are correct?
74837. PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is
74838. A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in reverse direction. The reading on hot wire ammeter will be
74839. When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is
74840. If eddy current damping is to be used, the disc of instrument should be
74841. The scale of moving iron instrument is linear.
74842. With a variable reluctance tachometer having 60 rotor teeth the count reads 3600 counts per minute. The speed in RPM is
74843. When measuring phase angle between two waves using a CRO, the time base generator is connected to
74844. It is required that a strain gauge has gauge factor of 100. The proper strain gauge is
74845. A meter having 0-1000 μA range and 1000 Ω resistance is required to be changed to 0-100 mA meter. The value of shunt resistance is about
74846. An induction wattmeter can be used for
74847. In the balanced bridge shown in figure. X should be
74848. If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is
74849. In an induction wattmeter, the shading bands are made of non conducting material.
74850. The current in a circuit is measured using a 150 : 1 CT If the ammeter reads 0.6 A, the circuit current is
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