75201. A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is
75202. If Eb is the potential of accelerating anode, the energy of electrons as they emerge from electron gun is proportional to
75203. A moving iron instrument has
75204. The temperature coefficient of resistance for a thermistor is
75205. To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken
75206. A linear displacement digital transducer generally uses
75207. Two wattmeter method for 3 phase power measurement can be used only for
75208. A coil resonates at 1 MHz with a resonating capacitance of 72 pF. At 500 pF, resonance is obtained with a resonating capacitor of 360 pF. The self capacitance of coil is
75209. A peak responding ac voltmeter using a half wave rectifier has been calibrated to read 1 V for 1 V rms sine wave input. If input is 1 V dc the reading will be
75210. For measuring inductance with high Q, we should use
75211. A resistance strain gauge has a resistance of about
75212. Assertion (A): The speed of a shaft can be measured by using a dc tacho generator.Reason (R): A two phase servometer can also be used as a speed transducer.
75213. The circuit of figure is used to measure the value Rx. Ammeter resistance Ra = 0.1 Ω voltmeter resistance Rv = 5000 Ω. It Rx1 and Rx2, are the measured values of Rx with switch in position 1 and 2, the mean of Rx1, and Rx2, is
75214. A Weston frequency meter is
75215. The 10 MHz in the specification of CRO means that
75216. Rayleigh current balance is an absolute instrument.
75217. An oscilloscope has an input impedance consisting of 1 MΩ and 20 pF is parallel. A high impedance probe connected to input of this oscilloscope has a 10 MΩ series resistance. This 10 MΩ series resistance
75218. Which of the following is used as detector in audio frequency ac bridges?
75219. Assertion (A): The gall tinsley potentiometer is a coordinate potentiometer and has two exactly similar potentiometers.Reason (R): An ac potentiometer may measure the unknown voltage in polar form or rectangular coordinate form.
75220. If d1, d2, ..., dn are n individual deviations, the standard deviation is
75221. DC voltage of the order of a few mV can be accurately of measured by
75222. If the load current is high, the pressure coil of wattmeter should be connected directly across the load.
75223. In measurements using CRO, Lissajous patterns are used to
75224. A dynamometer wattmeter is suitable for both dc and ac.
75225. If Ey is the voltage applied to Y plates, the vertical deflection of beam is proportional to
75226. The method of frequency compensation in moving iron voltmeter is
75227. Assertion (A): A photovoltaic cell is greatly affected by temperature.Reason (R): Both germanium and silicon can be used for photovoltaic cells.
75228. Wagner earthing device eliminates
75229. The deflection sensitivity of a CRO is generally expressed in
75230. The response of D'Arsonval galvanometer is over damped if
75231. The material used in RTD is
75232. Basically a potentiometer is a device for
75233. It is required to measure the true open circuit emf of a battery. The best device is
75234. If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be
75235. Measurement of non-electrical quantity involves the following subsystems Amplifier blockDisplay blockInstrumentation blockTransducer block The correct sequence of these blocks is
75236. Crompton potentiometer has
75237. Assertion (A): For best results the system of a D'Arsonval galvanometer should be slightly under damped.Reason (R): Degree of damping affects the time taken by the instrument to come to final position.
75238. Assertion (A): An RTD uses platinum coil.Reason (R): Platinum is a very stable material.
75239. Which of the following, is not a piezoelectric material?
75240. Harmonic distortion analyser
75241. The scale of thermocouple instrument is linear.
75242. Which of the following combinations is not used in thermocouple transducer measurement of temperature?
75243. The dynamic characteristics of capacitive transducer are similar to those of
75244. The electrical power to a megger is provided by
75245. The precision of an instrument indicates its ability to reproduce a certain reading with a given
75246. An electrostatic voltmeter is suitable for
75247. The flow rate of electrically conducting liquid without any suspended particle can not be measured by
75248. While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.
75249. The term 'Poisson's ratio' is connected with
75250. To increase Q factor of a coil, the wire should be
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