253. It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is
254. Which of these instruments has highest power consumption?
255. If A = 629 ± 8 and B = 131 ± 3, A - B with range of doubt is
256. Assertion (A): If the reading of an instrument is low, the error is large.Reason (R): The error of an instrument is certain percentage of its full scale deflection.
257. A thermocouple instrument can be used over a very wide frequency range.
258. A vibration galvanometer is a
259. In a phase shifting transformer the currents in the two stator winding are in phase.
260. A power factor meter has
261. In a semiconductor strain gauge, the ohmic electrical contacts are generally made of
262. To measure dielectric loss you would use
263. Minute cracks in metals and minute faults in welded joints can be detected using
264. The resistance of voltmeter affects the accuracy of measurement in loss of charge method.
265. In a hot wire instrument, the deflection is proportional to
266. A permanent magnet moving coil meter can be used as
267. If temperature increases by about 50°, the resistance of thermistor changes to
268. Which of the following draws minimum power from source?
269. A megger has a hand driven dc generator.
270. A hot wire instrument is not affected by stray magnetic fields.
271. Assertion (A): A ballistic galvanometer is used to measure charge.Reason (R): In a flux meter, the damping is large.
272. Assertion (A): A transducer needs an output measuring or display device for measuring a non electrical quantity.Reason (R): In some transducers the output voltage is too small and needs amplification before it can be measured.
273. Acoustic strain gauges
274. Without a spectrum analyser, it is not possible to determine
275. A phase shifting transformer is used in conjunction with