226. To measure a resistance by a dc potentiometer
227. In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because
228. A multimeter can be used as ohmmeter.
229. A voltage of about 200 V dc can be measured
230. In a low power factor wattmeter, compensation for pressure coil current is provided.
231. De Sauty bridge is very widely used due to
232. A Weston synchronoscope is a
233. In a dynamometer 3 phase power factor meter, the planes of the two moving coils are at
234. A generated voltage is equally dependent on three resistances R1, R2, R3 and its value is V = (R1R2)/R3. If tolerance of each resistor is 0.1%, the maximum error in voltage is
235. Assertion (A): A thermocouple transducer is based on Seeback effect.Reason (R): In a thermocouple transducer used for temperature measurement, the cold junction is usually kept in ice bath.
236. In an Anderson bridge the unknown inductance is measured in terms of
237. In a Ballistic galvanometer
238. Which instrument needs creep compensation?
239. When deflecting torque and braking torque in an energy meter are zero,
240. The sensitivity of a voltmeter using 0-5 mA meter movement is
241. Two meters X and Y require 40 mA and 50 mA for full scale deflection. Then
242. A dual trace CRO has
243. For measuring mutual inductance we can use
244. The Y plates of a CRO are excited by a voltage 2 sin 100 t and the X plates are not connected. The display would be
245. Heating effect of current is used in
246. The coils of Drysdale polar potentiometer are wound non-inductively.
247. In figure the output V0 is
248. Magnetic effect of current is used in
249. Which of these instruments is dynamometers type?
250. The instrument used to check insulation of household wiring is