201. For measuring temperatures below 800°C with high accuracy, the best instrument is
202. Panel instruments are generally mounted vertically.
203. Assertion (A): Many instruments use eddy current damping.Reason (R): Eddy currents set up a magnetic flux which opposes the original movement which generates them.
204. The torque in induction wattmeters due to
205. During testing of an energy meter, the energy recorded by meter was 0.05 kWh and correct energy was found to be 0.09 kWh. The error and correction respectively are
206. Two resistances are : R1 = 36 Ω ± 1.89 Ω and R2 = 75 Ω ± 3.75 Ω. The sum R1 + R2 along with limiting error is
207. An instrument of accuracy class 1 can have an error equal to
208. In bridge circuit of figure, equivalent resistance between A and B is
209. Assertion (A): The scale a PMMC ammeter is linear.Reason (R): The deflecting torque of PMMC is proportional to current in the coil.
210. Assertion (A): Moving iron instrument can be used on ac or dc.Reason (R): In a moving iron instrument deflecting torque is proportional to square of current.
211. A land line telemetry system is suitable for distance upto
212. Use of high permeability core in moving iron instrument helps in
213. The resistance of series field winding is a low resistance.
214. Assertion (A): Double Kelvin's bridge is used to measure low resistances.Reason (R): In low resistance, the contact and lead resistances are very important.
215. Shaft encoder is used to measure
216. Assertion (A): Hay's bridge in particularly suitable for measuring inductance having a comparatively low resistance.Reason (R): In Hay's bridge the value of frequency supply must be known.
217. The device having highest photo sensitivity is
218. Which of the following closely represents the resistance-temperature characteristics of thermistor?
219. For use at 50 Hz the range of scale of vibrating reed frequency meter is
220. Consider the following statements about a moving iron instrument It is an unpolarised instrument.It has permanent magnet.It has a fixed coil.It has two iron vanes. Of these statements
221. The two pressure coils in a single phase power factor meter of turns
222. Piezoelectric effect can be used to measure
223. A current of 3.18 A is flowing through resistance of 35.68 Ω. The voltage drop across resistance to the appropriate number of significant figures is
224. A current of 3.25 A is flowing through a resistance of 34.98 Ω. The voltage drop across resistance to the appropriate number of significant figures is
225. The braking torque in single phase energy meter is proportional to speed of disc.