75151. If C is spring constant and θ is deflection, controlling torque is
75152. The operating voltage of a megger is about
75153. An ohmmeter is a
75154. Loading effect is primarily caused by instruments having
75155. Capacitive transducer is superior to inductive type for measurement of capacitance because of
75156. Which of the following effects is used in measurement of magnetic flux?
75157. Assertion (A): The sign and magnitude of displacement can be measured by an LVDT.Reason (R): LVDT is based on the principle of mutual inductance.
75158. In Maxwell's bridge the unknown inductance is measured by comparing it with a standard capacitor.
75159. Magnetic deflection sensitivity is defined as
75160. Which of the following is active transducer?
75161. Which is the displacement transducer with excellent sensitivity, linearity and resolution?
75162. The accuracy of a multimeter is about
75163. Induction wattmeter is an absolute instrument.
75164. In a current transformers
75165. The time base of a high frequency CRO whose screen diameter is 10 cm is set at 10 μ sec/cm. The lowest frequency which can be fully displayed on the screen is
75166. Eddy currents are essential for the deflecting torque of an induction wattmeter.
75167. Gauge factor of a strain gauge is
75168. Assertion (A): Capacitance effect can be used to measure thickness of sheets, displacement and pressure.Reason (R): Capacitance between two plates depends on the area of plates, distance between plates and permittivity of medium.
75169. The total insulation resistance consists of insulation volume resistance and surface leakage resistance.
75170. Assertion (A): Energy meters use induction principle.Reason (R): Induction wattmeter is less accurate than a dynamometer wattmeter.
75171. A dynamometer wattmeter can be used for
75172. If low pressure of 10-6 mm of Hg is required to be measured, we should use
75173. A transducer must have
75174. If two time varying signals of equal magnitude and zero phase displacement are applied to X and Y plates respectively; of CRO, the display will be
75175. Wagner earthing device is used to eliminate error due to
75176. RTD is generally suitable for temperature up to
75177. To measure moisture in wood, the most suitable method is
75178. An E transformer is a
75179. In which of the following instruments is the deflecting torque proportional to where L is inductance of coil and Q is deflection
75180. In a low power factor wattmeter, the resistance of pressure coil is more than in ordinary wattmeter.
75181. The moving iron instruments are generally repulsion type.
75182. It is required to measure pressure using LVDT. The additional device needed is
75183. Which of the following quantities have same dimension in emu and esu? CurrentElectrical powerElectrical energy Select the answer as per following codes
75184. In a dynamometer instrument, the moving coil is pressure coil.
75185. Load cell uses
75186. Assertion (A): A dc potentiometer measures the true open circuit emf of a source.Reason (R): At balance point, a dc potentiometer does not draw any current from the source.
75187. To measure an emf by dc potentiometer it is necessary to standardise the potentiometer with the help of a standard cell.
75188. Which of the following transformers has low primary current?
75189. The phenomenon of creep occurs in
75190. A D' Arsonval galvanometer is a
75191. Schering bridge is used to measure
75192. In a CRO the Y plates are oriented
75193. The accuracy of an instrument is determined by
75194. If σ standard deviation, probable error
75195. Assertion (A): In two wattmeter method of 3 phase power measurement, one of the wattmeters would read negative if power factor of load is less than 0.5.Reason (R): In two wattmeter method of 3 phase power measurement, both the wattmeters would show equal readings if power factor of load is unity.
75196. In a megger the moving coil meter has a permanent magnet.
75197. A direct current can be measured
75198. Consider the following galvanometers D'ArsonvalBallisticVibration Which of these are permanent magnet moving coil instruments?
75199. Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.
75200. Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.Reason (R): The time base generator develops a saw tooth voltage.
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