75102. Assertion (A): Thermistors are commonly used to measure hot spot temperatures in electric machines.Reason (R): Thermistor has the advantages of high temperature coefficient, small size and high speed of response.
75103. Absolute instruments are used in
75104. Burden of an instrument transformer is expressed in
75105. Which of the following devices should be used for accurate measurement of a low dc voltage?
75106. If σ is standard deviation, variation is
75107. An electrodynamometer instrument has the advantage of
75108. The dimensions of permittivity are
75109. A Q meter uses the principle of
75110. In semiconductor strain gauge
75111. Four terminal approach is used in measuring low resistance because it
75112. In Weston synchronoscope the fixed coils are connected across
75113. Which of the following is not a transducer in true sense?
75114. It is required to measure a low magnitude high frequency current. The proper instrument is
75115. Bridge circuits using RTD in temperature measurement usually employ 3 lead system so as to obtain
75116. The stator of phase shifting transformer for use in conjunction with an ac potentiometer has a
75117. An average responding voltmeter using full wave rectifier has been calibrated to read 1 V for 1 V rms sinusoidal input. For 1 V peak to peak square wave input, the meter reading will be
75118. The sensitivity of a potentiometer can be increased by
75119. Two resistances are R1 = 36 ± 5% and R2 = 75 ± 5%. If they are connected in parallel, the limiting error in percent will be
75120. An ac bridge uses galvanometer as detector.
75121. In figure, the reading of wattmeter will be proportional
75122. Consider the following statements about mutual inductances: The value should remain constant under all conditions.The mutual inductance should not vary with temperature.The inductance should be independent of excitation.They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range. Out of the above, correct statement are
75123. In low power factor wattmeter, the pressure coil is connected
75124. Figure shows the equivalent circuit of resistor. The resistor is non-inductive when
75125. The signal to noise ratio in telemetry should be better than
75126. Assertion (A): Electrodynamic instrument is not used as ammeter or voltmeter.Reason (R): Electrodynamic instrument is more costly than PMMC and moving iron instrument.
75127. Consider the following statements regarding electro-dynamometer type indicating instrument It can be used for measuring Direct currentAlternating currentDirect voltageAlternating voltage Of these statements
75128. Magnetic flux can be measured by
75129. Panel type instruments are used in
75130. Which of the following can be used for measuring capacitance?
75131. Assertion (A): In a CRT, grid is kept at negative potential with respect to cathode.Reason (R): The function of grid in an electronic tube is to control the number of electrons.
75132. For measuring current at a high frequency we should use
75133. A moving iron instrument can be used for dc as well as ac.
75134. Two wattmeter method of 3-phase power measurement can be used to find
75135. The multiplier resistance and meter coil in a voltmeter are in
75136. The adjustment of position of shading bands, in an energy meter, is done to provide
75137. The numbers of accelerating anodes in a CRO is
75138. Consider the following statements regarding phase sensitive detector The detector reads zero when phases of input signal and reference signal are different.The detector acts as a linear rectifier.The detector can be used as vector voltmeter. Of the above statements which are correct?
75139. In a Weston synchronoscope, the moving coil is connected across
75140. The coding system generally used in digital telemetry is
75141. The advantage of semiconductor strain gauge over resistance strain gauge is
75142. The advantage of LVDT over inductive bridge type transducer is that
75143. In a Weston synchronoscope the deflecting torque is zero when
75144. Assertion (A): Megger is used to check insulation resistance of cables. Reason (R): Insulation resistance of cables is very high.
75145. Assertion (A): A power factor meter operates on dynamometer principle. Reason (R): A power factor meter does not have a control spring.
75146. Assertion (A): A radiation pyrometer is very suitable for high temperature measurement.Reason (R): When temperature is high, a physical contact between hot body and thermometer is not desirable.
75147. The output of a Piezoelectric crystal has
75148. The pressure coil of a wattmeter should be connected to the supply side of the current coil when
75149. A universal RLC bridge uses
75150. If φsh is flux of shunt magnet, φse is flux of series magnet, ish is eddy current due to φse, the torque in an induction wattmeter is proportional to
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