81. Lissajous pattern shown in double-beam cathode-ray oscilloscope screen for two sinusoidal voltages of equal magnitude and of the same frequency but of phase shift of 30° electrical is
82. The meter suitable for only DC measurement
83. What will be seen on the screen of a CRO, when a sinusoidal voltage signal is applied to the vertical deflection plate of this CRO with no simultaneous signal applied to the horizontal deflection plate?
84. A 0-300 V Voltmeter has an error of ±2% of full deflection. What would be the range of readings if true voltage is 30 V?
85. A sinusoidal voltage of amplitude 150 V has been applied to a circuit having a rectifying device and prevents flow of current in one direction and offers a resistance of 15 Ω for the flow of current in the other direction. If hot wire type and PMMC type instruments are connected in this circuit to measure the electric current, their readings would respectively be:
86. A popular method of increasing the range of an ac instrument is use of
87. A liquid flows through a pipe of 100 mm diameter at a velocity of 1 m/s. If the diameter is guaranteed within ±1% and the velocity is known to be within ±3% of measured value, the limiting error for the rate of flow is
88. Which of the following methods are used for producing damping torque in analog instruments?
1. Air friction damping
2. Fluid friction damping
3. Eddy current damping
4. Electromagnetic damping
1. Air friction damping
2. Fluid friction damping
3. Eddy current damping
4. Electromagnetic damping
89. Majority of digital voltmeter are built with a dual - slope ADC because:
90. The Wein bridge circuit shown in the figure below can be used as a frequency measuring device, provided

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