51. The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100 ohms. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?
52. A spring controlled indicating instrument has a deflection of 90° for maximum current I. The corresponding deflection for a gravity controlled instrument is
53. PMMC type instruments normally use
54. Jewels are used in instruments for the purpose of
55. Which instrument has identical calibration for ac as well as dc values?
56. The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100 ohms. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?
57. If the instrument is to have a wide range, the instrument should have
58. It can be stated that
59. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
60. With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be
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