A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. The internal resistance of the instrument is 100 and a full- scale deflection is produced by a DC current of 1 mA. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is?

A rectifier type AC voltmeter consists of a series resistance R, an id

1.	A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. The internal resistance of the instrument is 100 and a full- scale deflection is produced by a DC current of 1 mA. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is?
A.	63.56
B.	89.83
C.	89.83 k
D.	141.3 k
Answer» D. 141.3 k

Discussion

No Comment Found

Related MCQs

The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The logarithmic decrement is?
The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The damping ratio is?
A PMMC rated as 100 A is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?
Two 100 A full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?
A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?
A moving iron ammeter produces a full-scale torque of 240 N-m with a deflection of 120 at a current of 10 A. the rate of change of self-inductance ( H/rad) of the instrument at full scale is?
A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type AC voltmeter connected in parallel. If the meter readings are V<sub>a</sub> and V<sub>b</sub> respectively. Then the form factor may be estimated as?
A current of [2 + ( sqrt{2} ) sin (314t + 30) + 2 ( sqrt{2} ) cos (952t +45)] is measured with a thermocouple type, 5A full scale, class 1 meter. The meter reading would lie in the range?
A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. The internal resistance of the instrument is 100 and a full- scale deflection is produced by a DC current of 1 mA. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is?
A current of 8 + 6 ( sqrt{2} ) (sin ( t + 30 )) A is passed through three meters. The respective readings (in ampere) will be?

Discussion

No Comment Found

Related MCQs

Reply to Comment