Match the following. 

(A)        (B)        (C)        (D)

P-1        P-1          P-1          P-3

Q-2         Q-3          Q-2          Q-1

R-1         R-1          R-3          R-2

S-3         S-2         S-3          S-1

The dc current flowing in a circuit is measured by two ammeters, one PMMC and another electrodynamometer type, connected in series. The PMMC meter contains 100 turns in the coil, the flux density in the air gap is , and the area of the coil is . The electrodynamometer ammeter has a change in mutual inductance with respect to deflection of 0.5 mH/deg. The spring constants of both the meters are equal. The value of current, at which the deflections of the two meters are same, is_____________

The input impedance of the permanent magnet moving coil (PMMC) voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in volts is          

A periodic voltage waveform observed on an oscilloscope across a load is shown. A permanent magnet moving coil (PMMC) meter connected across the same load reads

A current of   is passed through three meters. They are a centre zero PMMC meter, a true rms meter and a moving iron instrument. The respective reading (in A) will be

A PMMC voltmeter is connected across a series combination of a DC voltage source  and an AC voltage source.  The meter reads

A moving coil of a meter has 100 turns, and a length and depth of 10 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200mT. The coil carries a current of 50mA. The torque on the coil is

The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

A rectifier type ac voltmeter consists of a series resistance  an ideal full wave rectifier bridge and a PMMC instrument as shown in Figure. The internal resistance of the instrument is 100 Ω and a full-scale deflection is produced by a dc current of 1mA. The value of  required to obtain full scale deflection with an AC voltage of 100 V (RMS) applied to the input terminals is

Two 100μA full-scale PMMC meters are employed to construct a 10V and a 100V full scale voltmeter. These meters will have figures of merit (sensitivities) as

An advantage of a permanent magnet moving coil instrument is that it is

The scale of a voltmeter is uniform. Its type is

A 0-10mA PMMC ammeter reads 4mA in a circuit. Its bottom control spring snaps suddenly. The meter will now read nearly

The current passing through a 10 Ohm resistor of figure (a) has the waveform in figure (b). The reading of the PMMC voltmeter connected across the resistor