Wattmeter is of
1). PMMC type
2). Dynamometer type
3). Moving iron type
4). Hot wire type
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100 Ohm. This is to have full deflection when 100 V is measured. What is the value of series resistor to be used?
1). 99.9 K ohms
2). 100 K ohms
3). 99.99 ohms
4). 100 ohms
The electrostatic instruments can be used without serious loss of accuracy up to ________ frequency
1). 100 Hz
2). 100 kHz
3). 1 MHz
4). 10 MHz
If an instrument has cramped scale for larger values, then it follows
1). square law
2). logarithmic law
3). uniform law
4). none of the above
Swamp resistance and condenser are used
1). To reduce the error while measuring DC quantities in a moving iron instrument
2). To reduce the error while measuring AC quantities in a moving iron instrument
3). To reduce the error while measuring DC quantities in a moving coil instrument
4). None of the above