 A. Low frequencies
 B. Power frequencies
 C. High frequencies
 D. High load on the transformer
Measurement and Instrumentation

The problem of Electrostatic coupling in a transformer is acute at_____.

A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads_____.
 A. 111V
 B. 90V
 C. 50V
 D. 100V

It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?
 A. 100W
 B. 150W
 C. 50W
 D. 200W

The fullscale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?
 A. 99.99 K ohms
 B. 100 K ohms
 C. 99.99 ohms
 D. 100 ohms

The fullscale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?
 A. 49.99 Ohms
 B. 1/49.99 ohms
 C. 1 Ohm
 D. 2 Ohms

In a moving coil instrument, the deflecting torque is proportional to_____.
 A. Current
 B. Square of the current
 C. Squareroot of the current
 D. Sine of the measurand

The thermocouple instrument will measure_____.
 A. Current
 B. Voltage
 C. Flux
 D. None of the above

For handling greater currents induction wattmeters are used in conjunction with_____.
 A. Potential transformers
 B. Current transformers
 C. Power transformers
 D. Either of the above

An oscilloscope indicates_____.
 A. Peak to peak value of voltage
 B. DC value of voltage
 C. RMS value
 D. Average value

A permanent magnet moving coil ammeter has a coil resistance of 99ohm and Full Scale DeflectionFSD. current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is_____.
 A. 0.007mA
 B. 0.05mA
 C. 0.023mA
 D. 0.1mA