- 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 full-scale 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 full-scale 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 watt-meters 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