The two pressure coils of a single phase power factor meter have
The two pressure coils of a single phase power factor meter have
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?
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?
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
No eddy current and hysteresis losses occur in
No eddy current and hysteresis losses occur in
Why is a MISC meter not recommended for DC measurement?
Why is a MISC meter not recommended for DC measurement?
The resistance can be measured most accurately by
The resistance can be measured most accurately by
PMMC type instruments normally use
PMMC type instruments normally use
Which wave has the least form factor?
Which wave has the least form factor?
The chemical effect of current is used in
The chemical effect of current is used in
In a moving coil instrument, the deflecting torque is proportional to
In a moving coil instrument, the deflecting torque is proportional to
A megger is usually
A megger is usually
Which of the following devices should be used for accurate measurement of low D.C. voltage?
Which of the following devices should be used for accurate measurement of low D.C. voltage?
A CRO can display
A CRO can display
Which meter is suitable for the measurement of 10mV at 50MHz?
Which meter is suitable for the measurement of 10mV at 50MHz?
Electrostatic instruments are normally used for
Electrostatic instruments are normally used for
A mulliammeter can be used as
A mulliammeter can be used as
Ryall crest voltmeter is used for measurement of
Ryall crest voltmeter is used for measurement of
The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
For handling greater currents induction watt-meters are used in conjunction with
For handling greater currents induction watt-meters are used in conjunction with
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
The absolute measurement of resistance is done by
The absolute measurement of resistance is done by
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads
A moving iron ammeter may be compensated for frequency errors by
A moving iron ammeter may be compensated for frequency errors by
Some wire- wound resistors have bifilar winding. This type of winding is used to
Some wire- wound resistors have bifilar winding. This type of winding is used to
To measure the flux, devices used are based on
To measure the flux, devices used are based on
A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?
A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network?
The spring material used in a spring control device should have the following property.
The spring material used in a spring control device should have the following property.
When using ohmmeter, applied voltage is to be disconnected from the circuit because
When using ohmmeter, applied voltage is to be disconnected from the circuit because
A megger is usually
A megger is usually
Which of the following meters has a linear scale?
Which of the following meters has a linear scale?
A 10MHz CRO has
A 10MHz CRO has
Wagner earthing device is used to eliminate errors due to
Wagner earthing device is used to eliminate errors due to
In a gravity controlled instrument, the deflection angle is proportional
In a gravity controlled instrument, the deflection angle is proportional
The internal resistance of an ammeter should be
The internal resistance of an ammeter should be
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?
An instrument to be used for measurement and control should preferably have
An instrument to be used for measurement and control should preferably have
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
The error of an instrument is normally given as a percentage of
The error of an instrument is normally given as a percentage of
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
An oscilloscope indicates
An oscilloscope indicates
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is
In a moving iron meter, the deflecting torque is proportional to
In a moving iron meter, the deflecting torque is proportional to
The EMF of Weston standard cell is measured using
The EMF of Weston standard cell is measured using
The problem of Electrostatic coupling in a transformer is acute at
The problem of Electrostatic coupling in a transformer is acute at
Direct method is used to measure
Direct method is used to measure
The form factor in AC is the ratio of
The form factor in AC is the ratio of
The repeat accuracy of an instrument can be judged from its
The repeat accuracy of an instrument can be judged from its
In a ballistic galvanometer, the deflecting torque is proportional to
In a ballistic galvanometer, the deflecting torque is proportional to
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?
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 galvanometer has
A galvanometer has
Ampere is one of the
Ampere is one of the
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 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
The multiplier and the meter coil in a voltmeter are in
The multiplier and the meter coil in a voltmeter are in
