Q.1
The thermocouple instrument will measure
Q.2
The thermocouple instruments do not have
Q.3
Which of the following instruments can be used to measure AC current only?
Q.4
Wien bridge is useful for measuring
Q.5
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is
Q.6
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?
Q.7
If the instrument is to have a wide range, the instrument should have
Q.8
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?
Q.9
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is
Q.10
It can be stated that
Q.11
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
Q.12
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be
Q.13
The problem of Electrostatic coupling in a transformer is acute at
Q.14
Which meter is suitable for the measurement of 10mV at 50MHz?
Q.15
PMMC type instruments normally use
Q.16
Jewels are used in instruments for the purpose of
Q.17
The form factor in AC is the ratio of
Q.18
The error of an instrument is normally given as a percentage of
Q.19
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?
Q.20
The EMF of Weston standard cell is measured using
Q.21
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
Q.22
The chemical effect of current is used in
Q.23
Which of the following devices should be used for accurate measurement of low D.C. voltage?
Q.24
An instrument to be used for measurement and control should preferably have
Q.25
Which instrument has identical calibration for ac as well as dc values?
Q.26
The repeat accuracy of an instrument can be judged from its
Q.27
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
Q.28
In a gravity controlled instrument, the deflection angle is proportional
Q.29
In a moving coil instrument, the deflecting torque is proportional to
Q.30
In a moving iron meter, the deflecting torque is proportional to
0 h : 0 m : 1 s