Q. Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that

View solution

Q. In order to achieve accuracy, the slide wire of a potentiometer should be

View solution

Q. In measuring resistance using voltmeter and ammeter, the resistances of voltmeter and ammeter also affect the accuracy of measurement.

View solution

Q. A permanent magnet moving coil measures

View solution

Q. A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then

View solution

Q. In measurements using strain gauge, the dummy strain gauge is used to

View solution

Q. In an ac single phase energy meter, the potential coil is put on

View solution

Q. The chemical effect of current is used in

View solution

Q. The switch board instruments

View solution

Q. Radiation pyrometer is used to measure temperature in the range of

View solution

Q. The electromagnets of an induction wattmeter

View solution

Q. In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of

View solution

Q. In a CRO, the time base signal is applied to

View solution

Q. Schering bridge operates at a high voltage of about 10 kV.

View solution

Q. Which of these instrument does not have a control spring?

View solution

Q. In Weston frequency meter, the magnetic axes of the two fixed coils are

View solution

Q. Which one of the following is true?

View solution

Q. A single phase energy meter operates on induction principle.

View solution

Q. The accuracy of measurement using CRO is about

View solution

Q. The channel required for FM telemetry is

View solution