Q. Consider the following galvanometers

1. D'Arsonval
2. Ballistic
3. Vibration

Which of these are permanent magnet moving coil instruments?

View solution

Q. Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

View solution

Q. Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.

Reason (R): The time base generator develops a saw tooth voltage.

View solution

Q. A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

View solution

Q. The material used in RTD is

View solution

Q. Basically a potentiometer is a device for

View solution

Q. It is required to measure the true open circuit emf of a battery. The best device is

View solution

Q. If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be

View solution

Q. Measurement of non-electrical quantity involves the following subsystems

1. Amplifier block
2. Display block
3. Instrumentation block
4. Transducer block

The correct sequence of these blocks is

View solution

Q. An oscilloscope has an input impedance consisting of 1 MΩ and 20 pF is parallel. A high impedance probe connected to input of this oscilloscope has a 10 MΩ series resistance. This 10 MΩ series resistance

View solution

Q. Which of the following is used as detector in audio frequency ac bridges?

View solution

Q. Assertion (A): The gall tinsley potentiometer is a coordinate potentiometer and has two exactly similar potentiometers.

Reason (R): An ac potentiometer may measure the unknown voltage in polar form or rectangular coordinate form.

View solution