Q. Two ammeters A and B are connected in parallel in a circuit carrying 100 A. Their resistances are 0.8 mΩ. Their readings will be.

View solution

Q. In household energy meters the flux of series magnet is in phase with current but the flux of shunt magnet lags the voltage by 88°. The reading of energy meters

View solution

Q. Assertion (A): A universal RLC bridge has a battery and also a high frequency ac source.

Reason (R): RLC bridge uses a Wienbridge arrangement for measuring capacitance.

View solution

Q. A capacitance transducer can be used to measure

View solution

Q. The dynamometer principle can be used for

View solution

Q. Assertion (A): In hot wire instrument the material of hot wire in generally platinum iridium.

Reason (R): A hot wire ammeter is suitable for ac only

View solution

Q. The scale of hot wire ammeter is

View solution

Q. A moving coil meter has a shunt of 0.02 Ω resistance. If coil resistance is 1000 Ω and a potential difference of 500 mV is required across it to cause full scale deflection, the current through shunt is

View solution

Q. The emf of a Weston cell is 1.286 V.

View solution

Q. The power factor of a single phase load can be calculated if instruments available are

View solution

Q. A variable reluctance type tachometer has 150 teeth on rotor. The counter records 13500 pulse/sec. The rotational speed is

View solution

Q. The current through the coil of an electromagnet is doubled. The magnetic field around the coil

View solution

Q. In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be

View solution

Q. Two resistances R1 = 18.7 Ω. and R2 = 3.624 Ω in series. The total resistance to the appropriate number of significant figures is

View solution

Q. The input impedance of CRO is about

View solution

Q. Which of the following is not correct in respect of electrostatic instrument?

View solution

Q. The wave applied to X plates, for ohtaining trace of voltage wave, is

View solution

Q. The response of a thermistor overs the whole of its temperatures range is

View solution

Q. A resistance is measured by voltmeter-ammeter method. The voltmeter is 0-250V, ± 1% accuracy and ammeter is 0-5 A, ± 1 % accuracy. The readings of voltmeter and ammeter are 100 V and 2 A respectively. The error in the measured resistance can be

View solution

Q. It is required to study transients during switching process. Which CRO should be preferred?

View solution