Q. If Eb is the potential of accelerating anode, the energy of electrons as they emerge from electron gun is proportional to

View solution

Q. The circuit of figure is used to measure the value Rx. Ammeter resistance Ra = 0.1 Ω voltmeter resistance Rv = 5000 Ω. It Rx1 and Rx2, are the measured values of Rx with switch in position 1 and 2, the mean of Rx1, and Rx2, is

View solution

Q. If d1, d2, ..., dn are n individual deviations, the standard deviation is

View solution

Q. In figure the values of Rx and Cx are

View solution

Q. If J is moment of Inertia, D is damping constant, C is spring constant, G is displacement constant and I is current throught the coil of DArsonval galvanometer, the equation of motion is

View solution

Q. A meter with a resistance of 100 Ω and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be

View solution

Q. In a resistance strain gauge, G = 2, stress = 1050 kg/cm², R = 1000 Ω. The value of ΔR will be

View solution

Q. The household energy meter is

View solution

Q. A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

View solution

Q. A dynamometer wattmeter is connected in ac circuit. The measured power is

View solution

Q. Loss of charge method is suitable for medium resistances.

View solution

Q. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

View solution

Q. It is required to measure angular position. Out of the transducers

1.Circular potentiometer
2. LVDT
3. E pick up
4. Synchro

The proper devices are

View solution

Q. To increase Q factor of a coil, the wire should be

View solution

Q. An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is

View solution

Q. The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be

View solution

Q. In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is

View solution

Q. In a CRO which of the following is not a part of electron gun

View solution

Q. In a ballistic galvanometer, a charge of 100 μC gives a first swing of 25°. The charge required to cause first swing of 50° is

View solution

Q. Two resistors R1 = 36 Ω ± 5% and R2 = 75 Ω ± 5% are connected in series. The total resistance is

View solution