61501. Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
61502. Assertion (A): A hot wire ammeter has a cramped scale.Reason (R): The heat is proportional to square of current.
61503. Which of the following is true about an impulse voltage?
61504. Which of the following are needed both for protection and metering?
61505. A digital frequency counter can be converted to DVM by addition of a suitable
61506. A dynamometer wattmeter is connected in ac circuit. The reading will be
61507. The speed transducer using a drag cup rotor has the main advantage of
61508. A voltmeter using thermocouples measures
61509. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
61510. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?
61511. In a thermocouple temperature transducer, the output voltage is usually measured by
61512. A moving iron instrument gives correct reading when used at
61513. Induction wattmeter can be used in
61514. A dynamometer wattmeter is connected in ac circuit. The measured power is
61515. Loss of charge method is suitable for medium resistances.
61516. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
61517. It is required to measure angular position. Out of the transducers Circular potentiometerLVDTE pick upSynchro The proper devices are
61518. In figure the bridge is balanced when Z4 is
61519. Kelvin's double bridge is used to measure low resistances because
61520. Assertion (A): Shunt of an ammeter has a low resistance.Reason (R): Shunt may be connected in series or in parallel with ammeter.
61521. The scale of hot wire instrument is linear.
61522. The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a
61523. The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is
61524. Electrostatic voltmeter is suitable only for low voltages.
61525. An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 105 N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
61526. If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms
61527. A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be
61528. A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is
61529. LVDT is a
61530. A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is
61531. In Schering bridge, the potential of detector above earth potential is about
61532. The dimensions of EMF are
61533. Which of the following instruments has non-linear scale? Moving coil instrumentMoving iron instrumentElectrostatic instrumentRectifier instrument Select the answer as per following codes
61534. The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is
61535. A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be
61536. Which of these has a magnetic brake?
61537. Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is
61538. Assertion (A): Schering bridge is a low voltage bridge.Reason (R): Schering bridge is very commonly used for measurement of capacitance.
61539. Assertion (A): Wien bridge can be used for measuring frequency.Reason (R): A frequency meter for 50 Hz system has a frequency range of 40 to 60 Hz.
61540. Which of these has poor overload capacity?
61541. In 3 phase power measurement by two wattmeter method, both wattmeters had equal reading. The power factor of load is
61542. Which instrument is based on induction principle?
61543. Magnetic field intensity has the dimensions
61544. In figure, the position of voltmeter and ammeter are exchanged. It may result in damage to
61545. The volt ratio box is basically a
61546. A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in backward direction. A moving coil ammeter is also connected in the circuit. The reading of ammeter will be
61547. A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is
61548. In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v0 will be
61549. Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key) open Kbclose Kgclose Kbopen Kg The correct sequence of operations is
61550. Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than