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You Are On Multi Choice Question Bank SET 1234

61701. To measure a resistance by a dc potentiometer

61702. In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because

61703. A multimeter can be used as ohmmeter.

61704. A voltage of about 200 V dc can be measured

61705. In a low power factor wattmeter, compensation for pressure coil current is provided.

61706. De Sauty bridge is very widely used due to

61707. A Weston synchronoscope is a

61708. In a dynamometer 3 phase power factor meter, the planes of the two moving coils are at

61709. A generated voltage is equally dependent on three resistances R1, R2, R3 and its value is V = (R1R2)/R3. If tolerance of each resistor is 0.1%, the maximum error in voltage is

61710. Assertion (A): A thermocouple transducer is based on Seeback effect.Reason (R): In a thermocouple transducer used for temperature measurement, the cold junction is usually kept in ice bath.

61711. In an Anderson bridge the unknown inductance is measured in terms of

61712. In a Ballistic galvanometer

61713. Which instrument needs creep compensation?

61714. When deflecting torque and braking torque in an energy meter are zero,

61715. The sensitivity of a voltmeter using 0-5 mA meter movement is

61716. Two meters X and Y require 40 mA and 50 mA for full scale deflection. Then

61717. A dual trace CRO has

61718. For measuring mutual inductance we can use

61719. The Y plates of a CRO are excited by a voltage 2 sin 100 t and the X plates are not connected. The display would be

61720. Heating effect of current is used in

61721. The coils of Drysdale polar potentiometer are wound non-inductively.

61722. In figure the output V0 is

61723. Magnetic effect of current is used in

61724. Which of these instruments is dynamometers type?

61725. The instrument used to check insulation of household wiring is

61726. Watthour meter is an integrating instrument

61727. An ammeter is

61728. It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is

61729. Which of these instruments has highest power consumption?

61730. If A = 629 ± 8 and B = 131 ± 3, A - B with range of doubt is

61731. Assertion (A): If the reading of an instrument is low, the error is large.Reason (R): The error of an instrument is certain percentage of its full scale deflection.

61732. A thermocouple instrument can be used over a very wide frequency range.

61733. A vibration galvanometer is a

61734. In a phase shifting transformer the currents in the two stator winding are in phase.

61735. A power factor meter has

61736. In a semiconductor strain gauge, the ohmic electrical contacts are generally made of

61737. To measure dielectric loss you would use

61738. Minute cracks in metals and minute faults in welded joints can be detected using

61739. The resistance of voltmeter affects the accuracy of measurement in loss of charge method.

61740. In a hot wire instrument, the deflection is proportional to

61741. A permanent magnet moving coil meter can be used as

61742. If temperature increases by about 50°, the resistance of thermistor changes to

61743. Which of the following draws minimum power from source?

61744. A megger has a hand driven dc generator.

61745. A hot wire instrument is not affected by stray magnetic fields.

61746. Assertion (A): A ballistic galvanometer is used to measure charge.Reason (R): In a flux meter, the damping is large.

61747. Assertion (A): A transducer needs an output measuring or display device for measuring a non electrical quantity.Reason (R): In some transducers the output voltage is too small and needs amplification before it can be measured.

61748. Acoustic strain gauges

61749. Without a spectrum analyser, it is not possible to determine

61750. A phase shifting transformer is used in conjunction with

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