74751. In an automobile transmission system the drive from gear box to the rear axle is taken by
74752. In a two stroke engine,the working cycle is completed by---------revolution of the crankshaft.
74753. The fuel injector used in:
74754. Earthing of electric installations are done using:
74755. If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure of 90 dB is equal to
74756. Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?
74757. A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make
74758. Assertion (A): De sauty's bridge is suitable only for pure capacitor.Reason (R): Capacitors are mostly perfect.
74759. In which of the transformer is the secondary nearly short circuited under normal operating conditions?
74760. A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be
74761. A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is
74762. An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
74763. Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.Reason (R): A wattmeter measures apparent power.
74764. As per BIS there are 6 accuracy classes of instruments.
74765. In figure, Z1 = 200∠60° Ω, Z2 = 400∠ - 90° Ω, Z3 = 300∠0°. Then Z4 for bridge to be balanced is
74766. 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
74767. Two resistors R1 = 36 Ω ± 5% and R2 = 75 Ω ± 5% are connected in series. The total resistance is
74768. Figure shows an RC potentiometer to measure ac voltage. It is desired that V0/Vi should be independent of frequency. The value of C should be
74769. In a strain measuring device using a strain gauge, the output quantity is
74770. The Lissajous pattern observed on screen of CRO is a straight line inclined at 45° to x axis. If X-plate input is 2 sin ωt, the Y-plate input is
74771. The angle δ for a mica capacitor is about
74772. A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
74773. The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10-6 N-m on full scale. If B = 1 Wb/m2, range of meter is
74774. Consider the following statements: In a differential amplifier using JFET, the differential output offset is due to mismatch between FET parametersdifference in values of resistances used in circuitvariation in supply voltage. Of the statements, the correct statements are
74775. Magnetic flux density has the dimensions
74776. 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
74777. In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 Ω. The value of ΔR will be
74778. The household energy meter is
74779. 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
74780. A full wave rectifier type meter is used to measure the wave shape shown in figure. The voltmeter is calibrated to read rms value of sine wave. The reading of voltmeter will be
74781. A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be
74782. Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
74783. Assertion (A): A hot wire ammeter has a cramped scale.Reason (R): The heat is proportional to square of current.
74784. Which of the following is true about an impulse voltage?
74785. Which of the following are needed both for protection and metering?
74786. A digital frequency counter can be converted to DVM by addition of a suitable
74787. A dynamometer wattmeter is connected in ac circuit. The reading will be
74788. The speed transducer using a drag cup rotor has the main advantage of
74789. A voltmeter using thermocouples measures
74790. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
74791. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?
74792. In a thermocouple temperature transducer, the output voltage is usually measured by
74793. A moving iron instrument gives correct reading when used at
74794. Induction wattmeter can be used in
74795. A dynamometer wattmeter is connected in ac circuit. The measured power is
74796. Loss of charge method is suitable for medium resistances.
74797. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
74798. It is required to measure angular position. Out of the transducers Circular potentiometerLVDTE pick upSynchro The proper devices are
74799. In figure the bridge is balanced when Z4 is
74800. Kelvin's double bridge is used to measure low resistances because
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