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You Are On Multi Choice Question Bank SET 1229

61451. In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ∈0(∈r - 1) E.



61452. For a superconductor, magnetisation M in a field H is





61453. The probability of recombination of electrons and holes in a semiconductor is proportional to





61454. Assertion (A): The regular or irregular stacking of atoms has importanteffect on properties of materials.Reason (R): The arrangement of atoms in a given material can be studied using X-rays.





61455. If temperature is increased, the temperature coefficient of a metal





61456. The application of magnetic field to superconducting material





61457. Automobile ignition systems use the principle of





61458. In a valence crystal, the valence electrons





61459. Transformer oil is





61460. Assertion (A): Drift velocity of electrons is proportional to the applied electric field E.Reason (R): The average drift velocity per unit field is called mobility.





61461. The materials having low retentivity are suitable for making





61462. If ∈r = ∈r' - j∈r" tan δ = .



61463. Assertion (A): Electron concentration n, hole concentration p and charge concentration ni are related by ni2 = np.Reason (R): p type semiconductor is obtained by adding trivalent impurity to intrinsic semiconductor.





61464. Diamond is a paramagnetic material.



61465. Which capacitor-store higher amount of energy?





61466. Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.



61467. In paramagnetic materials





61468. Assertion (A): Atomic number of sodium is 11.Reason (R): Sodium has a body centred cubic lattice.





61469. Uranium is used as a primary fuel in-power plant





61470. In an automobile transmission system the drive from gear box to the rear axle is taken by





61471. In a two stroke engine,the working cycle is completed by---------revolution of the crankshaft.





61472. The fuel injector used in:





61473. Earthing of electric installations are done using:





61474. If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure of 90 dB is equal to





61475. Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?





61476. 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





61477. Assertion (A): De sauty's bridge is suitable only for pure capacitor.Reason (R): Capacitors are mostly perfect.





61478. In which of the transformer is the secondary nearly short circuited under normal operating conditions?





61479. 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





61480. 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





61481. 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





61482. 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.





61483. As per BIS there are 6 accuracy classes of instruments.



61484. In figure, Z1 = 200∠60° Ω, Z2 = 400∠ - 90° Ω, Z3 = 300∠0°. Then Z4 for bridge to be balanced is





61485. 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





61486. Two resistors R1 = 36 Ω ± 5% and R2 = 75 Ω ± 5% are connected in series. The total resistance is





61487. 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





61488. In a strain measuring device using a strain gauge, the output quantity is





61489. 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





61490. The angle δ for a mica capacitor is about





61491. 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





61492. 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





61493. 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





61494. Magnetic flux density has the dimensions





61495. 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





61496. In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 Ω. The value of ΔR will be





61497. The household energy meter is





61498. 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





61499. 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



61500. 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





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