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Showing 1451 to 1475 of 3046 questions (page 59 of 122).

1451. Ampere's circuital law relates the line integral of the magnetic field around a closed loop to

A. the emf induced B. the enclosed current C. the loop area D. the enclosed charge E. the flux through the loop

1452. Lenz's law is a consequence of the conservation of

A. mass B. charge C. energy D. flux E. momentum

1453. The motional emf induced in a rod of length l moving with velocity v perpendicular to a magnetic field B is

A. B/vl B. B2vl C. Bl/v D. Bvl E. Bv/l

1454. The SI unit of self inductance is

A. tesla B. henry C. weber D. farad E. ohm

1455. The energy stored in an inductor of inductance L carrying current I is

A. LI2 B. LI C. (1/2)LI D. L/I2 E. (1/2)LI2

1456. In a step up transformer

A. the secondary has more turns than the primary B. the secondary current is greater C. power in the secondary exceeds that in the primary D. the secondary voltage is lower E. the secondary has fewer turns than the primary

1457. Eddy currents in transformer cores are reduced by

A. using a solid iron core B. using a copper core C. increasing the frequency D. removing the core E. laminating the core

1458. The root mean square value of an alternating current of peak value I_0 is

A. sqrt(2) I_0 B. I_0 C. I_0/sqrt(2) D. 2 I_0 / pi E. I_0/2

1459. The resonant frequency of a series LC circuit is

A. 1/(2 pi sqrt(LC)) B. 2 pi sqrt(LC) C. 1/(2 pi LC) D. 2 pi LC E. sqrt(LC)

1460. The capacitive reactance of a capacitor

A. is zero at all frequencies B. decreases with frequency C. is independent of frequency D. equals the resistance E. increases with frequency

1461. In a purely inductive AC circuit, the current

A. is zero B. leads the voltage by 90 degrees C. leads by 45 degrees D. lags the voltage by 90 degrees E. is in phase with the voltage

1462. The speed of electromagnetic waves in free space is

A. 1.5 x 10^8 m s-1 B. 332 m s-1 C. 3 x 10^10 m s-1 D. 3 x 10^8 m s-1 E. 3 x 10^6 m s-1

1463. The power factor of a purely resistive AC circuit is

A. 0.5 B. 1 D. infinite E. 0.707

1464. The SI unit of Young's modulus is

A. N m B. N m2 C. N m-2 D. dimensionless E. N m-1

1465. A solid in which the atoms have no long range order is called

A. amorphous B. ferromagnetic C. polymeric D. isomorphic E. crystalline

1466. In an insulator, the energy gap between the valence and conduction bands is

A. negative B. about 0.7 eV C. zero D. about 1.1 eV E. greater than about 5 eV

1467. Above the Curie temperature, a ferromagnetic material becomes

A. more strongly ferromagnetic B. non-magnetic in the sense of losing all response C. superconducting D. diamagnetic E. paramagnetic

1468. Stress within the elastic limit is

A. zero B. inversely proportional to strain C. directly proportional to strain D. proportional to the square of strain E. independent of strain

1469. A p-n junction diode conducts appreciably when

A. at absolute zero B. forward biased C. unbiased D. the depletion region widens E. reverse biased

1470. The output ripple frequency of a full wave rectifier fed from a 50 Hz supply is

A. 100 Hz B. 150 Hz C. 50 Hz D. 25 Hz E. zero

1471. A Zener diode in a voltage regulator circuit is operated in

A. the cut off region B. forward bias C. the saturation region D. reverse bias beyond the breakdown voltage E. zero bias

1472. Which logic gate is called a universal gate?

A. XOR B. NAND C. AND D. NOT E. OR

1473. In an ideal operational amplifier, the input impedance and open loop gain are respectively

A. zero and zero B. finite and unity C. infinite and infinite D. infinite and zero E. zero and infinite

1474. For a transistor operating as an amplifier, the emitter base junction and collector base junction are

A. both reverse biased B. unbiased C. reverse and forward biased respectively D. both forward biased E. forward and reverse biased respectively

1475. Doping silicon with a pentavalent impurity produces

A. an n-type semiconductor B. an insulator C. an intrinsic semiconductor D. a p-type semiconductor E. a superconductor

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