**ANSWER KEY-Correct answer is indicated by symbol (V) in options.**

**HINTS-In some questions options E-HINTS is indicating the hints of answer.**

51) If a resistor and an inductor are connected in series across a voltage source. Which

two parameters in that circuit decrease if frequency of voltage source increases?

A [ ]) VL and Z.

**B [v]) VR and I.**

C [ ]) Z and I.

D [ ]) VL and VR.

52) If a resistor and a capacitor are connected to form series R - C circuit across a voltage

source. If frequency of voltage source increases

**A [v]) the current increases.**

B [ ]) the current decreases.

C [ ]) the current remain unaltered.

D [ ]) the current decreases abruptly.

53) Which of the following characteristics is attributed to an ideal independent voltage

source?

**A [v]) Independent of magnitude of current supplied.**

B [ ]) Dependent of the magnitude of current supplied.

C [ ]) Dependent of the direction of flow of current.

D [ ]) None of above.

54) With some initial change at t = 0+, a capacitor will act as

A [ ]) short circuit.

B [ ]) open circuit.

**C [v]) a voltage source.**

D [ ]) a current source.

55) i) In star connection line current is equal to phase current.

ii) In delta connection line voltage is equal to phase voltage.

For a given phase connected to the particular line which of the statement is true ?

A [ ]) Only (1).

B [ ]) Only (2).

**C [v]) Both (A) and (B).**

D [ ]) None of these.

56) A 3 -PHASE delta connected symmetrical load consumes P Watts of power from a

balanced supply. If the same load is connected in star to the same supply then what is the

power consumption?

**A [v]) P / 3.**

B [ ]) P.

C [ ]) 3P.

D [ ]) NONE

57) For a 3 - phase load balanced condition, each phase has the same value of

A [ ]) impedance.

B [ ]) resistance.

C [ ]) power factor.

**D [v]) all of these.**

58) In delta connected circuit when one resistor is open, then power will be

A [ ]) 0.

B [ ]) increased by factor of 3.

**C [v]) reduced by the factor of 3.**

D [ ]) remain unchanged.

59) In a highly capacitive circuit

A [ ]) actual power is more than its reactive power

**B [v]) reactive power is more than actual power**

C [ ]) reactive power is more than apparent power

D [ ]) apparent power is equal to the actual power

60) The peak factor of a triangular ac voltage wave is

A [ ]) 1

B [ ]) 1.11

C [ ]) 1.41

**D [v]) 1.732**

61) The right hand rule for determining the direction of the induced EMF was introduced by

A [ ]) Faraday

B [ ]) Lenz

**C [v]) Fleming**

D [ ]) Maxwell

62) Whenever the magnetic flux changes with respect to an electric conductor or a coil, an

EMF is induced in the conductor is Faraday’s

**A [v]) first law**

B [ ]) second law

C [ ]) third law

D [ ]) fourth law

63) Which of the following represents ohms law

A [ ]) V = RI

B [ ]) J = σE

C [ ]) I = GV

**D [v]) All of the above**

64) Conductor is constant and field is varying then emf will induce. This principle is called

A [ ]) virtually induced emf.

B [ ]) dynamically induced emf.

**C [v]) static induced emf.**

D [ ]) none of these

65) In the left hand rule, forefinger always represents

A [ ]) voltage.

B [ ]) current.

**C [v]) magnetic field.**

D [ ]) direction of force on the conductor.

66) Cork Screw rule is used to find

A [ ]) direction of current.

**B [v]) direction of magnetic field.**

C [ ]) direction of electric field.

D [ ]) direction of emf.

67) Biot-Savarts law states the relation between magnetic intensity and

A [ ]) filament current only.

B [ ]) surface current only.

**C [v]) volume current only.**

D [ ]) (A), (B), and (C) are all correct.

68) According to Coulomb’s law, the force of attraction or repulsion, between to electrical

charges is

A [ ]) directly proportional to the square of the distance between them.

B [ ]) inversely proportional to the square of the distance between them.

**C [v]) inversely proportional to the distance between them.**

D [ ]) directly proportional to the distance between them.

69) Ohm’s law in point from field theory can be expressed as

**A [v]) J = σE.**

B [ ]) V = IR.

C [ ]) J = E / σ.

D [ ]) R = ρ × ( l / A).

70) It was suggested by _____________ that the electric field should be imagined to be

divided into tubes of force containing a fixed number of line of force

A [ ]) Kelvin.

**B [v]) Faraday.**

C [ ]) Newton.

D [ ]) all of above.

71) The Biot-savarts law is a general modification of

A [ ]) Kirchhoffs law.

B [ ]) Lenzs law.

**C [v]) Amperes law.**

D [ ]) Faradays law.

72) The direction of induced emf can be found by

A [ ]) Laplaces law.

B [ ]) Kirchhoffs voltage law.

**C [v]) Lenzs law.**

D [ ]) Flemings right hand rule.

73) Conductor is varying and field is fixed then emf will induces. This principle is called

**A [v]) dynamically induced emf.**

B [ ]) static induced emf.

C [ ]) both A and B.

D [ ]) none of the above.

74) Flemings left hand rule may be applied to an electric generator to find out the direction

of

**A [v]) induced emf.**

B [ ]) rotor rotation.

C [ ]) magnetic field.

D [ ]) none of the above.

75) Which of the following is not the same as watt?

A [ ]) joule/sec

**B [v]) amperes/volt**

C [ ]) amperes x volts

D [ ]) ( amperes )² x ohm.

76) When P = Power, V = Voltage, I = Current, R = Resistance and G = Conductance, which

of the following relation is incorrect?

A [ ]) V = √ (PR)

B [ ]) P= V²G

**C [v]) G= P / I²**

D [ ]) I =√ (P / R)

77) The unit of electrical conductivity is

**A [v]) mho / metre**

B [ ]) mho / sq. m

C [ ]) ohm / metre

D [ ]) ohm / sq. m.

78) How many different combinations may be obtained with three resistors, each having

the resistance R ?

A [ ]) 3

**B [v]) 4**

C [ ]) 5

D [ ]) 6

79) Ohm's law is not applicable to

A [ ]) DC circuits

B [ ]) high currents

C [ ]) small resistors

**D [v]) semi-conductors.**

80) A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature

coefficient is

A [ ]) 0.00625 / °C

B [ ]) 0.0625 /°C

**C [v]) 0.000625 /°C**

D [ ]) 0.625 /°C.

81) Ohm's law is not applicable in all the following cases Except

A [ ]) Electrolytes

B [ ]) Arc lamps

**C [v]) Insulators**

D [ ]) Vacuum ratio values.

82) Which of the following has negative temperature coefficient ?

A [ ]) Brass

B [ ]) Mercury

**C [v]) Electrolytes**

D [ ]) Silver.

83) Variable resistors are

**A [v]) Wire wound resistors**

B [ ]) Thin film resistors

C [ ]) Thick film resistors

D [ ]) All of the above.

84) Temperature coefficient of resistance is expressed in terms of

**A [v]) ohms / ohms oC**

B [ ]) mhos / ohm oC

C [ ]) mhos / oC

D [ ]) ohms / oC.

85) A fuse is always installed in a circuit is

**A [v]) Series**

B [ ]) Parallel.

C [ ]) either series or Parallel.

D [ ]) both

86) The rating of fuse wire is expressed in terms of

A [ ]) Ohms

B [ ]) Mhos

**C [v]) Amperes**

D [ ]) Watts.

87) The current carrying capacity of the fuse material depends on

A [ ]) cross-sectional area

B [ ]) length

C [ ]) material

**D [v]) all of the above.**

88) ccording to the fuse law, the current carrying capacity varies as

A [ ]) diameter

**B [v]) (diameter)³⁄²**

C [ ]) 1 / diameter

D [ ]) )1 / (diameter)²

89) In the color code white color represents the number

**A [v]) 9**

B [ ]) 8

C [ ]) 7

D [ ]) 6

E [ ]) 5

90) Production of heat due to current is related by which law

A [ ]) Ohm's law

**B [v]) Joule's law**

C [ ]) Kelvin's law

D [ ]) Maxwell's law.

91) A rheostat differs from potentiometer in the respect that

A [ ]) rheostat has large number of turns

B [ ]) rheostat offers larger number of tappings

C [ ]) rheostat has lower wattage rating

**D [v]) rheostat has higher wattage ratings.**

92) Which of the following has negative coefficient of resistance?

A [ ]) Wire wound resistor

B [ ]) Metals

C [ ]) Non-metals

**D [v]) Thermistor.**

93) Certain substances lose their electrical resistance completely at finite low

temperatures. Such substances are called

A [ ]) dielectrics

**B [v]) super-conductors**

C [ ]) semi conductors

D [ ]) perfect conductors.

94) In a carbon resistor in case fourth stripe is not present, it can be concluded that

A [ ]) the resistor is highly accurate

B [ ]) the resistor is defective

C [ ]) the resistor does not contain carbon

**D [v]) the tolerance limit is ± 20 %.**

95) In a nickel-cadmium-alkali cell the electrolyte is

A [ ]) sulphur acid

**B [v]) potassium hydroxide**

C [ ]) zinc chloride

D [ ]) ammonium chloride.

96) All good conductors have high

A [ ]) resistance

B [ ]) electrical conductivity

C [ ]) electrical and thermal conductivity

**D [v]) conductance.**

97) A light dependent resistor is basically a

A [ ]) power resistor

B [ ]) non-metallic resistor

C [ ]) carbon resistor

**D [v]) variable resistor.**

98) Voltage dependent resistors are usually made from

A [ ]) graphite

B [ ]) charcoal

**C [v]) silicon carbide**

D [ ]) nichrome.

99) Metals approach super-conductivity conditions

**A [v]) near absolute zero temperature**

B [ ]) near critical temperature

C [ ]) at triple point

D [ ]) under the conditions of high temperature and pressure.

100) Voltage dependent resistors are used

A [ ]) as current stabilizers

B [ ]) as heating elements

C [ ]) for inductive circuits

**D [v]) to suppress surges.**

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