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1) Peak to peak value of a sine wave is a. Equal to the maximum or phase value of sine wave b. Twice the maximum or phase value of sine wave c. Half of the maximum or phase value of sine wave d. Four times the maximum or phase value of sine wave
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2) The number of instantaneous values between zero and the peak value is a. Zero b. One c. Eleven d. Infinity
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3) If the voltage increases from zero to peak value and decreases back to zero during one alteration, then the average value must be a. Less than zero b. Greater than peak value c. Between zero to peak value d. None of these
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4) In Fleming’s right hand rule, the direction of the induced emf in the conductor is given by a. Index figure b. Middle figure c. Thumb d. None of these
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5) Yoke in a dc machine serves the function of a. Providing mechanical support to the poles b. Protects the dc machine from harmful atmospheric elements like dust, moisture and gases c. Offers a path of low reluctances to the magnetic flux produced by the poles d. All of these
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6) Laminations or stampings are used to reduce the eddy current losses. The direction of laminations should be such that a. They are perpendicular to the paths of eddy current and flux both b. They are parallel to the paths of eddy current and flux both c. They are perpendicular to the paths of eddy current and parallel to the flux d. They are parallel to the path of eddy current and perpendicular to the flux
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7) In a self excited generator, if the series field opposes the shunt field, then the generator is a. Cumulatively compounded b. Differentially compounded c. Series generator d. None of these
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8) Tangent galvanometer can be used to measure a. Voltage b. Current c. Power d. All of these
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9) Wattmeter is a / an a. Indicating instrument b. Integrating instrument c. Recording instrument d. All of these
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10) The magnetic effect is used in a. Moving iron attraction type instrument b. Moving iron repulsion type instrument c. Electrostatic ammeters and voltmeters d. All of these
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11) The springs should be a. Free from mechanical stress b. They should have a small resistance c. Sufficient cross-sectional area d. All of these
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12) In gravity control, at the zero position of the pointer the controlling torque is a. Zero b. One c. 0.5 d. 7
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13) Alternating voltage can be generated by a. By rotating a coil in a magnetic field b. By rotating a magnetic field within a stationary coil c. Either (a) or (b) d. Neither (a) or (b)
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14) The amplitude or peak value or maximum value of an alternating voltage is given by the coefficient of the a. Sine of the time angle b. Cosine of the time angle c. Tangent of the time angle d. Cotangent of the time angle
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15) Root mean square value of current is equal to a. 1.414 times the maximum value b. 1.732 times the maximum value c. Twice the maximum value d. 0.707 times the maximum value
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16) The ratio of maximum value to effective value of an alternating quantity is called a. Crest factor b. Peak factor c. Amplitude factor d. All of these
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17) The two alternating quantities could be added by constructing a. Squares b. Parallelograms c. Rhombus d. Trapeziums
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18) The undue deterioration in wiring due to the action of dampness, fumes, weather etc is a. Appearance b. Permanence c. Mechanical immunity d. Earthing
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19) For a two - way position control of lamp, the number of switches required is a. One b. Two c. Three d. Four
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20) The voltage of the earthed appliance when it is higher and when it is lower than the earth potential will a. Fall to zero, fall to zero b. Fall to zero, increase to zero c. Increase to zero, increase to zero d. Increase to zero, fall to zero
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