Basic Electrical Engineering

111. Which of the following are active components

1. resistor and inductor
2. Diode, BJT, FET
3. Opamp, BJT, thermionic triode
4. Capacitor, Inductor

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112. Which of the following bulbs will have the least resistance?

1. 220V, 60W
2. 220V, 100W
3. 115V, 60W
4. 115V, 100W

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113. Which of the following can vary with ac, but never with dc?

1. Power
2. Voltage
3. Frequency
4. Amplitude

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114. Which of the following capacitor types is polarized?

1. Electrolytic
2. Paper
3. Ceramic
4. Mica
5. Air variable

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115. Which of the following has minimum running cost?

1. Hydro electric station
2. nuclear power station
3. thermal power station
4. diesel power station

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116. Which of the following is a polarized capacitor?

1. Paper
2. Mica
3. Inter electrode
4. Electrolytic

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117. Which of the following is ferromagnetic material?

1. Copper
2. Palladium
3. Silver
4. Cobalt

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118. Which one of the following does not affect the power output available from a particular ac generator?

1. The strength of the magnet
2. The number of turns in the coil
3. The type of natural energy source used
4. The speed of rotation of the coil or magnet

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119. With a unity load p.f, the effect of armature reaction on the main field flux of an alternator is

1. distortional
2. magnetising
3. demagnetising
4. nominal

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120. Zero power factor method of an alternator is used to find its

1. efficiency
2. voltage regulation
3. armature resistance
4. synchronous impedance

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