Basic Electrical Engineering

91. The R.M.S. value of a half wave rectified sinusoidal alternating current with peak value Im is

1. Im / 1
2. Im / v2
3. Im / 2
4. Im v3

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92. The relationship between frequency and time period of ac waveform is

1. f = T
2. f = 1/ T²
3. f = 1/T
4. f = T²

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93. The rms value of sinusoidal 100V peak to peak is

1. 100 V
2. 50/√2 V
3. 50 V
4. 100/√2 V

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94. The sixth harmonic of a ac wave whose period is 1 Milli second has a frequency of

1. 0.006Hz
2. 167.0 Hz
3. 7.0 kHz
4. 6 kHz

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95. The stationary alternator should not be connected to live bus-bars because it

1. is likely to run as synchronous motor
2. will get short - circuited
3. will decrease bus - bar voltage though momentarily
4. will disturb generated emf's of other alternators connected in parallel.

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96. The superposition theorem is applicable to circuits only having elements

1. non-linear
2. passive
3. resistive
4. linear bilateral

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97. The unit of inductance is

1. Mho
2. hendry
3. ohm
4. farad

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98. The unit which indicates the rate at which energy is expended?

1. Watt
2. Ampere-hour
3. Coulomb
4. Volt

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99. The wire is stretched to double its length, then its resistance R will become

1. r/2
2. 4r
3. 2r
4. r/4

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100. Thevenin's equivalent circuit consists of

1. series combination of Rth, Eth, Rl
2. series combination of Rth, Eth
3. parallel combination of Rth, Eth, Rl
4. parallel combination of Rth, Eth

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