Questions and answers for exam Preparation

MCQs

Total Questions : 480 | Page 8 of 48 pages

Question 71. A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?

4.73
0.4 V
24 V
600 V
None of the above

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Answer: Option C. -> 24 V

Question 72. Which one of the following statements is true for the currents in a parallel RC circuit?

The total current is equal to the sum of the currents for the resistance and capacitance
The current always has the same amplitude and phase for every part of the circuit
The total current is less than the sum of the currents for the resistance and capacitance
The total current. is greater than the sum of the currents for the resistance and capacitance
None of the above

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Answer: Option A. -> The total current is equal to the sum of the currents for the resistance and capacitance

Question 73. Which one of the following statements is true for current flowing in a series circuit?

The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
The same current flows through every part of a series circuit
The total current in a series circuit is equal to the total voltage multiplied by the total resistance
None of the above

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Answer: Option C. -> The same current flows through every part of a series circuit

Question 74. The total inductance of a series inductor circuit is:

equal to the sum of the individual inductance values
equal to the sum of the individual inductive-reactance values
less than the value of the smallest inductor
equal to the source voltage divided by total current
None of the above

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Answer: Option A. -> equal to the sum of the individual inductance values

Question 75. When the graph of current versus voltage is a straight line, the device is referred to as

Active
Linear
Nonlinear
Bipolar
None of the above

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Answer: Option B. -> Linear

Question 76. Which one of the following statements most accurately applies to the frequency of a waveform?

The actual frequency of a sine waveform is 1.41 times the working frequency
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The higher the amplitude of a waveform, the higher its frequency
The longer the period of a waveform, the lower its frequency
None of the above

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Answer: Option A. -> The actual frequency of a sine waveform is 1.41 times the working frequency

Question 77. The merging of a free electron and a hole is called

Covalent bonding
Lifetime
Recombination
Thermal energy
None of the above

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Answer: Option C. -> Recombination

Question 78. One henry of inductance is defined as:

the amount of counter emf required to reduce a current to 1 A
the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of inductance required to change the frequency of a current by 1 Hz
the number of turns of wire in an inductor multiplied by the amount of current flowing through it
None of the above

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Answer: Option B. -> the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second

Question 79. The basic unit of measurement for current is the: