Questions and answers for exam Preparation

MCQs

Total Questions : 480 | Page 45 of 48 pages

Question 441. Molecule is

The smallest particle of a substance that retains the properties of that substance
A atom that has a shortage of electrons in its outer orbit
A atom that has an excessive number of electrons in its outer orbit
A atom that flows whenever there is an imbalance of electrical charges between two points
None of the above

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Answer: Option A. -> The smallest particle of a substance that retains the properties of that substance

Question 442. What form of energy is used for creating static electricity?

Solar energy
Mechanical energy
Chemical energy
Light energy
None of the above

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Answer: Option D. -> Light energy

Question 443. A transistor has a current gain of 125 and a base current of 30 ÂµA. What is the collector current?

3.75 mA
3.2 mA
0.05 mA
13 mA
None of the above

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Answer: Option A. -> 3.75 mA

Question 444. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm

180 degree
30 degree
45 degree
75 degree
None of the above

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Answer: Option C. -> 45 degree

Question 445. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?

0.17 V
10.17 V
20 V
18.8 V
None of the above

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Answer: Option A. -> 0.17 V

Question 446. For normal operation of the transistor, the collector diode has to be

Forward-biased
Reverse-biased
Nonconducting
Operating in the breakdown region
None of the above

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Answer: Option B. -> Reverse-biased

Question 447. The north pole of a magnet is the one:

that has its molecules arranged in a random pattern
that would be attracted to the earth's north magnetic pole
that would be repelled by the south pole of another magnet
that would be attracted to the earth's south magnetic pole
None of the above

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Answer: Option B. -> that would be attracted to the earth's north magnetic pole

Question 448. In a step-down transformer, which is larger?

Primary voltage
Secondary voltage
Neither
Impossible to say
None of the above

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Answer: Option A. -> Primary voltage

Question 449. A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?

90 Ohm - 101 ohm
90 Ohm - 110 ohm
98 Ohm - 100.1 ohm
99 Ohm - 102 ohm
None of the above

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Answer: Option B. -> 90 Ohm - 110 ohm

Question 450. When a parallel RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance
the difference between inductive and capacitive reactance is equal to the resistance
None of the above

Discuss Question

Answer: Option C. -> inductive reactance is equal to the capacitive reactance