The 2023 Teacher Licensure Examination(NTC Exams) will begin on 13th September, 2023. Here are some likely Electronics questions and answers

1. Which of the following statements is true?
I. Unlike charges repel each other.
II. Like charges repel each other.
III. Unlike charges attract each other.

A. I and II only

B. I and III only

C. II and III only

D. I, II, and III

2. In a metal conductor, such as a copper wire,

A. positive ions are the moving charges that provide current.

B. free electrons are the moving charges that provide current.

C. free protons are the moving charges that provide current.

D. there are no free electrons.
none of the above.

3. When using a digital multimeter to measure the value of a resistor,
I. make sure there is no voltage present across the resistor.
II. make sure that the resistor is in a circuit where voltage is present.
III. make sure there is no other component connected across the leads of the resistor.

A. I and II only

B. I and III only

C. II and III only

D. I, II, and III

4. A group of electronics engineers needed a system that would enable them efficiently distribute a set of data from a single source to different output lines. Which of the following systems should these engineers design?

A. Multiplexer

B. Demultiplexer

C. Encoder

D. Decoder

5. Kofi, an electronic engineering student, was conducting a lab experiment when he observed an intriguing correlation between the current and voltage readings on his multimeter. He immediately turned to his professor and quizzically asked, “What’s the term for a device whose current and voltage relationship is a straight line?”

A. linear

B.active

C. Nonlinear

D. Passive

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6. In synchronized Unijunction Transistor (UJT) triggering of a Silicon Controlled Rectifier (SCR) voltage V_c across capacitor reaches Unijunction Transistor (UJT) threshold voltage thrice in each half-cycle so that there are three firing pulses during each half-cycle. The firing angle of the Silicon Controlled Rectifier (SCR) can be controlled

A. Once in each half-cycle

B. Twice in each half-cycle

C. Thrice in each half-cycle

D. Four times in each half-cycle

7. A group of young electronic engineers were engrossed in a Lab project, and they decided to use a mini generator as the voltage source. The ideal voltage of the generator was 12 V, with an internal resistance of 0.5 W. These engineers also wanted to obtain a stable output voltage source, so they decided to add a load resistor to the mini generator. What value of the resistor should they add to achieve this goal?

A. 20 ohms

B. 30 ohms

C. 40 ohms

D. 50 ohms

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8. As an electronics enthusiast, Anas loved spending her weekends tinkering with circuits in her basement. She had been trying to determine the drain voltage at which pinch-off would occur in an n-channel enhancement mode MOSFET with a gate voltage of 3 V and a threshold voltage of 0.5 V. Finally, after multiple trials, Anas found that pinch-off would occur at a drain voltage of

A. 1.5 V

B. 2.5 V

C. 3.5 V

D. 4.5 V

9. Kusi, an electrical engineer, was engrossed in designing an inverting amplifier circuit with a closed-loop gain of 25 using an op-amp with an open-loop gain of 100,000. But later, he decided to change the op-amp to one with an open-loop gain of 200,000. Curious to know what the new closed-loop gain would be, he posed the question “If I replace the op-amp with another one that has an open-loop gain of 200,000, what closed-loop gain will I obtain?”

A. Doubles

B. Drops to 12.5

C. Remains at 25

D. Increases slightly

10. Adongo, the engineer responsible for maintaining quality sound at Ghana Broadcasting Cooperation (GBC), had an important task at hand measuring the modulation index and lower sideband frequency for the station’s amplitude modulator circuit. To perform this task, he needed to consider the carrier wave given as C(t)=4sin(2000πt) and the modulating signal given as m(t)=2sin(2000πt). What would be the modulation index and low side band frequency for the system?

A. 0.2 and 9 kHz

B. 0.3 and 9 kHz

C. 0.4 and 9 kHz

D. 0.5 and 9 kHz

ANSWERS

1. C

2. B

3. B

4. B

5. A

6. A

7. D

8. B

9. C

10. D