1. The current requirement of a LED is_______
- a) 1.7mA
- b) 25mA
- c) between 3 and 35 mA
- d) 65mA
Answer: C - LED (Light Emitting Diode) typically requires current between 3mA and 35mA, with 20mA being the most common operating current.
2. The current in a circuit is 45mA. This is_______
- a) 0.045Amp
- b) 0.00045A
- c) 0.0045A
- d) 0.45A
Answer: A - 45mA (milliamps) = 45 ÷ 1000 = 0.045 Amperes. 1mA = 0.001A.
3. Shunting the ac component away from the load is the task of a_______
- a) transformer
- b) filter
- c) regulator
- d) rectifier
Answer: B - A filter shunts the AC component away from the load, allowing only DC to pass through in power supply circuits.
4. Condensor store electrical energy_______
- a) TRUE
- b) FALSE
- c) N.A.
- d) N.A.
Answer: A - TRUE. A condenser (capacitor) stores electrical energy in an electrostatic field between its plates.
5. In a diode schematic, the anode is represented by a(n)_______
- a) triangle
- b) vertical line
- c) zig-zag line
- d) element indicator
Answer: A - In a diode schematic symbol, the anode is represented by a triangle (arrow) pointing toward the cathode line.
6. What is the result when a decimal 5238 is converted to base 16?
- a) 327.375
- b) 12166
- c) 1388
- d) 1476
Answer: D - 5238 decimal converted to hexadecimal is 1476 (1×4096 + 4×256 + 7×16 + 6 = 5238).
7. Why is heat produced in a diode?
- a) due to current passing through the diode
- b) due to voltage across the diode
- c) due to the power rating of the diode
- d) due to the PN junction of the diode
Answer: A - Heat is produced in a diode due to current passing through it (power dissipation P = V × I).
8. Which is not a common value of resistance
- a) 2k2
- b) 220k
- c) 68k
- d) 4k4
Answer: D - 4k4 (4.4kΩ) is not a standard E-series resistor value. Common values are 2.2kΩ, 220kΩ, and 68kΩ.
9. Electrolytic condenser works only in_______
- a) AC supply
- b) DC supply
- c) AC DC both supply
- d) N.A.
Answer: B - Electrolytic capacitors are polarized and work only with DC supply. Reverse polarity can damage them.
10. What is the color of resistance value 1.2K_______
- a) Brown Red Yellow
- b) Brown Red Red
- c) Brown Red Brown
- d) None of this
Answer: B - 1.2kΩ = 1200Ω. Color code: Brown(1), Red(2), Red(×100) = 12 × 100 = 1200Ω.
11. SPST IS A_______
- a) CONNECTOR
- b) JUMPER
- c) SWITCH
- d) None of this
Answer: C - SPST stands for Single Pole Single Throw, which is a type of switch that controls one circuit with one on/off position.
12. OR GATE output are_______
- a) (A.B)
- b) (A+B)
- c) (A-B)
- d) (AB)
Answer: B - OR gate output is A+B (logical sum). Output is HIGH if at least one input is HIGH.
13. primary & secondary a part of_______
- a) transformer
- b) IC
- c) coil
- d) capacitor
Answer: A - Primary and secondary windings are parts of a transformer used for voltage stepping up or down.
14. The weight of the LSB as a binary number is_______
- a) 1
- b) 2
- c) 3
- d) 4
Answer: A - LSB (Least Significant Bit) has a weight of 1 (2^0) in binary number representation.
15. MOSFET is a_______
- a) DIODE
- b) TRANSISTOR
- c) CAPACITOR
- d) IC
Answer: B - MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a type of transistor used for switching and amplification.
16. (A.B) is a_______
- a) OR GATE OUTPUT
- b) NAND GATE OUTPUT
- c) AND GATE OUTPUT
- d) None of this
Answer: C - (A.B) represents AND gate output. Output is HIGH only when both inputs A and B are HIGH.
17. The diode schematic arrow points to the_______
- a) trivalent-doped material
- b) positive axial lead
- c) anode lead
- d) cathode lead
Answer: D - In a diode schematic, the arrow (anode) points toward the cathode lead (vertical line), indicating conventional current flow direction.
18. NPN is a_______
- a) IC
- b) GATE
- c) Transistor
- d) Capacitor
Answer: C - NPN is a type of bipolar junction transistor (BJT) with N-type emitter and collector, P-type base.
19. PNP and NPN transistors are same in terms of working_______
- a) TRUE
- b) FALSE
- c) N.A.
- d) N.A.
Answer: B - FALSE. PNP and NPN transistors work oppositely; they have different polarity requirements for biasing.
20. The number 104 capacitor indicates_______
- a) 0.1u
- b) 1000n
- c) 1n
- d) 10n
Answer: A - 104 on a capacitor means 10 × 10^4 pF = 100,000 pF = 0.1µF (microfarads).