Latest TLE Reviewer 20

1. Which is the kinetic energy of falling water?

A. thermo energy

B. hydrogen energy

C. solar energy

D. mechanical energy

ANS: B

2. Which is a solar collector that is capable of producing voltage when exposed to radiant energy (sunlight)?

A. photoelectric

B. Photovoltaic system

C. Photoemission system

D. Solar light

ANS: B

3. Energy derived or extracted from the iternal heat of earth is called ______  energy.

A. volcanic

B. geothermal

C. thermal

D. chemical

ANS: B

4. Which refers to the  extraction of electrons form a substance by sunlight in incident electromagnetic radiation?

A. Photoelectric effect

B. Photovoltaic effect

C. Photoemission

D. Electron microscopy

ANS: A

5.Which statement is true?

A. bigger size of wire has higher resistance

B. bigger size of wire has lower resistance

C. long wire has lesser resistance

D. short wire has higher resistance

ANS: B

6. A small light bulb with a resistance of 1000 ohms is connected across a 120-v line. What is the current through the bulb?

A. 1.2 A

B. 0.012 A

C. 0.12 A

D. 12 A

ANS: C

7. A 200.v lamp ha a resistance of 400 ohms. The power rating in watts of lamp is _____________ .

A. 100w

B. 600w

C. 200w

D. 250w

ANS: A

8. If 18 resistance, each of a value of 36 ohms, are connected in parallel, then the total resistance is _____ .

A. 36 ohms

B. 2 ohms

C. 648 ohms

D. 54 ohms

ANS: B

9. A toaster takes 10A from a 120v line. The power used is ___ .

A. 12.w

B. 130w

C. 1200w

D. 120w

ANS: C

10. What is the of a 100w, 110v incandescent lamp?

A. 121 ohms

B. 115 ohms

C. 125 ohms

D. 12.1 ohms

ANS: A

11. How many kilowatts is the water heater if it draws a current of 10 amperes and ha resistance of 23 ohms?

A. 12 Kw

B. 2 300 Kw

C. 230 Kw

D. 2.3 Kw

ANS: D

12. The resistance of an electrical wire is inversely proportional to its ______.

A. length

B. cross sectional area

C. temperature

D. material

ANS: B

13. A fluorescent lamp unit collected to a 110v AC line takes 1.2A and requires 110w power. What is its power factor?

A. 0.9 Kw

B. 2 300 Kw

C. 230 Kw

D. 2.3 Kw

ANS: B

14. An electric heater uses 20kw-hr 8 hours. If the voltage across the heater is 240 volts. What is the heater resistance?

A. 2.5 ohms

B. 83.3 ohms

C. 23.04 ohms

D. 2.30 ohms

ANS: C

15. The resistance of a 230v incandescent lamp is 300 ohms. What current is required to operate the lamp?

A. 0.85 A

B. 0.77 A

C. 1.30 A

D. 7.74 A

ANS: B

16. A group of lamps operates a current of 12 A and a voltage of 120v. What is the total power of the lamps?

A. 1.44kw

B. 1.20kw

C. 1.34 kw

D. 14.4kw

ANS: A

37. What is the maximum load capacity of 15 A circuit breaker protecting a branch circuits that supplies a continuous load?

A. 15 A

B. 10 A

C. 12 A

D. 14 A

ANS: C

18. What is the horsepower rating of an electric water pump if it has a power rating of 1.75 kw?

A. 2 hp

B.2.3 Hp

C. 2.5 Hp

D. 23Hp

ANS: B

19. How many kilowatts does a certain appliance consumes for 5 hrs. of use if it has a power rating of 1.5Hp

A. 56. Kw

B. 7.5 Kw

C. 5.6 Kw

D. 754 hp

ANS: C

20. A cell supplies a load current 0.5A for a period 20 hours until its terminal voltage falls to an unacceptable level. How long can it be expected to supply a current of 100mA?

A. 50 hours

B. 100 hours

C. 60 hours

D. 70 hours

ANS: B

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