MCQ in Electrical Circuit Part 15 | ECE Board Exam

(Last Updated On: November 24, 2020)

This is the Multiples Choice Questions Part 15 of the Series in Electrical Circuit as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in AC-DC circuits
• MCQ in Resistors
• MCQ in Inductors
• MCQ in Capacitors

Continue Practice Exam Test Questions Part 15 of the Series

Choose the letter of the best answer in each questions.

701. The hot resistance of an incandescent lamp is 10 ohms and the rated voltage is 50 V. Find the series resistance required to operate the lamp from an 80 V supply.

A. 8 ohms

B. 4 ohms

C. 6 ohms

D. 10 ohms

702. Ohm’s law is not applicable to

A. copper

B. silver

C. silicon carbide

D. aluminum

703. The practical unit of electrical energy is

A. watt

B. kilowatt

C. kilowatt-hour

D. megawatt

704. A 100 watt lamp working for 20 hours will consume ________ units.

A. 200

B. 20

C. 2

D. 5

705. The hot resistance of an incandescent lamp is about ________ its cold resistance.

A. 10 times

B. 2 times

C. 100 times

D. 50 times

706. A d.c. circuit usually has _________ as the load.

A. resistance

B. inductance

C. capacitance

D. both inductance and capacitance

707. The purpose of load in an electric circuit is to __________.

A. increase the circuit current

B. utilize electrical energy

C. decrease the circuit current

D. none of the above

708. Electrical appliances are not connected in series because __________

A. series circuit is complicated

B. appliances have different current rating

C. power loss is more

D. none of the above

709. Electrical appliances are connected in parallel because it _________

A. is a simple circuit

B. draws less current

C. results in reduce in power loss

D. makes the operation of appliances independent of each other

710. Inductance and capacitance are not relevant in a d.c. circuit because __________

A. frequency of d.c. is zero

B. it is a simple circuit

C. they do not exist in a d.c. circuit

D. none of the above

711. The hot resistance of a 100 watt, 250 V incandescent lamp would be

A. 2.5 ohms

B. 625 ohms

C. 25 ohms

D. none of the above

712. The voltage drop across 14.5 ohm resistor in Fig. 15.1 is __________.

A. 29 V

B. 14 V

C. 30.5 V

D. 18 V

713. The circuit shown in Fig. 15.1 is called a series circuit because ________

A. it contains a few resistances

B. it carries the same current throughout the circuit

C. it is a simple circuit

D. none of the above

714. Referring to Fig. 15.2, the total circuit resistance will be _________

A. 1000 ohms

B. 400 ohms

C. 1400 ohms

D. 135 ohms

715. In Fig. 15.2 ____

A. the lamp A will be brighter than lamp B

B. the lamp B will be brighter than lamp A

C. the two lamps will be equally bright

D. none of the above

716. When a number of resistances are connected in parallel, the total resistance is _______

A. less than the smaller resistance

B. greater than the smaller resistance

C. between the smaller and greatest resistance

D. none of the above

717. Two resistances of 6 ohms and 3 ohms are connected in parallel. The total resistance is ________

A. 9 ohms

B. 18 ohms

C. 0.5 ohm

D. 2 ohms

718. The value of R that will give a total resistance of 1.5 ohms in Fig. 15.3 is ____

A. 4 ohms

B. 6 ohms

C. 3 ohms

D. 9 ohms

719. The current in 2.5 ohm resistor in Fig. 15.4 will be _________

A. 3 A

B. 4.5 A

C. 2.5 A

D. 2 A

720. The current in 4.5 ohms resistor in Fig. 15.4 will be _________.

A. 3.5 A

B. 3 A

C. 2 A

D. 2.5 A

721. If 18 resistances, each of value 36 ohms, are connected in parallel, then the total resistance is _________

A. 2 ohms

B. 54 ohms

C. 36 ohms

D. none of the above

722. Two incandescent lamps of 100 W, 200 V are in parallel across 200 V supply. The total resistance will be _______.

A. 800 ohms

B. 200 ohms

C. 400 ohms

D. 600 ohms

723. The resistance across the terminals AB of the circuit shown in Fig. 15.5 is ________

A. 36 ohms

B. 18 ohms

C. 9 ohms

D. 15 ohms

724. If a d.c. supply of 180 V is connected across terminals AB in Fig. 15.5, then current in 6 ohm resistor will be _________.

A. 10 A

B. 5 A

C. 12 A

D. 6 A

725. The resistance across terminals AC in Fig. 15.5 is ________

A. 36 ohms

B. 9 ohms

C. 18 ohms

D. 8 ohms

726. The resistance across terminals AB of the circuit shown in Fig. 15.6 is ________

A. 4 ohms

B. 18 ohms

C. 34 ohms

D. 8 ohms

727. If a battery of 24 V is applied across terminals AB of the circuit shown in Fig. 15.6, then current in 2 ohm resistor will be ________

A. 3 A

B. 6 A

C. 2.5 A

D. 1.5 A

728. If a battery of 24 V is applied across terminals AB in Fig. 15.6, then power loss in 5 ohms resistor will be ________

A. 180 W

B. 45 W

C. 90 W

D. 24 W

729. The total conductance of the circuit shown in Fig. 15.7 is ________

A. 13 mhos

B. 1.6 mhos

C. 6 mhos

D. 2.5 mhos

730. If 10 ohms resistance is removed in Fig. 15.7, then total conductance of the circuit will be ________

A. 3 mhos

B. 6 mhos

C. 2 mhos

D. 1.5 mhos

731. The voltage across the parallel circuit shown in Fig. 15.8 is ________

A. 15 V

B. 10 V

C. 30 V

D. 12. 5 V

732. The current in 10 ohms resistor in Fig. 15.8 is ________

A. 3 A

B. 2.5 A

C. 1.5 A

D. 3.5 A

733. The total resistance between terminals 1 and 2 of the circuit shown in Fig. 15.9 is _______

A. 12 ohms

B. 2.67 ohms

C. 2 ohms

D. 64 ohms

734. If a battery of 12 V is applied across terminals 1 and 2 of Fig. 15.9, then current through 4 ohms resistor will be ________

A. 1.5 A

B. 3 A

C. 2 A

D. 2.5 A

735. The resistance between terminals 1 and 2 of Fig. 15.10 is _________

A. 12 ohms

B. 8 ohms

C. 16 ohms

D. 3 ohms

736. The resistance between terminals 1 and 2 in Fig. 15.11 is ________

A. 2 ohms

B. 1.5 ohms

C. 1 ohm

D. 4 ohms

237. If a battery of 6 V is applied across terminals 1 and 2 in Fig. 15.11, then current in the horizontal 2 ohm resistor will be ________

A. 1 A

B. 2 A

C. 3 A

D. 0.5 A

738. The resistance across terminals 1 and 2 in Fig. 15.12 is _________

A. 6 ohms

B. 12 ohms

C. 18 ohms

D. 24 ohms

739. Two equal resistances are connected in series across a certain supply. If the resistances are now connected in parallel across the same supply, the power produced will be ________ that of series connection.

A. two times

B. four times

C. one-half

D. one-fourth

740. Referring to Fig. 15.13, the resistance across terminals BE is ________

A. 9 ohms

B. 18 ohms

C. 10 ohms

D. none of the above

741. Referring to Fig. 15.13, the resistance across terminals AF is ________

A. 20.5 ohms

B. 18 ohms

C. 11 ohms

D. none of the above

742. Referring to Fig. 15.13, the current in 18 ohms resistor will be ________

A. 2 A

B. 1.5 A

C. 1 A

D. none of the above

743. Referring to Fig. 15.13, the power loss in 11 ohms will be ______

A. 11 W

B. 24 W

C. 16 W

D. none of the above

744. If in Fig. 15.14, switches S1 and S2 are closed, then total circuit resistance is _______

A. 400 ohms

B. 1200 ohms

C. 1000 ohms

D. 2400 ohms

745. If switch S1 is open and switch S2 is closed in Fig. 15.14, then circuit resistance will be _________

A. 1200 ohms

B. 1000 ohms

C. 1400 ohms

D. 2400 ohms

746. If in Fig. 15.14, both switches S1 and S2 are closed, then ________

A. L1 will be brighter than L2 or L3

B. L1 will be dimmer than L2 or L3

C. L1 will be as bright as L2 or L3

D. none of the above

747. If in Fig. 15.14 switches S1 and S2 are open, then lamp L1 will give output _______

A. less than 40 W

B. more than 40 W

C. equal to 40 W

D. none of the above

748. If in Fig. 15.14 switches S1 and S2 are closed and the supply voltage is increased to 400 V, then ________

A. lamp L1 will burn out

B. lamp L2 will burn out

C. both lamps L2 and L3 will burn out

D. all the lamps will be safe

749. If in Fig. 15.15, resistor R2 becomes open-circuited, the reading of the voltmeter will become

A. zero

B. 150 V

C. 50 V

D. 200 V

750. Whatever the battery voltage in Fig. 15.16, it is certain that smallest current will flow in the resistance of ______ ohm.

A. 300

B. 500

C. 200

D. 100

Questions and Answers in Electrical Circuit

Following is the list of practice exam test questions in this brand new series:

Complete List of MCQ in Electronics Engineering per topic