Basic Electrical Engineering (3110005) MCQs

MCQs of DC Circuits

Showing 51 to 60 out of 137 Questions
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51.
A lamp of 100 W at 200 V is supplied current at 100 volts. It will be equivalent to the lamp of
(a) 50 W
(b) 40 W
(c) 25 W
(d) 10 W
Answer:

Option (c)

52.
For a fixed supply voltage the current flowing through a conductor will decrease when
(a) cross-sectional area of the conductor is increased
(b) length of the conductor is increased
(c) length of the conductor is reduced
(d) cross-sectional area is increased and length is decreased
Answer:

Option (b)

53.
Ohm's law is not applicable in all the following cases except
(a) Electrolysis
(b) Arc lamps
(c) Insulators
(d) Vacuum radio valves
Answer:

Option (c)

54.
In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etcetera?
(a) Voltage
(b) Current
(c) Both voltage and current
(d) Neither voltage nor current
Answer:

Option (b)

55.
Many resistors connected in series will?
(a) Divide the voltage proportionally among all the resistors
(b) Divide the current proportionally
(c) Increase the source voltage in proportion to the values of the resistors
(d) Reduce the power to zero
Answer:

Option (a)

56.
What happens to the current in the series circuit if the resistance is doubled?
(a) It becomes half its original value
(b) It becomes double its original value
(c) It becomes zero
(d) It becomes infinity
Answer:

Option (a)

57.
If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?
(a) The other bulb blows out as well
(b) The other bulb continues to glow with the same brightness
(c) The other bulb glows with increased brightness
(d) The other bulb stops glowing
Answer:

Option (b)

58.
In a parallel circuit, with a number of resistors, the voltage across each resistor is ________
(a) The same for all resistors
(b) Is divided equally among all resistors
(c) Is divided proportionally across all resistors
(d) Is zero for all resistors
Answer:

Option (a)

59.
The currents in the three branches of a parallel circuit are 3A, 4A and 5A. What is the current leaving it?
(a) 0 A
(b) Insufficient data provided
(c) The largest one among the three values
(d) 12 A
Answer:

Option (d)

60.
It is preferable to connect bulbs in series or in parallel?
(a) Series
(b) Parallel
(c) Both series and parallel
(d) Neither series nor parallel
Answer:

Option (b)

Showing 51 to 60 out of 137 Questions
3 4 5 6 7 8