Basic Concept Of Electricity(Engineering > Electrical Engineering ) Questions and Answers
Question 1. Two wires A and B have the same cross-section and are made of the same material. RA = 600 LI and RB = 100 The number of times A is longer than B is
6
2
4
5
Explanation:-
Answer: Option A. -> 6
Question 2. The factor which will have least effect on the voltage at the load end of a two-wire supply circuit is
length of the circuit
whether supply frequency is 25 Hz or 50 Hz
amount of load on the circuit
cross-section of the circuit wires
Explanation:-
Answer: Option B. -> whether supply frequency is 25 Hz or 50 Hz
Question 3. For a given line voltage, four heating coils will produce maximum heat when connected
all in parallel
all in series
with two parallel pairs in series
one pair in parallel with the other two in series
Explanation:-
Answer: Option A. -> all in parallel
Question 4. If a 'live' conductor of a public supply touches earth metal
supply voltage will increase
supply voltage will decrease
no current will flow
current will flow to earth
Explanation:-
Answer: Option D. -> current will flow to earth
Question 5. Two 100 W, 200 V lamps are connected in series across a 200 V supply. The total power consumed by each lamp will be-watts.
25
50
100
200
Explanation:-
Answer: Option A. -> 25
Question 6. When a low resistance is connected in parallel with a high resistance, the combined resistance is
always more than the high resistance
always less than the low resistance
always between the value of high and low resistance
either lower or higher than low resistance depending on the value of high resistance
Explanation:-
Answer: Option B. -> always less than the low resistance
Question 7. For current to flow, a circuit must be
isolated
insulated
complete
protected
Explanation:-
Answer: Option C. -> complete
Question 8. Kirchhoff's voltage law is not valid for a non-linear network
TRUE
FALSE
both
none
Explanation:-
Answer: Option B. -> FALSE
Question 9. Electric shock is
always fatal
never fatal
sometimes fatal
always disfiguring
Explanation:-
Answer: Option C. -> sometimes fatal
Question 10. . A 'short circuit' is that which
uses short pieces of wire
goes only a short distance
is used for dimming light
offers very low resistance path for current to flow
Explanation:-
Answer: Option D. -> offers very low resistance path for current to flow