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MCQs

Total Questions : 302 | Page 1 of 31 pages
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
  1.    6
  2.    2
  3.    4
  4.    5
 Discuss Question
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
  1.    length of the circuit
  2.    whether supply frequency is 25 Hz or 50 Hz
  3.    amount of load on the circuit
  4.    cross-section of the circuit wires
 Discuss Question
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
  1.    all in parallel
  2.    all in series
  3.    with two parallel pairs in series
  4.    one pair in parallel with the other two in series
 Discuss Question
Answer: Option A. -> all in parallel
Question 4.   If a 'live' conductor of a public supply touches earth metal
  1.    supply voltage will increase
  2.    supply voltage will decrease
  3.    no current will flow
  4.    current will flow to earth
 Discuss Question
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.
  1.    25
  2.    50
  3.    100
  4.    200
 Discuss Question
Answer: Option A. -> 25
Question 6.  When a low resistance is connected in parallel with a high resistance, the combined resistance is
  1.    always more than the high resistance
  2.    always less than the low resistance
  3.    always between the value of high and low resistance
  4.    either lower or higher than low resistance depending on the value of high resistance
 Discuss Question
Answer: Option B. -> always less than the low resistance
Question 7.   For current to flow, a circuit must be
  1.    isolated
  2.    insulated
  3.    complete
  4.    protected
 Discuss Question
Answer: Option C. -> complete
Question 8.  Kirchhoff's voltage law is not valid for a non-linear network
  1.    TRUE
  2.    FALSE
  3.    both
  4.    none
 Discuss Question
Answer: Option B. -> FALSE
Question 9.  Electric shock is
  1.    always fatal
  2.    never fatal
  3.    sometimes fatal
  4.    always disfiguring
 Discuss Question
Answer: Option C. -> sometimes fatal
Question 10. . A 'short circuit' is that which
  1.    uses short pieces of wire
  2.    goes only a short distance
  3.    is used for dimming light
  4.    offers very low resistance path for current to flow
 Discuss Question
Answer: Option D. -> offers very low resistance path for current to flow

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