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MCQs

Total Questions : 219 | Page 20 of 22 pages
Question 191. In a lamp load when more than one lamp are switched on the total resistance of the load
  1.    Increases
  2.    None of these
  3.    Decreases
  4.    Remains same
 Discuss Question
Answer: Option C. -> Decreases
Question 192. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
  1.    1
  2.    0.6
  3.    1.5
  4.    0.5
 Discuss Question
Answer: Option D. -> 0.5
Question 193. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
  1.    1.0 ohm
  2.    0.6 ohm
  3.    0.4 ohm
  4.    0.8 ohm
 Discuss Question
Answer: Option C. -> 0.4 ohm
Question 194. Voltage dependent resistors are used
  1.    For inductive circuits
  2.    To suppress surges
  3.    As current stabilizers
  4.    As heating elements
 Discuss Question
Answer: Option B. -> To suppress surges
Question 195. The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is
  1.    Negative
  2.    Zero
  3.    About 2 ohms per degree
  4.    Positive
 Discuss Question
Answer: Option D. -> Positive
Question 196. A 3 Q resistor having 2 A current will dissipate the power of
  1.    8 watts
  2.    6 watts
  3.    2 watts
  4.    4 watts
 Discuss Question
Answer: Option B. -> 6 watts
Question 197. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
  1.    64 Q
  2.    48 Q
  3.    36 Q
  4.    18 Q
 Discuss Question
Answer: Option C. -> 36 Q
Question 198. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
  1.    40 W lamp will fuse
  2.    Both lamps will glow equally bright
  3.    100 W lamp will glow brighter
  4.    40 W lamp will glow brighter
 Discuss Question
Answer: Option D. -> 40 W lamp will glow brighter
Question 199. One Newton meter is same as
  1.    One joule
  2.    Five joules
  3.    One watt
  4.    One joule second
 Discuss Question
Answer: Option A. -> One joule
Question 200. Temperature coefficient of resistance is expressed in terms of
  1.    ohms/ohm°C
  2.    ohms/°C
  3.    mhos/ohm°C
  4.    mhos/°C
 Discuss Question
Answer: Option A. -> ohms/ohm°C

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