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MCQs

Total Questions : 141 | Page 14 of 15 pages
Question 131. A voltmeter has a sensitivity of 1000 Ω/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The apparent resistance of the unknown resistor will be?
  1.    20 kΩ
  2.    21.43 kΩ
  3.    18.57 kΩ
  4.    22.36 kΩ
 Discuss Question
Answer: Option A. -> 20 kΩ
Answer: (a).20 kΩ
Question 132. A voltmeter has a sensitivity of 1000 Ω/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The actual resistance of the unknown resistor will be?
  1.    20 kΩ
  2.    18.57 kΩ
  3.    21.43 kΩ
  4.    22.76 kΩ
 Discuss Question
Answer: Option C. -> 21.43 kΩ
Answer: (c).21.43 kΩ
Question 133. Ra and Rd are the opposite arms of a Wheatstone bridge as are Rc and Rb. The source voltage is applied across Ra and Rc. Then when the bridge is balanced which one of the following is true?
  1.    Ra = Rc Rd/Rb
  2.    Ra = Rb Rc/Rd
  3.    Ra = Rb Rd/Rc
  4.    Ra = Rb + Rc + Rd
 Discuss Question
Answer: Option B. -> Ra = Rb Rc/Rd
Answer: (b).Ra = Rb Rc/Rd
Question 134. A 500 A, 50 Hz current transformer has a bar primary. The secondary burden is a pure resistance of 1 Ω and it draws a current of 5 A. If the magnetic core requires 250 Ampere-turn for magnetization, the percentage ratio error is __________
  1.    10.56%
  2.    -10.56%
  3.    11.80%
  4.    -11.80%
 Discuss Question
Answer: Option B. -> -10.56%
Answer: (b).-10.56%
Question 135. A voltmeter has a sensitivity of 1000 Ω/V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The error due to the loading effect of the voltmeter is ________
  1.    3.33%
  2.    6.67%
  3.    13.34%
  4.    13.67%
 Discuss Question
Answer: Option B. -> 6.67%
Answer: (b).6.67%
Question 136. In the Wheatstone bridge shown below, if the resistance in each arm is increased by 0.05%, then the value of Vout will be ________In The Wheatstone Bridge Shown Below, If The Resistance In E...
  1.    50 mV
  2.    Zero
  3.    5mV
  4.    0.1mV
 Discuss Question
Answer: Option B. -> Zero
Answer: (b).Zero
Question 137. Unit of voltage sensitivity is _________
  1.    volts per degrees
  2.    amps per ohms
  3.    degrees per volts
  4.    watts per amps
 Discuss Question
Answer: Option C. -> degrees per volts
Answer: (c).degrees per volts
Question 138. Bridge sensitivity is defined as _________
  1.    \(S_B=\frac{\theta}{R}\)
  2.    \(S_B=\frac{\theta}{\Delta R}\)
  3.    \(S_B=\frac{1}{\frac{\Delta R}{R}}\)
  4.    \(S_B=\frac{\theta}{\frac{\Delta R}{R}}\)
 Discuss Question
Answer: Option D. -> \(S_B=\frac{\theta}{\frac{\Delta R}{R}}\)
Answer: (d).\(S_B=\frac{\theta}{\frac{\Delta R}{R}}\)
Question 139. The source of error in a Wheatstone bridge is due to _________
  1.    range of galvanometer used
  2.    type of the source of emf used
  3.    limiting errors of the three known resistances
  4.    balance condition
 Discuss Question
Answer: Option C. -> limiting errors of the three known resistances
Answer: (c).limiting errors of the three known resistances
Question 140. The Wheatstone bridge is used for the measurement of _________
  1.    1ῼ to a few megaohms
  2.    1kῼ to a few megaohms
  3.    1Mῼ to a few gigaohms
  4.    1mῼ to a few ohms
 Discuss Question
Answer: Option A. -> 1ῼ to a few megaohms
Answer: (a).1ῼ to a few megaohms

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