Q. Holding current in PNPN diode is the ?
  • (A) gate current required to keep the device ON
  • (B) minimum current to keep the, SCR ON
  • (C) current at breakover point
  • (D) minimum current to keep the device OFF
💬 Discuss
✅ Correct Answer: (B) minimum current to keep the, SCR ON
Q. Most SCRs can be turned off by voltage reversal during negative half cycle of the A.C. supply for ?
  • (A) all frequencies
  • (B) frequencies upto 200 Hz
  • (C) frequencies upto 30 kHz
  • (D) none of the above
💬 Discuss
✅ Correct Answer: (B) frequencies upto 200 Hz
Q. A voltmeter must have very high internal resistance so that ?
  • (A) Accuracy is high
  • (B) Resolution is high
  • (C) Draws small amount of current
  • (D) Creates high loading effect circuit
💬 Discuss
✅ Correct Answer: (C) Draws small amount of current
Q. Errors which may be variable both in magnitude and nature (positive or negative) are classified as ............. error ?
  • (A) Hysteresis
  • (B) Random
  • (C) Interaction
  • (D) Systematic
💬 Discuss
✅ Correct Answer: (B) Random
Q. The use of ........ instruments is merely confined within laboratories instruments. as standardizing ?
  • (A) Absolute
  • (B) Indicating
  • (C) Recording
  • (D) Integrating
💬 Discuss
✅ Correct Answer: (A) Absolute
Q. To reduce the loading effect, an instrument must possess ?
  • (A) Zero input impedance
  • (B) Unit input impedance
  • (C) High input impedance
  • (D) Low input impedance
💬 Discuss
✅ Correct Answer: (C) High input impedance
Q. An oscilloscope is basically designed to convert ?
  • (A) Visual signals to electrical signals
  • (B) Sound signals to electrical signals
  • (C) Electrical signals to visual signals
  • (D) Sound signals to visual signals
💬 Discuss
✅ Correct Answer: (C) Electrical signals to visual signals
Q. A CRO cannot be used for direct measurement of CRO ?
  • (A) Voltage
  • (B) Current
  • (C) Frequency
  • (D) Power
💬 Discuss
✅ Correct Answer: (D) Power
Q. The accuracy of null type instruments generally ............ Deflection type instruments ?
  • (A) equal to
  • (B) less than
  • (C) greater than
  • (D) uncomparable to
💬 Discuss
✅ Correct Answer: (C) greater than
Q. Which of the following essential features is possessed by an indicating instrument ?
  • (A) Deflecting device
  • (B) Controlling device
  • (C) Damping device
  • (D) Deflecting, Controlling & Damping device
💬 Discuss
✅ Correct Answer: (D) Deflecting, Controlling & Damping device

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