The ohmmeter is an electrical instrument that measures electrical resistance. Given below are Electrical Engineering MCQ on Ohmmeter.
An Ohmmeter Measures
An ohmmeter measures:
- Current
- Voltage
- Resistance
- Power
Correct answer: 3. Resistance
The type of Ohmmeter which measures extremely small values of resistance
____________ is the type of Ohmmeter which measures extremely small values of resistance:
- Mini ohmmeter
- Micro ohmmeter
- Mega ohmmeter
- None of these
Correct answer: 2. Micro-ohmmeter
The micro-ohmmeter is a type of ohmmeter that can be used to measured extremely small values of resistance.
An ohmmeter connected to a closed switch will display
An ohmmeter connected to across a closed switch will display around:
- 0 ohms
- 1k ohms
- 100k ohms
- 1000k ohms
Correct answer: 1. 0 ohms
An ohmmeter connected across an open switch will display
An ohmmeter connected across an open switch will display:
- 0 ohms
- 100 ohms
- 50 kohms
- 0L
Correct answer: 4. 0L
0L indicates very high (out of range of ohmmeter) or open loop. An open-loop has infinite resistance.
Before Using Ohmmeter one should ensure
Before Using Ohmmeter one should ensure:
- Circuit is de-energized
- Component under testing is isolated
- Proper range is selected
- All of these
Correct answer: 4. All of these
For resistance measurement the component under test should be isolated as well as there should be no other source connected across it. Accordingly the proper selection of resistance ensures more precision in readings.