A dynamometer wattmeter is connected in ac circuit. The reading will be V-A prod

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Measurements and Instrumentation Comments

Question
A dynamometer wattmeter is connected in ac circuit. The reading will be
Options
A. V-A product
B. average power
C. peak power
D. instantaneous power

Correct Answer

average power

Explanation

Wattmeter measures average power over a cycle.

Measurements and Instrumentation problems

Search Results

1. A meter with a resistance of 100 ? and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be
Options
A. 490 ?
B. 5000 ?
C. 4900 ?
D. 5100 ?

2. A dynamometer wattmeter is connected in ac circuit. The measured power is
Options
A. rms power
B. average power
C. peak power
D. instantaneous power

4. In a strain measuring device using a strain gauge, the output quantity is
Options
A. voltage
B. resistance
C. impedance
D. either (a) or (b)

5. In a ballistic galvanometer, a charge of 100 ?C gives a first swing of 25�. The charge required to cause first swing of 50� is
Options
A. 200 ?C
B. 400 ?C
C. 50 ?C
D. 25 ?C

7. Which of the following voltmeters would you use for measuring voltage across 20 k? resistance?
Options
A. Voltmeter having a resistance of 5 k?
B. Voltmeter having a sensitivity of 1 kW/V
C. Voltmeter having sensitivity of 10 kW/V
D. None of the above

8. Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
Options
A. it loads the circuit to maximum extent
B. it loads the circuit moderately
C. it does not load the circuit at all
D. it uses centre zero galvanometer instead of Voltmeters

9. In a thermocouple temperature transducer, the output voltage is usually measured by
Options
A. high resistance ammeter
B. high resistance voltmeter
C. high resistance milli-voltmeter
D. none of the above

10. A digital frequency counter can be converted to DVM by addition of a suitable
Options
A. voltage controlled oscillator
B. D/A converter
C. power amplifier
D. operational amplifier

Comments

There are no comments.

More in Electronics and Communication Engineering: