Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is p

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Question
Assertion (A): A hot wire ammeter has a cramped scale.
Reason (R): The heat is proportional to square of current.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

Correct Answer

Both A and R are true and R is correct explanation of A

Explanation

Since heating ? I², scale is cramped.

Measurements and Instrumentation problems

Search Results

1. If reference sound pressure P₀ is 2 x 10^-5 N/m², a sound pressure of 90 dB is equal to
Options
A. 0.632 N/m²
B. 0.707 N/m²
C. 0.835 N/m²
D. 0.925 N/m²

2. A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make
Options
A. 1200 revolutions
B. 1800 revolutions
C. 2100 revolutions
D. 2400 revolutions

3. In which of the transformer is the secondary nearly short circuited under normal operating conditions?
Options
A. CT
B. PT
C. Distribution transformer
D. Power transformer

4. Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.
Reason (R): A wattmeter measures apparent power.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true

5. 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

6. Consider the following statements: In a differential amplifier using JFET, the differential output offset is due to
1. mismatch between FET parameters
2. difference in values of resistances used in circuit
3. variation in supply voltage.
Of the statements, the correct statements are
Options
A. 1 and 2
B. 1, 2, 3
C. 2, 3
D. 1, 3

7. A full wave rectifier type meter is used to measure the wave shape shown in figure. The voltmeter is calibrated to read rms value of sine wave. The reading of voltmeter will be
Options
A.
B.
C. 100 V
D. 111 V

8. A moving iron instrument gives correct reading when used at
Options
A. low frequencies
B. high frequencies
C. only one frequency
D. all frequencies upto a certain value

10. Which of the following is true about an impulse voltage?
Options
A. It is a unidirectional voltage
B. Chopped impulse flashover does not occur
C. Time taken to rise is equal to time taken to fall
D. RMS value is always less than 50% of average value

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