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2
The magnetizing force at the centre of a circular coil varies
1. Directly as the number of its turns.
2. Directly as the current.
3. Directly as its radius.
4. Inversely as its radius.
Which of the above statements are correct?
3
An uncharged capacitor of 0.01 F is charged first by a current of 2 mA for 30 s and then by a current of 4 mA for 30 s. The final voltage in it will be
4
A capacitor of 10 pF is connected to a voltage source of 100 V. If the distance between the capacitor plates is reduced to 50%, while it remains connected to the 100 V supply, the value of potential gradient in the second case will be
5
Which of the following statements are correct?
1. Accuracy is the closeness with which an instrument approaches the true value of the quantity being measured.
2. Precision is a measure of the reproducibility of the measurement.
3. Precision of an instrument can be improved upon by calibration.
4. Accuracy may be specified in terms of limits of errors.
6
An electrodynamometer instrument can be used as
1. Wattmeter and VAR meter.
2. Power factor meter and frequency meter.
3. Transfer instrument. Which of the above statements are correct?
7
The moving iron instruments when measuring voltages or currents,
8
True RMS-reading voltmeter
1. Measures the RMS value of voltage accurately.
2. Eliminates the error due to waveform.
3. Uses the thermocouple for heating. Which of the above statements are correct?
9
Instrument transformers are
10
The power in a 3-phase circuit is measured with the help of 2-wattmeters; the readings of one of the wattmeters is positive and that of the other is negative. The magnitude of readings is different. It can be concluded that the power factor of the circuit will be
11
In a Q-meter, distributed capacitance of a coil is measured by changing the capacitance of the tuning capacitor. The values of tuning capacitor are C 1 and C 2 for resonant frequencies f 1 and 2 f 1 respectively. The value of distributed capacitance will be
12
In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved by
13
A CRT has an anode voltage of 2000 V and parallel deflecting plates 2 cm long and 5 mm apart. The screen is 30 cm from the centre of the plates. If the input voltage is applied to the deflecting plates through amplifiers having an overall gain of 100, the input voltage required to deflect the beam through 3 cm will be
14
A resistance wire strain gauge with a gauge factor of 2 is bonded to a steel structural member subjected to a stress of 100 MN/m2. The modulus of elasticity of steel is 200 GN/m2. The percentage change in the value of the gauge resistance due to the applied stress will be
15
Capacitive transducers can be used for the measurement of liquid level. The principle of operation used in this case is the change of capacitance with change of
16
The hexadecimal of the binary number (11010011)2 is
17
Which one of the following relations from the Boolean algebra pertaining to, 'AND' operation cannot cannot cannot cannot cannot be verified when A and B can take on only the value 0 or 1?
18
Which of the following design levels of a computer are widely used in computer design?
1. Gate level
2. Processor level
3. Register level
4. User level