ESE (IES)Electronics & Communication Engineering TECHNICAL 2017

Consider the following statements: 1) Type-I superconductors undergo abrupt transition to the normal state above a critical magnetic field. 2) Type-II superconductors are highly technologically useful super-conductors because the incidence of a second critical field in them is useful in the preparation of high field electromagnets. Which of the above statements is/are correct?

Consider the following statements: 1) Metal conductors have more R at higher temperatures. 2) Tungsten can be used as a resistance wire. 3) A superconductive material is one which has practically zero resistance. Which of the above statements are correct?

Consider the following statements regarding precision in measurements of a quantity: 1) Precision is the measure of the spread of the incident errors. 2) precision is independent of the realizable correctness of the measurement. 3) Precision is usually described in terms of number of digits used in the measurement by a digital instrument. Which of the above statements are correct?

Consider the following statements in connection with deflection-type and null-type instruments: 1) Null-type instruments are more accurate than the deflection-type ones. 2) Null-type of instrument can be highly sensitive compared to a deflection-type instrument. 3) Under dynamic conditions, null-type instruments are less preferred to deflection type instruments. 4) Response is faster in null-type instruments as compared to deflection-type instruments. Which of the above statements are correct?

A voltmeter having a sensitivity of reads 100 V on its 150 V scale when connected across at resistor of unidentified specifications in series with a milliammeter. When the milliammeter reads 5 mA, the error due to the loading effect of the voltmeter will be nearly

Consider the following statements: Sphere gap method of voltage measurement is used 1) for measuring r.m.s. value of a high voltage 2) for measuring peak value of a high voltage 3) as the standard for calibration purposes Which of the above statements are correct?