Q. The principle of Hall effect is made use of in the construction of which one of the following?
a. Ammeter
b. Voltmeter
c. Gaussmeter
d. Galvanometer
Q. How can a milli-ammeter be used as a voltmeter ?
a. By connecting a low resistance in parallel with the instrument
b. By connecting a high resistance in parallel with the instrument
c. By connecting a low resistance in series with the instrument
Q. What is the ‘swamping’ resistance which is connected in series with the working coil of a voltmeter to drastically reduce the error in measurement caused due to variation in temperature, made of?
a. Constantan
b. Eureka
c. Manganin
Q. Which one of the following is used for the measurement of 3-phase power factor?
(a) Power factor meter
(b) Crosse coil power factor meter
(c) Phase-angle waft hour meter
(d) Polarised-vane power factor meter
Q. What is clamp-on ammeter used for ?
(a) Low a.c. current
(b) High a.c. current
(c) Low d.c. current
(d) High d.c. current
Q. Which one of the following instruments is commonly used to measure primary current of a transformer connected to mains?
(a) Electrostatic meter
(b) Current transformer
(c) Moving coil type meter
(d) Moving iron meter
Q. What is the prefix tera equivalent to?
(a) 103
(b) 106
(c) 109
(d) 1012
Q. The errors introduced by an instrument fall in which category?
(a) Systematic errors
(b) Random errors
(c) Gross errors
(d) Environmental errors
Q. Which of the following is/are primary standard(s) for voltage maintained by National Standards Laboratories?
1. Zener diode with 1.5 V output at 20°C
2. Nickel cadmium rechargeable cell of 1.25 V output at 20 °C
Q. Which one of the following passive components has the most precise and accurate standard ?
a. Resistance
b. Inductance
c. Capacitance
d. Conductance.
