MENSURATION & INSTRUMENTATION MCQS SET 07

MENSURATION & INSTRUMENTATION MCQS SET 07

1)   Swamping resistance is a resistance made up of
a. Alloy of manganin and copper
b. Alloy of aluminium and copper
c. Alloy of nickel and cobalt
d. Alloy of manganin and aluminium
ANSWER: Alloy of manganin and copper
 

2)   In a moving coil of a meter swamping resistance is added to
a. Reduce the frequency error
b. Reduce the temperature error
c. Reduce the power consumption
d. All of these
ANSWER: Reduce the temperature error
 

3)   Which among the following is not true about the induction instruments?
a. It can be used for ac measurements only
b. Damping is very efficient in case of induction instruments
c. Compensation for frequency temperature is not required
d. Cost is relatively high
ANSWER: Compensation for frequency temperature is not required
 

4)   The temperature errors in induction instruments can be compensated by
a. Hunting in both ammeters and voltmeters
b. Combination of shunt and swamping resistance in both ammeters and voltmeters
c. Hunting in case of ammeters and Combination of shunt and swamping resistance in case of voltmeters
d. Combination of shunt and swamping resistance in case of ammeters and hunting in case of voltmeters
ANSWER: Hunting in case of ammeters and Combination of shunt and swamping resistance in case of voltmeters
 

5)   The frequency errors in induction instruments can be compensated by the use of
a. Non inductive shunt in both ammeters and voltmeters
b. Non inductive shunt in case of ammeters and are generally self compensated in case of voltmeters
c. Self compensated in case of both ammeters and voltmeters
d. Self compensated in case of ammeters and non inductive shunt in case of voltmeters
ANSWER: Non inductive shunt in case of ammeters and are generally self compensated in case of voltmeters
 

6)   For reducing the errors in an induction instrument the alternating current to be measured has
a. Same frequency with which the instrument was calibrated
b. High frequency compared with which the instrument was calibrated
c. Low frequency compared with which the instrument was calibrated
d. None of these
ANSWER: Same frequency with which the instrument was calibrated
 

7)   In induction voltmeter, split phase windings are obtained by connecting a
a. High resistances in series with windings of both the magnets
b. High resistance in series with the winding of one magnet and an inductive coil in series with the windings of other magnet
c. An inductive coil in series with the winding of one magnet and a capacitance in series with the windings of other magnet
d. Inductive coils in series with the winding of both the magnets
ANSWER: High resistance in series with the winding of one magnet and an inductive coil in series with the windings of other magnet
 

8)   A cylindrical type with split phase winding induction ammeters employs
a. A rotating disc
b. A hollow aluminium drum
c. A single flux producing winding
d. Either (a) or (b)
ANSWER: A hollow aluminium drum
 

9)   Induction type instruments are generally used as
a. Ammeter
b. Voltmeter
c. Wattmeter
d. All of these
e. None of these
ANSWER: All of these
 

10)   Damping torque is the torque which acts on
a. Stationary system of the instrument
b. Moving system of the instrument only when it is stationary
c. Moving system of the instrument only when it is moving
d. Stationary system of the instrument only when the moving system is moving
ANSWER: Moving system of the instrument only when it is moving