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MCQ
1401. An ohmmeter is a---
Moving iron instrument
Moving coil instrument
Dynamometer instrument
None of the above
1402. Commonly used instruments in power system measurement are-
Induction
Rectifier
Moving coil or iron
Electrostatic
ব্যাখ্যা: Induction type instruments are commonly used in power system measurement. These types of instruments are used only for AC measurements.
1403. The internal resistance of an ammeter should be-
Very small
High
Medium
Infinity
1404. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at----
0°
60°
90°
120°
ব্যাখ্যা: ডায়ানামোমিটার টাইপ পাওয়ার ফ্যাক্টর মিটারে দুটি প্রেসার কয়েলের প্ল্যানের মধ্যবর্তী কোণ 90° এবং 3- power factor meter প্রেসার সার্কিটদ্বয়ের মধ্যবর্তী কোণ 120°
1405. In order to achieve high accuracy, the slide wire of a potentiometer should be-
As long as possible
As short as possible
Neither too small nor too large
Very thick
1406. A direct current can be measured by-
AD.C. potentiometer directly
A D.C. potentiometer in conjunction with a standard resistance
A D.C. potentiometer in conjunction with a volt ratio box
None of the above
1407. An ohmmeter is an instrument for measuring-
current
resistance
voltage
wattage
1408. Direct method is used to measure-
Length
Pressure
Temperature
Voltage
ব্যাখ্যা: Direct method is used to measure length.
1409. Resistances can be measured with the help of-
Watt-meters
Voltmeters
Ammeters
Ohmmeters and resistance bridges
1410. Ampere is one of the-
Supplementary units
Derived units
Base units
Units used to measure charge
ব্যাখ্যা: Current unit is Ampere. Ampere is SI base unit.
1411. An instrument transformer is used to extend the range of-
Induction instrument
Electrostatic instrument
Moving coil instrument
Any of the above
1412. In a moving coil instrument, the deflecting torque is proportional to-
Current
Square of the current
Squareroot of the current
Sine of the measurand
ব্যাখ্যা: একটি ইনস্ট্রুমেন্টের ডিফ্লেকটিং টর্ক (To), যে কারেন্ট (1) পরিমাণ করতে হবে তার সাথে সরাসরি সমানুপাতিক।
1413. For measurement of inductance having high value, we should use-
Maxwell's bridge
Maxwell Wien bridge
Hay's bridge
Any of the above
ব্যাখ্যা: The Hay's bridge is used for determining the self- inductance of the circuit. The bridge is the advanced from of maxwell's bridge. The maxwell's bridge is only appropriate for measuring the medium quality factor. For measuring the high quality factor the Hay's bridge is used in the circuit
1414. Most sensitive galvanometer is-
Elastic galvanometer
Vibration galvanometer
Duddlb galvanometer
Spot ballistic galvanometer
1415. A dynamometer wattmeter can be used for-
DC only
AC only
Both DC and AC
Any of the above
1416. The operating voltage of a Meggar is about-
6V
12V
40V
100V
ব্যাখ্যা: আমাদের দেশে সাধারণতঃ 500V, 1000V, 2000V-এর মেগার পাওয়া যায়। টেস্ট ভোল্টেজ অনুযায়ী মেগার ইনসুলেশন 'টেস্টার' বিভিন্ন প্রকারের হয়ে থাকে। যথা- 100V, 250V, 500V, 1000V, 2500V, 10,000V.
1417. The disc of an instrument using eddy current damping should be of-
Conducting and magnetic material
Non-conducting and magnetic material
Conducting and nonmagnetic material
None of the above
ব্যাখ্যা: Eddy current damping uses conducting and nonmagnetic material.
1418. In an energy meter braking torque is produced to--
Safeguard it against creep
Brake the instrument
Bring energy meter to stand still
Maintain steady speed and equal to driving torque
ব্যাখ্যা: In an energy meter, a barking torque is produced to maintain a steady speed and equal to driving torque. A permanent magnet positioned near the edge of the aluminum disc from the braking system.
1419. Ryall crest voltmeter is used for measurement of--
AC voltage of any form
Low-frequency voltage
High-DC voltage
High-AC voltage
ব্যাখ্যা: High AC voltage measurement used Ryall crest voltmeter,
1420. An oscilloscope indicates-
Peak to peak value of voltage
DC value of voltage
RMS value
Average value
ব্যাখ্যা: The automatic measurement of various parameters of the signal, like its frequency, peak-to-peak voltage, duty cycle and rise time.