Electrical Basic Questions 10
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Attempt Free Electrical Basic Questions 10 Here. Read The Important Electrical Basic Questions 10 MCQ From Below.
1.The chemical effect of current is used in
a. D.C. ammeter hour meter
b. D.C. ammeter
c. D.C. energy meter
d. none of the above
ANSWER : : D.C. ammeter hour meter
2.Which of the following meters are not used on D.C. circuits
a. Mercury motor meters
b. Commutator motor meters
c. Induction meters
d. None of the above
ANSWER : : Induction meters
3.Which of the following essential features is possessed by an indicating instrument ?
a. Deflecting device
b. Controlling device
c. Damping device
d. All of the above
ANSWER : : All of the above
4. In a portable instrument, the controlling torque is provided by
a. spring
b. gravity
c. eddy currents
d. all of the above
ANSWER : : spring
5._____ instruments are those which measure the total quantity of electricity delivered in a particular time.
a. Absolute
b. Indicating
c. Recording
d. Integrating
ANSWER : : Integrating
Electrical Basic Questions 10
6.Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
a. Absolute instruments
b. Indicating instruments
c. Recording instruments
d. ntegrating instruments
ANSWER : : Indicating instruments
7.In majority of instruments damping is provided by
a. fluid friction
b. spring
c. eddy currents
d. all of the above
ANSWER : : eddy currents
8.For handling greater currents induction wattmeters are used in conjunction with
a. potential transformers
b. current transformers
c. power transformers
d. either of the above
ANSWER : : current transformers
9.A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
a. ammeter
b. voltmeter
c. flux-meter
d. ballistic galvanometer
ANSWER : : ammeter
10.The disc of an instrument using eddy current damping should be of
a. conducting and magnetic material
b. non-conducting and magnetic material
c. conducting and non-magnetic material
d. none of the above
ANSWER : : conducting and non-magnetic material
Electrical Basic Questions 10
11.The pointer of an indicating instrument should be
a. very light
b. very heavy
c. either (a) or (b)
d. neither (a) nor (b)
ANSWER : : very light
12.Most common form of A.C. meters met with in every day domestic and industrial installations are
a. mercury motor meters
b. commutator motor meters
c. induction type single phase energy meters
d. all of the above
ANSWER : : induction type single phase energy meters
13.Which of the following are integrating instruments ?
a. Ammeters
b. Voltmeters
c. Wattmeters
d. Ampere-hour and watt-hour meters
ANSWER : : Ampere-hour and watt-hour meters
14.Which of the following is an essential part of a motor meter ?
a. An operating torque system
b. A braking device
c. Revolution registering device
d. All of the above
ANSWER : : All of the above
Electrical Basic Questions 10
15.A moving-coil permanent-magnet instrument can be used as flux-meter
a. by using a low resistance shunt
b. by using a high series resistance
c. by eliminating the control springs
d. by making control springs of large moment of inertia
ANSWER : : by eliminating the control springs
16.Induction type single phase energy meters measure electric energy in
a. kW
b. Wh
c. kWh
d. VAR
ANSWER : : kWh
17.An induction meter can handle current upto
a. 10 A
b. 30 A
c. 60 A
d. 100 A
ANSWER : : 100 A
18.A potentiometer may be used for
a. measurement of resistance
b. measurement of current
c. calibration of ammeter & calibration of voltmeter
d. all of the above
ANSWER : : all of the above
19.The household energy meter is
a. an indicating instrument
b. a recording instrument
c. an integrating instrument
d. none of the above
ANSWER : : an integrating instrument
Electrical Basic Questions 10
20.Resistances can be measured with the help of
a. wattmeters
b. voltmeters
c. ammeters
d. ohmmeters and resistance bridges
ANSWER : : ohmmeters and resistance bridges
21.A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
a. deflecting
b. controlling
c. damping
d. any of the above
ANSWER : : damping
22.is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
a. Tangent galvanometer
b. Meggar
c. Current transformer
d. None of the above
ANSWER : : Meggar
23.An ammeter is a
a. secondary instrument
b. absolute instrument
c. recording instrument
d. integrating instrument
ANSWER : : secondary instrument
24.In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
a. unity
b. 0.8 lagging
c. 0.8 leading
d. zero
ANSWER : : unity
Electrical Basic Questions 10
25.A moving iron instrument can be used for
a. D.C. only
b. A.C. only
c. both D.C. and A.C.
d. none of these
ANSWER : both D.C and A.C.
26.When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is
a. short-circuited
b. all right
c. faulty
d. all right
ANSWER :all right
27.A dynamometer wattmeter can be used for
a. both D.C. and A.C.
b. D.C. only
c. A.C. only
d. any of the above
ANSWER : : both D.C. and A.C.
28.An ohmmeter is a
a. moving iron instrument
b. moving coil instrument
c. dynamometer instrument
d. none of the above
ANSWER : : moving coil instrument
Electrical Basic Questions 10
29.In a low power factor wattmeter the pressure coil is connected
a. to the supply side of the current coil
b. to the load side of the current coil
c. in any of the two meters at connection
d. none of the above
ANSWER : : to the load side of the current coil
30.Murray loop test can be used for location of
a. ground fault on a cable
b. short circuit fault on a cable
c. both the ground fault and the short-circuit fault
d. none of the above
ANSWER : : both the ground fault and the short-circuit fault
31.An induction wattmeter can be used for
a. both D.C. and A.C.
b. D.C. only
c. A.C. only
d. any of the above
ANSWER : : A.C. only
32.It is required to measure the true open circuit e.m.f. of a battery. The best device is
a. D.C. voltmeter
b. Ammeter and a known resistance
c. D.C. potentiometer
d. None of the above
ANSWER : : D.C. potentiometer
Electrical Basic Questions 10
33.The operating voltage of a meggar is about
a. 6 V
b. 12 V
c. 40 V
d. 100 V
ANSWER : : 100 V
34.The electrical power to a mega is provided by
a. battery
b. permanent magnet D.C. generator
c. AC. generator
d. any of the above
ANSWER : : permanent magnet D.C. generator
35.A voltage of about 200 V can be measured
a. directly by a D.C. potentiometer
b. a D.C. potentiometer in conjunction with a volt ratio box
c. a D.C. potentiometer in conjunction with a known resistance
d. none of the above
ANSWER : : a D.C. potentiometer in conjunction with a volt ratio box
36.The function of shunt in an ammeter is to
a. by pass the current
b. increase the sensitivity of the ammeter
c. increase the resistance of ammeter
d. none of the above
ANSWER : : by pass the current
37.The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
a. almost zero
b.low
c. high
d. none of the above
ANSWER : : high
Electrical Basic Questions 10
38.The multiplier and the meter coil in a voltmeter are in
a. series
b. parallel
c. series-parallel
d. none of the above
ANSWER : : series
39.In a meggar controlling torque is provided by
a. spring
b. gravity
c. coil
d. eddy current
ANSWER : : coil
40.The pressure coil of a wattmeter should be connected on the supply side of the current coil when
a. load impedance is high
b. load impedance is low
c. supply voltage is low
d. none of the above
ANSWER : : load impedance is high
41.In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be
a. unity
b. 0.5
c. 0.3
d. zero
ANSWER : : 0.5
42.In a low power factor wattmeter the compensating coil is connected
a. in series with current coil
b. in parallel with current coil
c. in series with pressure coil
d . in parallel with pressure coil
ANSWER : : in series with pressure coil
Electrical Basic Questions 10
43.For measuring current at high frequency we should use
a. moving iron instrument
b. electrostatic instrument
c. thermocouple instrument
d. none of the above
ANSWER : : thermocouple instrument
44.Which of the following devices should be used for accurate measurement of low D.C. voltage ?
a. Small range moving coil voltmeter
b. D.C. potentiometer
c. Small range thermocouple voltmeter
d. None of the above
ANSWER : : D.C. potentiometer
45.The adjustment of position of shading bands, in an energy meter is done to provide
a. friction compensation
b. creep compensation
c. braking torque
d. none of the above
ANSWER : : friction compensation
Electrical Basic Questions 10
