1. Form factor is the ratio of
A. rms value/average value
B. average value/rms value
C. peak value/average value
D. rms value/peak value
Ans: A
2. The domestic supply voltage 220 volt represents
A. peak value
B. average value
C. rms value
D. form factor
Ans: C
3. Which one of the following is not the unit of electrical power
A.volt/ampere
B. joule/second
C. watt
D .volt ampere
Ans: A
4. The power factor of AC circuit lies between
A. 0 and 1 B. -1 and 1 C. 0 and -1 D. None of the above
Ans: A
5. What is the SI unit of frequency ?
A.Joule B.Hertz C.Watt D. Ampere
Ans: B
6. Unit of reactive power is
A. VA B. watt C. VAR D. ohm
Ans: C
7. When a fourth resistor is connected in series with three resistors, the total resistance
A. increases by one-fourth
B. increases
C. decreases
D. remains the same
Ans: B
8. Current flows in a circuit when
A. a switch is opened
B. a switch is closed
C. the switch is either open or closed
D. there is no voltage
Ans: B
9. The minimum resistance value for a blue, gray, red, silver resistor is
A. 612
B. 6,120
C. 6,800
D. 6,460
Ans:
10. The unit for reluctance is
A. tesla
B. At/Wb
C. At/m
D. Wb
Ans: B
11.The curve representing ohms law is
A. Sine function
B. Linear
C. Parabola
D. Hyperbola
a. often zero
b.between 0 and 1
c.always unity
d. between 0 and -1
A, series with the circuit
B. parallel with the circuit
C. either in series or parallel with circuit
D. none of these
A. 5
B. 10
C. 0.05
D. 20
A. capacitance is less and frequency of supply is less
B. capacitance is less and frequency of supply is more
C. capacitance is more and frequency of supply is less
D. capacitance is more and frequency of supply is more
A. 180
B. 90
C. 60
D. 0
A. 127.4 V
B. 141.4 V
C. 282.8 V
D. 200 V
A. current
B. voltage
C. resistance
D. current, voltage, and resistance
A. ampere turns
B. flux
C. reluctance
D. flux density
A. rms value/average value
B. average value/rms value
C. peak value/average value
D. rms value/peak value
Ans: A
2. The domestic supply voltage 220 volt represents
A. peak value
B. average value
C. rms value
D. form factor
Ans: C
3. Which one of the following is not the unit of electrical power
A.volt/ampere
B. joule/second
C. watt
D .volt ampere
Ans: A
4. The power factor of AC circuit lies between
A. 0 and 1 B. -1 and 1 C. 0 and -1 D. None of the above
Ans: A
5. What is the SI unit of frequency ?
A.Joule B.Hertz C.Watt D. Ampere
Ans: B
6. Unit of reactive power is
A. VA B. watt C. VAR D. ohm
Ans: C
7. When a fourth resistor is connected in series with three resistors, the total resistance
A. increases by one-fourth
B. increases
C. decreases
D. remains the same
Ans: B
8. Current flows in a circuit when
A. a switch is opened
B. a switch is closed
C. the switch is either open or closed
D. there is no voltage
Ans: B
9. The minimum resistance value for a blue, gray, red, silver resistor is
A. 612
B. 6,120
C. 6,800
D. 6,460
Ans:
10. The unit for reluctance is
A. tesla
B. At/Wb
C. At/m
D. Wb
Ans: B
11.The curve representing ohms law is
A. Sine function
B. Linear
C. Parabola
D. Hyperbola
Ans: B
12. An electron has a ............. charge
A. negative
B. positive
C. neutral
Ans: A
13. The property of electric circuit which opposes current is
A. resistivity
B. resistance
C.conductance
D.conductivity
Ans: B
14. kirchoff's current law is applicable to only
A. junction in a network
B. closed loops in a network
C. electric circuits
D. electronic circuits
Ans: A
15. kirchoff's voltage law is related to
A. junction voltages
B. IR drops
C. battery emfs
D. both a and c
Ans: D
16. Kirchoff's current law states that
A. net current flow at the junction is positive
B. algebraic sum of currents meeting at the junction is zero
C. no current can leave the junction without some current entering it
D. current entering is not equal to leaving the junction
Ans: B
17.An atom is composed of
A. electrons
B. atoms
C. electrons and ions
Ans: A
18. The resistivity of insulators.............. rapidly withthe rise of temperature
A. increases
B. decreases
C. first increases then decreases
Ans: B
19. The unit of conductivity is
A. Ω
B. Ʊ
C. Ʊ/m
Ans: C
20. The frequency of DC supply is
A. 50 hz
B. 60 hz
C. 40 hz
D. 0 hz
Ans: D
21. A sine wave has a frequency of 50 hz.Its angular frequency is ............ radian/sec
A. 100 π
B. 50 π
C. 25 π
D. 5 π
Ans: A
22. The heater is rated as 230 V, 10 KW, AC.The value 230 V refers to
A. average value
B. peak value
C. rms value
D. none of the above
Ans: C
23. The peak value of a sine wave is 200 V.Its average value is
A. 127.4 V
B. 141.4 V
C. 282.8 V
D. 200 V
Ans: A
24. Two waves of same frequency have opposite phase when the phase between them is
A. 900
Ans: B
25. power factor of an electrical circuit is
A. R/Z
B. cosine angle between voltage and current
C. KW/KVA
D. All the above
Ans: D
26. Two waves of the same frequency have opposite phase when the phase angle between them is
a. 360
b. 180
c. 90
d. 0
Ans: b
26. A heater is rated as 230v , 10 kw, AC. the value 230v refers to
a. average value
b. rms value
c. peak voltage
d. none of these
12. An electron has a ............. charge
A. negative
B. positive
C. neutral
Ans: A
13. The property of electric circuit which opposes current is
A. resistivity
B. resistance
C.conductance
D.conductivity
Ans: B
14. kirchoff's current law is applicable to only
A. junction in a network
B. closed loops in a network
C. electric circuits
D. electronic circuits
Ans: A
15. kirchoff's voltage law is related to
A. junction voltages
B. IR drops
C. battery emfs
D. both a and c
Ans: D
16. Kirchoff's current law states that
A. net current flow at the junction is positive
B. algebraic sum of currents meeting at the junction is zero
C. no current can leave the junction without some current entering it
D. current entering is not equal to leaving the junction
Ans: B
17.An atom is composed of
A. electrons
B. atoms
C. electrons and ions
Ans: A
18. The resistivity of insulators.............. rapidly withthe rise of temperature
A. increases
B. decreases
C. first increases then decreases
Ans: B
19. The unit of conductivity is
A. Ω
B. Ʊ
C. Ʊ/m
Ans: C
20. The frequency of DC supply is
A. 50 hz
B. 60 hz
C. 40 hz
D. 0 hz
Ans: D
21. A sine wave has a frequency of 50 hz.Its angular frequency is ............ radian/sec
A. 100 π
B. 50 π
C. 25 π
D. 5 π
Ans: A
22. The heater is rated as 230 V, 10 KW, AC.The value 230 V refers to
A. average value
B. peak value
C. rms value
D. none of the above
Ans: C
23. The peak value of a sine wave is 200 V.Its average value is
A. 127.4 V
B. 141.4 V
C. 282.8 V
D. 200 V
Ans: A
24. Two waves of same frequency have opposite phase when the phase between them is
A. 900
Ans: B
25. power factor of an electrical circuit is
A. R/Z
B. cosine angle between voltage and current
C. KW/KVA
D. All the above
Ans: D
26. Two waves of the same frequency have opposite phase when the phase angle between them is
a. 360
b. 180
c. 90
d. 0
Ans: b
26. A heater is rated as 230v , 10 kw, AC. the value 230v refers to
a. average value
b. rms value
c. peak voltage
d. none of these
Ans: b
27. The power factor of RC circuit is between
a. often zero
b.between 0 and 1
c.always unity
d. between 0 and -1
Ans: b
a. 180
b. 90
c. 360
d. 270
28. The symbol j represents counterclockwise rotation of a vector through ....... degrees.
a. 180
b. 90
c. 360
d. 270
Ans: b
a. insulation separated by a dielectric
b. conductors separated by an insulator
c. ceramic plates and one mica disc
d. silver-coated insulators
a. positive
b. zero
c. negative
d. determined by battery emfs
29. A capacitor consists of two
a. insulation separated by a dielectric
b. conductors separated by an insulator
c. ceramic plates and one mica disc
d. silver-coated insulators
Ans: b
30. According to KVL the algebraic sum of all IR drops and emf's in any closed loop of a network is always
a. positive
b. zero
c. negative
d. determined by battery emfs
Ans: b
A. R/Z
B. cosine angle between voltage and current
C. KW/KVA
D. All the above
31. power factor of an electrical circuit is
A. R/Z
B. cosine angle between voltage and current
C. KW/KVA
D. All the above
Ans: D
32. Materials exhibiting zero value of resitivity are known as
A. conductors
B.semiconductors
C. insulators
D. super conductors
A. conductors
B.semiconductors
C. insulators
D. super conductors
Ans: D
33. A fuse is connected in
A, series with the circuit
B. parallel with the circuit
C. either in series or parallel with circuit
D. none of these
Ans: A
34. The capacity of a cell is measured in
A. watt-hours
B. watts
C. amperes
D. ampere-hours
A. watt-hours
B. watts
C. amperes
D. ampere-hours
Ans : D
35. A capacitor that stores a charge of 0.5 C at 10 volts has a capacitance of ....... farad.
A. 5
B. 10
C. 0.05
D. 20
Ans: C
36. Capacitive reactance is more when
A. capacitance is less and frequency of supply is less
B. capacitance is less and frequency of supply is more
C. capacitance is more and frequency of supply is less
D. capacitance is more and frequency of supply is more
Ans: A
37. The power consumed in a circuit element will be least when the phase difference between the current and voltage is
A. 180
B. 90
C. 60
D. 0
Ans: B
38. The peak value of a sine wave is 200 V. Its average value is
A. 127.4 V
B. 141.4 V
C. 282.8 V
D. 200 V
Ans : A
39. The minimum resistance value for a blue, gray, red, silver resistor is
A. 612
B. 6,120
C. 6,800 D. 6,460
Ans: B
40. The power factor of ordinary bulb is---
A. zero
B. unity
C. lagging
D. leading
39. The minimum resistance value for a blue, gray, red, silver resistor is
A. 612
B. 6,120
C. 6,800 D. 6,460
Ans: B
40. The power factor of ordinary bulb is---
A. zero
B. unity
C. lagging
D. leading
Ans: B
41. In a series resonant circuit, the impedance is
A. zero
B. maximum
C. minimum
D. none of the above
41. In a series resonant circuit, the impedance is
A. zero
B. maximum
C. minimum
D. none of the above
Ans: C
42. A multimeter measures
A. current
B. voltage
C. resistance
D. current, voltage, and resistance
Ans: D
43. Current in an electric circuit is analogous to .......... in a magnetic circuit.
A. ampere turns
B. flux
C. reluctance
D. flux density
Ans: B
44. For a frequency of 200 HZ, the time period will be
A. 0.05s
B. 0.005s
C. 0.0005s
D. 0.5s
44. For a frequency of 200 HZ, the time period will be
A. 0.05s
B. 0.005s
C. 0.0005s
D. 0.5s
Ans: B
45.The working principle of transformer depends on
A.Coulomb's law.
B.Faraday's law of electromagnetic induction.
C.Ampere's law.
D.Newton's law.
45.The working principle of transformer depends on
A.Coulomb's law.
B.Faraday's law of electromagnetic induction.
C.Ampere's law.
D.Newton's law.
Ans:B
46. Ω (Ohm) is the Unit of ___________?
A. Resistance (R)
B. Inductive Reactance ( XL)
C. Capacitive Reactance (Xc)
D. All of the above
46. Ω (Ohm) is the Unit of ___________?
A. Resistance (R)
B. Inductive Reactance ( XL)
C. Capacitive Reactance (Xc)
D. All of the above
Ans:D
0 comments:
Post a Comment