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NIST / HITECH ITI - ELECTRICIAN TRADE THEORY - MOCK TEST - MARKS 150 - TIME 2 HRS

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1. The unit of the quantity of electricity is ………………..

A) Ampere/ second

B) coulomb

C) ohm

D) watt-second

E) Unknown

2.What is the formula to be used to find the power, if the current & voltage value are known ?

A) V×I

B) V²/I

C) V²×I

D) v×I

E) Unknown

3. Which material is commonly used as conductor?

A) GLASS

B) COPPER

C) EBONITE

D) RUBBER

E) Unknown

4. Ohm’s law does not apply to

A) conductors

B) dc circuits

C) ac circuits

D) semi- conductors

E) Unknown

5. power is defined as …………..

A) the rate doing work

B) the rate of change of time

C) the rate of change of motion

D) the rate of change of state

E) Unknown

6. 1 HP= ………………. Watt

A) 0.7355

B) 7.355

C) 735.5

D) 7355.0

E) Unknown

7. The unit of flux density is ………..

A) ampere-turns

B) Weber

C) web/m²

D) ampere turns/web

E) Unknown

8. what is the unit of permeability ?

A) ampere –turns

B) Weber/m²

C) no- unit

D) tesla

E) Unknown

9. which rule is to be applied to find the direction of magnetic flux ?

A) Fleming right hand rule

B) end rule

C) Fleming left hand rule

D) corks screw rule

E) Unknown

10. which magnetic term is the analogous ( similar) to the electrical of current

A) flux density

B) permeance

C) flux

D) reluctance

E) Unknown

11. Flemings right hand rule is to identify the

A) direction of flux

B) direction of rotation of a generator

C) direction of current in a motor

D) direction of induced e.m.f

E) Unknown

12. temporary magnets are made of …..

A) steel

B) soft iron core

C) aluminum

D) copper

E) Unknown

13. what is the permeability of diamagnetic material ?

A) less than unity

B) unity

C) greater than unity

D) none of these

E) Unknown

14. tesla is the s.i unit of …………..

a) flux density

b) magneto motive force

c) reluctance

d) magnetic field strength

E) Unknown

15. the tubes of force within the magnetic material is known as …………….

a) electric flux

b) lines of force

c) tubes of induction

d)none of above

E) Unknown

16. the relative permeability of a Ferro magnetic material is ………

a) less than one

b) more than 10

c)more than one

d) more than 100or 1000

E) Unknown

17. the relative permeability of vacuums…

a) 1

b) 1 H/M

C) 1/4¶

d) 4¶ ×10¯7

E) Unknown

18. Conductivity is analogous to.

a) Retentivity

b) resistivity

c) permeability

d)inductance

E) Unknown

19. the most commonly used all is

a) Lead acid cell

b) nickel iron cell

c) nickel cadmium cell

d) fuel

E) Unknown

20. The capacity of a lead acid cell does not depend on its.

a) Rate of charge

b)rate of discharge

c)temperature

d)none of these

E) Unknown

21. The capacity of a storage cell is measured in.

a)joules

b)watt-hour

c)ampere hour

d)could

E) Unknown

22. When a cell is charging

a) chemical energy is converted to electrical energy

b) electrical energy is converted to chemical energy

c)chemical energy is converted to potential energy

D)None of the above

E) Unknown

23. The formation of the hydrogen bobbies around the carbon electrode in a dry Cell is.

a)local action caused by chemical impurities

b)polarization caused by electrolysis

c)depolarization caused by magnets dioxide

d)none of the above

E) Unknown

24. The e.m.f of a storage battery depends upon.

a)size of the electrodes

b)shape of a cell

c)nature of the electrodes

d)all of the above

E) Unknown

25. The ampere hour capacity of a battery depends on.

a)thickness between plates

b)distance between plates

c)strength of the electrolyte

d)area of the plates

E) Unknown

26. 4 cells of 1.5v each are connected in the o/p voltage is.

a)1.5v

b)3v

c)6v

d)8v

E) Unknown

27. The common impurity in the electrolyte of lead-acid batter is.

a)chlorine

b)dust particles

c)lead crystals

d)iron

E) Unknown

28. Brushes are used.

a)to collect current from the commentator

b)to faci;itate collection of current from the armature conductors

c)to hold the abon

d)none of the above

E) Unknown

29. The e.m.f equation of the DC generator which is haring simplex wave wound armature is.

a)E= ØZN/60 volt

B)E=ØZN*P/120 volt

c)E=Øzp/60*A volt

d)E=ØZN/120volt

E) Unknown

30. High voltage DC machine use ------------------ winding

a) Lap

b)wave

c)Either lap or wave

d) none of the above

E) Unknown

31. The commutator of a dc generator act as

a) an amplifier

b)a rectifier

c)a load

d)none of these

E) Unknown

32. The input side of the single phase transformer is called as.

a)secondary side

b) primary side

c) high voltage side

d) low voltage side

E) Unknown

33. What is the formula for the transformation ratio (k) of the single phase transformer

a) K=e2/e1=n1/n2=i1/i2

b)k=e2/e1=n2/n1=i2/i1

b) K=e2/e1=n2/n1=i1/i2

d)k=e1/e2=n1/n2=i1/i2

E) Unknown

34. The colour of the fresh silicon gel used in breather of the transformer is.

a) blue

b)white

c)green

d) violet

E) Unknown

35. In a transformer, the energy is transferred from primary to secondary

a)through cooling coil

b)through air

c)by the flux

d)none of the above

E) Unknown

36. The transformer ratings are usually expressed in terms of

a)volts

b)amperes

c)Kw

d)KVA

E) Unknown

37. which winding in a transformer has more number of turns

a)low voltage winding

b)high voltage winding

c)primary winding

d)secondary winding

E) Unknown

38. The unit of capacitance is

a)Henry

b)farad’s

c)Weber

d)ohm

E) Unknown

39. Active power is measured in

a)KVA

b)KVAR

c)amplitude

d)time period

E) Unknown

40. The ratio of resistance and impedance is called

a) power factor

b)form factor

c) amplitude

d)time period

E) Unknown

41. What is SI units of resistance

A)ohms

b)farad

c)Henry

d)seimens

E) Unknown

42. Reciprocal of resistance is called

a)specific resistance

b)conductivity

c) conductance

d)suseptance

E) Unknown

43. Rheostat is which type of resistor

a)variable

b)fixed

c)a,b

d)none of the above

E) Unknown

44. Resistance is used to

a)voltage controlled

b)current controlled

c)power controlled

d)all the above

E) Unknown

45. In a closed circuit 2 resistance are connected to parallel combination

a)R1+R2

b)1/R1+R2

c)R1+R2/R1+R2

d)R1+R2/R1+R2

E) Unknown

46. Ohm’s law is v=RI is applicable to

a)linear device

b)non-linear device

c)both linear and non linear device

d) none of these above

E) Unknown

47. Given four 1 Ώ resistors , state how they must be connected to given an overall resistance of

a)1/4Ώ

B)1Ώ

c)1 1/3Ώ

d)2 1/2Ώ

E) Unknown

48. Which method is used to for the measurement of low resistance

a)Kelvin bridge method

b)Wheatstone bridge method

c)substitution method

d)mega ohm bridge method

E) Unknown

49. The reciprocal of the frequency is known as

a)time period

b)form factor

c)amplitude

d)time period

E) Unknown

50. The mean value of alternating current for one Complete cycle is

a)zero

b)one

c)two

d)three

E) Unknown