2019 SSC Junior Engineer Electrical Online Exam 2019 CPWD/CWC/MES Electrical Engineering Set 1.5

41. The cheap and temporary system of internal wiring is ?

A) CTS or TRS wiring
B) Conduit wiring
C) Casing-capping
D) Cleat wiring

... Answer is D)
Cleat wiring is the cheapest method of wiring. The wires remain exposed to view, and these wires are drawn through cleats made of porcelain or plastic or some other approved material. The wires used are either V.I.R. or single-core P.V.C. wires.

The types of internal wiring used in domestic installations are Cleat wiring.
Advantage of Cleat wiring are:
Cheap and easy wiring
# Easy to fault detection
# Easy to repair
# Alteration and addition is easy. .

42. For a three layer stranded wire, the number of strands in first, second and third layer respectively are ?

A) 1,7 and 14
B) 1,6 and 12
C) 1,5 and 10
D) 1, 4 and 8

... Answer is #)

43. The output of logic circuit given below represents __ gate ?

A) NOR
B) NAND
C) OR
D) AND

... Answer is B)

44. Which of the following voltage range is used in medium transmission lines ?

A) 50 kV to 200 kV
B) 20 kV to 100 kV
C) More than 200 kV
D) Less than 20 kV

... Answer is B)
Transmission lines having length more than 80 Km and less than 200 Km, operating voltage between 20 KV and 100 KV fall in the category of medium transmission lines.

45. _is the measuring unit of inductive susceptance ?

A) Mho
B) Tesla
C) Henry
D) Weber

... Answer is A)
As conductance is the complement of resistance, there is also a complementary expression of reactance, called susceptance. Mathematically, it is equal to 1/X, the reciprocal of reactance. Like conductance, it used to be measured in the unit of mhos but now is measured in Siemens..

46. Find the mutual inductance between two ideally coupled coils of 2 H and 8H ?

A) 2 H
B) 4 H
C) 8 H
D) 10 H

... Answer is B)

47. Which of the following should be used under no-load conditions ?

A) Circuit breaker
B) leakage coefficient
C) Isolator
D) Rewireable fuse

... Answer is C)
Isolator switches are used for opening and closing an electrical circuit in the no-load condition.

48. If N F = linkage flux, then the linkage flux per unit current is defined as ?

A) inductive reactance
B) leakage coefficient
C) inductance
D) magneto motive force

... Answer is C)
If the current through a coil is altered then the flux through that coil also ...
(a) Nf = LI or (b) Using the equation for the e.m.f. generated:

E = - L(dI/dt)

So: The unit of inductance is the henry and it is defined as the inductance of a coil (or circuit) ... now change by an amount dI in a time dt, giving a change of flux linkage d(Nφ)/dt.

Linkage flux per unit current is called inductance .

49. If an AC circuit is supplied with an active power of 500 W and reactive power 500 VAR, then the load power factor of the circuit is ?

A) 0
B) 0.5
C) 1/√2
D) 1

... Answer is C)
Apparent Power

The product of root mean square (RMS) value of voltage and current is known as Apparent Power. This power is measured in kVA or MVA.

Active Power

The power which is actually consumed or utilised in an AC Circuit is called True power or Active power or Real power. It is measured in kilowatt (kW) or MW. It is the actual outcomes of the electrical system which runs the electric circuits or load.

Reactive Power

The power which flows back and forth that means it moves in both the directions in the circuit or reacts upon itself, is called Reactive Power. The reactive power is measured in kilo volt-ampere reactive (kVAR) or MVAR.

50. Ratio of average energy demand to maximum demand during a specific period is ?

A) Load factor
B) Power factor
C) Utilization factor
D) Form factor

... Answer is A)
Load factor is defined as the ratio of the average load over a given period to the maximum demand (peak load) occurring in that period.
In other words, the load factor is the ratio of energy consumed in a given period of the times of hours to the peak load which has occurred during that particular period.

1 2 3 4 5 6 7 8 9 10