2019 SSC Junior Engineer Electrical Online Exam 2019 CPWD/CWC/MES Electrical Engineering Set 1.4

31. Based on the voltmeter and ammeter readings in the measuring network determine the value of the resistor R ?

A) 1 ohm
B) 5 ohm
C) 10 ohm
D) 2 ohm

... Answer is C)
1/2 Current flow in circuit. this current also flow in R ohm resistance

Due to 1/2 A current 5V drop accros R resistance
So, IR = 5V

1/2 * R = 5
R = 10 Ohm

.

32. Direction of the arrow represents the direction of__when the diode is forward biased ?

A) P-type material
B) P-N Junction
C) N- Type material
D) Conventional current flow

... Answer is D)
Forward bias allows current to flow through the diode. ... Think of the anode side of the symbol as an arrow that indicates the direction of conventional current flow — from positive to negative. Thus, the diode allows current to flow in the direction of the arrow..

33. Which of the following fuel has least calorific value ?

A) LPG
B) Hydrogen
C) Wood
D) Kerosene oil

... Answer is C)
46.1 MJ/kg
LPG has a typical specific calorific value of 46.1 MJ/kg compared with 42.5 MJ/kg for fuel oil and 43.5 MJ/kg for premium grade petrol (gasoline).

Hydrogen gas has the highest calorific value i.e., 150 kJ/kg, yet it is not used as a fuel.

Heat of combustion of kerosene is similar to that of diesel fuel; its lower heating value is 43.1 MJ/kg (around 18,500 Btu/lb), and its higher heating value is 46.2 MJ/kg (19,900 Btu/lb).

The net calorific value of wood is a quantity that can vary even for the same type of wood, with typical ranges varying from 16 to 21 MJ/kg

34. In transmission line, the voltage regulation is negative whenever receiving end voltage VR ?

A) Less than the sending end voltage
B) Greater than the sending end voltage
C) half of the sending end voltage
D) Equal to the sending end voltage

... Answer is B)

35. Two induction of 4H and 6H are connected in series. The equivalent inductance of this combination is ?

A) 2.4 H
B) 4 H
C) 6 H
D) 10 H

... Answer is D)
(neglecting mutual induction between coils)
The equivalent inductance of two inductors 4H and 6H in series combination is.
4H+6H = 10H

36. The below symbol which is used in single line diagrams represents ?

A) circuit breaker
B) potential transformer
C) current transformer
D) power transformer

... Answer is B)
The potential transformer may be defined as an instrument transformer used for the transformation of voltage from a higher value to the lower value.

37. Two coupled coils with L1 = L2 = 0.5 H have a coupling coefficient of K=0.75. The turn ratio N1/N2 = ?

A) 0.5
B) 1
C) 2
D) 4

... Answer is B)
Given L1 = L2 = 0.5H, K =0.75

38. _is used to manufacture stay wire, earth wire, and structural components ?

A) Hard drawn copper
B) Galvanised steel
C) Cadmium copper
D) Nichrome

... Answer is B)
Stay Wire And Earth Wires Stay Wires are galvanized steel wire strands that are used for sustaining mechanical load. Stay Wire and earth wires are made from stranded galvanised high carbon steel wires.

39. An electric heater is connected across 230V and it draws a current of 2A. Then the resistance offered by the heater is ?

A) 11.5 ohm
B) 23 ohm
C) 115 ohm
D) 230 ohm

... Answer is C)
Given V = 230V, I = 2A, R = ??

V = IR

R = V/I

R =230/2

R= 115 Ohm

.

40. The amount of AC content present in the DC output of a rectifier is given by ?

A) peak factor
B) ripple factor
C) form factor
D) power factor

... Answer is B)
Ripple is the fluctuating AC component present in rectified DC output. The output of a rectifier may either be DC current or voltage.
In view of this, AC fluctuating component present in DC output voltage is called voltage ripple and that in DC current output is called current ripple.

Ripple is an unwanted ac component in dc output. Smaller value of ripple factor is desirable. Ideal value of ripple factor is zero









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