# Technical Test SSC JE: Electrical Engineering (EE)- 11

## 100 Questions MCQ Test Mock Test Series for SSC JE Electrical Engineering | Technical Test SSC JE: Electrical Engineering (EE)- 11

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Attempt Technical Test SSC JE: Electrical Engineering (EE)- 11 | 100 questions in 100 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Mock Test Series for SSC JE Electrical Engineering for Electrical Engineering (EE) Exam | Download free PDF with solutions
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Three resistance of values 8 ohms, 12 ohms  and 24 ohms are connected in parallel across12 volts supply, the total resistance of the circuit will be

Solution:
QUESTION: 4

The sure test of electrification is

Solution:
QUESTION: 5

The suspectance (b) of a branch can be determined by

Solution:
QUESTION: 6

106.The accuracy of M.C. instrument as compared to M.I. instruments is –

Solution:
QUESTION: 7

Which of the following advantage, the dynamometer watt meter has ?

Solution:
QUESTION: 8

In case of two phase supply the electrical displacement of the winding is –

Solution:
QUESTION: 9

Synchronising (parallel operation) of three phase alternator as compared to single phase alternator is –

Solution:
QUESTION: 10

The controlling torque can be produced by –

Solution:
QUESTION: 11

The generator which gives d.c. supply to the rotor is called –

Solution:
QUESTION: 12

Under no load running condition the angle between induced voltage and supply voltage willbe –

Solution:
QUESTION: 13

One foot angular is equal to –

Solution:
QUESTION: 14

For welding of sheets which type of welding is recommended –

Solution:
QUESTION: 15

The spot welding machine can be used for welding sheets of thickness –

Solution:
QUESTION: 16

In which of the following places 70 MW gas turbine power plant being operated as base load plant ?

Solution:
QUESTION: 17

The solar or photo voltaic cell converts

Solution:
QUESTION: 18

The efficiency of solar cell is about

Solution:
QUESTION: 19

The main source (s) of production of biogas is / are

Solution:

Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen (anaerobically), primarily consisting of methane and carbon dioxide. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste.

QUESTION: 20

Which of the following plants will take least time in starting from cold conditions to full-load operation ?

Solution:
QUESTION: 21

Shunt capacitors in a substation

Solution:
QUESTION: 22

The unit of transmission loss coefficient is

Solution:
QUESTION: 23

The permissible variation of frequency in power system is

Solution:
QUESTION: 24

Generators for base load plants are usually designed for maximum efficiency around

Solution:
QUESTION: 25

Two -insulator discs of identical capacitance value C makes up a string for a 22 kV, 50 Hz,single-phase overhead line insulation system. If the pin to earth capacitance is also C, then the string efficiency is

Solution:
QUESTION: 26

The knowledge of diversity factor helps in computing

Solution:
QUESTION: 27

The load duration curve for a power station is as shown in the given figure. The reserve capacity in the plant at 70% capacity factor is Solution:
QUESTION: 28

Flat rate tariff can be charged on the basis of
)

Solution:
QUESTION: 29

The low power factor of an industrial plant is uneconomical for

Solution:
QUESTION: 30

Consider the following materials for line conductors :
1. Hard drawn copper
3. Aluminium
4. Galvanised steel
The correct sequence of the descending order of their electrical conductivities is

Solution:
QUESTION: 31

Effect of temperature rise in overhead lines is to

Solution:
QUESTION: 32

Stringing chart is useful

Solution:
QUESTION: 33

The number of discs in a string of insulators for 400 kV ac overhead transmission line lies in therange of

Solution:
QUESTION: 34

Transmission lines are transposed to

Solution:
QUESTION: 35

For transmission line which one of the following relation is true ?

Solution:
QUESTION: 36

Sheaths are used in cables to

Solution:
QUESTION: 37

As compared to ac transmission dc transmission is free from

Solution:
QUESTION: 38

Plug setting of an electromagnetic relay can be altered by varying

Solution:
QUESTION: 39

The operating characteristic of a distance relay in the R-X plane is shown in the figure. It represents operating characteristic of a Solution:
QUESTION: 40

Undervoltage relays are mainly used for

Solution:
QUESTION: 41

Signal mixing transformers are used for

Solution:
QUESTION: 42

The current ICBO flows in the

Solution:
QUESTION: 43

In a common collector amplifier the voltage gain is

Solution:
QUESTION: 44

When a transistor is used in switching mode then what is the turn on time ?

Solution:
QUESTION: 45

In the pnp transistor circuit shown in the given figure, the transistor is in saturation with values of Vbe = 0.7 V,V ce(sat) = 0.3 V and b min = 20.The value of IC will be Solution:
QUESTION: 46

A silicon transistor with VBE sat = 0.8V,b dc = 100and VCE sat= 0.2 V is used in the circuit shown in given figure.What is the minimum value of RC for which transistor is in saturation ? Solution:
QUESTION: 47

For a trans conductance amplifier, input and output resistances are respectively

Solution:
QUESTION: 48

The FET shown is a Solution:
QUESTION: 49

Thermal runaway is not encountered in FETs because

Solution:
QUESTION: 50

The applied voltage of a certain transformer is increased by 75%; while the frequency of theapplied voltage is reduced by 25%. The maximum core flux density will :

Solution:
QUESTION: 51

On which of the following factors does hysteresis loss depend ?
(1) Flux density
(2) Frequency
(3) Thickness of laminations
(4) Time
Select the correct answer using the code given below:

Solution:
QUESTION: 52

The total iron loss in a transformer core at normal flux density was measured at 25 Hz and at 50Hz and was found to be 250 W and 800 W respectively. The hysteresis loss at Hz would be

Solution:

according to the data flux density is constant.
Pe1=f12 Ph1=f1
Pe2=f22 Ph2=f2

taking f1=25hz
f2=50 hz
Pe1/Pe2=1/4
Ph1/Ph2=1/2

now iron loss Pi=Ph1+Pe1
Therefoe
1. ph1 + pe1=250
2. 2ph1+ 4pe1=800
solving we get ph2= 200w

QUESTION: 53

Open-circuit test in a transformer is performed with

Solution:
QUESTION: 54

The full-load copper loss and iron loss of a transformer are 6,400 W and 500 W,respectively. The above copper loss and iron loss at half load will be :

Solution:
QUESTION: 55

If P1 and P2 be the iron and copper losses of transformer at full-load and the maximum efficiency is at 75% of the full-load, then what is the ratio of P1 and P2?

Solution:
QUESTION: 56

A 500 kVA transformer has constant loss of 500 W and copper losses at full load are 2,000 W.Then at what load, is the efficiency maximum ?

Solution:
QUESTION: 57

The concentric windings are used in core type transformers with ______ winding placed next to the core.

Solution:
QUESTION: 58

Scott-connected transformers can convert
(a) 3 to 2 phases (b) 2 to 3 phase
(c) 2 to 4 phases (d) 3 to 4 phase
From the above correct answer is

Solution:
QUESTION: 59

For the parallel operation of transformers, which of the following conditions must be satisfied ?

Solution:
QUESTION: 60

Two transformers operating in parallel will share the load depending upon their

Solution:
QUESTION: 61

The saving in copper achieved by converting ordinary two winding transformer into an auto transformeris governed by the

Solution:
QUESTION: 62

Assertion (A): Norton's theorem is applied to a network for which no equivalent Thevenin's
network exists.

Reason (R): Norton's Theorem enables one to calculate quickly current and voltage in a
particular branch of interest in a complicated network.

Solution:
QUESTION: 63

Superposition theorem is not applicable for

Solution:
QUESTION: 64

Consider the circuits A and B given below: For what values respectively of l and R, the circuit B is equivalent to circuit A ? Solution:
QUESTION: 65

The output resistance of the circuit at port AB is Solution:
QUESTION: 66

The current is given by If the steady -state current at t = ¥ is 12A, then the value of a and initial value of current will be

Solution:
QUESTION: 67

A cable has inductance of 0.22 mH per km and capacitance of 0.202mF per km. The surge impedance of the cable is

Solution:
QUESTION: 68

A high resistance cannot be measured by simple ammeter-voltmeter principle because

Solution:
QUESTION: 69

Consider the following statements regarding the balanced ac bridge shown in the given figure for
measurement of a coil Z1 1. Z2 = Z2 in series with LZ3 = R3, Z4 = R4
2. Z2 = R2, Z3 = R3 and Z4 = R4 in parallel with L4
3. Z2 = R2, Z3 and Z4 = R4, in series with L4
4. Z2 = R in parallel with L2, = Z3 = R3 and Z4 = L4
Which of these statements are correct ?

Solution:
QUESTION: 70

In an Anderson bridge, the unknown inductance is measured in term of known

Solution:
QUESTION: 71

Which one of the following is represented by the circuit shown below Solution:
QUESTION: 72

Which of the following bridges can be used for inductance measurement ?
1. Maxwell bridge
2. Hay's bridge
3. Wein bridge
4. Wheatstone bridge
Select the correct answer using the code given below

Solution:
QUESTION: 73

An imperfect capacitor is represented by a capacitance C in parallel with a resistance R. The
value of the dissipation factor tan d is

Solution:
QUESTION: 74

For the bridge shown in the given figure. At the balance the values of Rx, Cx and Qx will be Solution:
QUESTION: 75

Which of the following is used to measure the leakage resistance of a capacitor

Solution:
QUESTION: 76

Wagner Earth devices in ac bridge circuits are used for

Solution:
QUESTION: 77

A bridge circuit works at a frequency of 2 kHz. Which detector can be used for detecting the null conditions in the bridge

Solution:
QUESTION: 78

The current drawn by a 220 V dc motor of armature resistance 0.5W and back emf 200 Vis

Solution:
QUESTION: 79

A d.c. series motor is accidentally connected to single-phase a.c. supply. The torque produced will be

Solution:
QUESTION: 80

For a given torque reducing the diverter resistance  of a d.c. series motor

Solution:
QUESTION: 81

The dummy coils in d.c. machines are useful to

Solution:
QUESTION: 82

The speed of a d.c. shunt motor may be varied by varying
1. Field current
2. Supply voltage
3. Armature circuit
Select the correct answer using the codes given below:

Solution:
QUESTION: 83

Consider the following statements In a dc machine, iron loss occurs in
1. armature core
2. yoke
3. pole cores
4. pole shoes
Which of these statements are correct

Solution:
QUESTION: 84

The armature resistance of a 6-pole lap wound d.c. machine is . If the armature is
rewound as a wave-winding, what is the armature resistance

Solution:
QUESTION: 85

Match List-I (Characteristic) with List-II n (Relation) and select the correct answer using
the code given below the lists: Solution:
QUESTION: 86

For a constant supply voltage, what are the effects of inserting a series resistance in the field circuit of a d.c. shunt motor, on its speed and torque

Solution:
QUESTION: 87

If the armature current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary

Solution:
QUESTION: 88

189.Neglecting all losses, how is the developed torque (T) of a dc separately excited motor, operating under constant terminal voltage related to its output power (P)

Solution:
QUESTION: 89

A dc shunt generator is supplying a load of 1.8 kW at 200 V. Its armature and field resistances are 0.4W and 200W respectively. What is the generated emf

Solution:
QUESTION: 90

Torque developed by the armature of a dc motor is proportional to which one of the following

Solution:
QUESTION: 91

What are slot wedges in a dc machine, made of

Solution:
QUESTION: 92

The graph shown below represents which characteristic of a d.c. shunt generator Solution:
QUESTION: 93

The armature MMF waveform of a dc machine is

Solution:
QUESTION: 94

For a P-pole machine, the relation between electrical and mechanical degrees is

Solution:
QUESTION: 95

The maximum efficiency occurs in a separately excited d.c. generator when the terminal voltageis 220 V and the induced emf is 240 V, the stray losses, if the armature resistance is 0.2 W , will be

Solution:
QUESTION: 96

Which one of the following statements is correct for the ideal field excitation during starting in caseof shunt and compound motors

Solution:
QUESTION: 97

The air-gap between the yoke and armature in a dc motor is kept small

Solution:
QUESTION: 98

A 4-pole dc generator is running at 1500 rpm. The frequency of current in the armature winding is

Solution:
QUESTION: 99

The overall efficiency of a dc shunt generator is maximum when its variable loss equals

Solution:
QUESTION: 100

When a 'pumped storage' power plant is operated in conjunction with a steam power plant

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