# Mock Test: SSC JE (ME)- 15

## 100 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Mock Test: SSC JE (ME)- 15

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Attempt Mock Test: SSC JE (ME)- 15 | 100 questions in 100 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Mechanical Engineering SSC JE (Technical) for Mechanical Engineering Exam | Download free PDF with solutions
QUESTION: 1

### For a single phase capacitor start induction motor which of the following is valid ?

Solution:  QUESTION: 2

Solution:
QUESTION: 3

### What is the value of the current I in the circuit shown below ? Solution: QUESTION: 4

In the following type of conductors the corona is minimum in

Solution:
QUESTION: 5

Consider the following w.r.t. the circuit as shown below 1. VR 100√ 2V=
2. | I |rms = 2A
3. L = 0.25H
Which of the above statements is/are correct?

Solution: QUESTION: 6

If the time delay of relay with TMS setting 0.1 is 10 second then what is the time delay whenthe TMS setting is changed to 0.5

Solution: QUESTION: 7

The machine used in wind will is

Solution:
QUESTION: 8

In an RLC series resonant circuit, if the maximum stored energy is increased by 10%and at the same time, the energy dissipated per cycle is reduced by 10%, it will result in whichone of the following ?

Solution: QUESTION: 9

Consider the following components Out of these components, which component(s)can be common for primary & back up protection

Solution:
QUESTION: 10

In a series resonance circuit, at resonance selectivity Q is equal to

Solution:
QUESTION: 11

Positive sequence terminal voltage is zero in

Solution:
QUESTION: 12

.Most economical load in the underground cable is

Solution:
QUESTION: 13

The friction experienced by a body, when in motion, is known as

Solution:
QUESTION: 14

certain network consist of a large number of ideal linear resistances, one of which is
designated consumed by R is P1 when only the first source is active, and P2 when only the
second source is active, if both source are active simultaneously, then the power consumed by R
is

Solution: QUESTION: 15

Consider the following statement about D'Arsonval Movement
1. It is best suited for d.c. current measurement
2. It responds to the average value of current
3. It could be used for power measurements Which of these statements is/are correct

Solution: QUESTION: 16

Torque/weight ratio of an instrument indicates

Solution:
QUESTION: 17

A current transformer has a phase error of +3º. The phase angle between the primary andsecondary current is

Solution: QUESTION: 18

The direction of rotation of a d.c. series motorcan be reversed

Solution: QUESTION: 19

A three phase transformer having zero sequence impedance of Zo has the zero-sequencenetwork as shown in the figure below. The connection of its windings are Solution:
QUESTION: 20

The transformer laminations are insulated from each other by

Solution:
QUESTION: 21

A coil with certain number of turns has a specified time constant. If the no. of turns isdoubled, its time constant would

Solution: QUESTION: 22

The technique of adding a precise amount of time between the trigger point and the beginningof the scope-sweep in a CRO is known as

Solution:
QUESTION: 23

In a CE (common emitter) transistor, VCC = 12V and the zero signal collector current is 1mA. Determine the operating point when collector load (RC) is 6 KW

Solution:
QUESTION: 24

A 100 H.P. motor with a synchronous speed of 720 rpm at 50 Hz has 96 stator slots with4 conductors per slot and 120 rotor slots with 2 conductors per slot. If the full load efficiencyis 0.92 and the p.f. is 0.9 lagging, the current per phase when the stator is star connected to3-phase, 500V supply will be

Solution: QUESTION: 25

Which of the following application requires high starting torque ?

Solution:
QUESTION: 26

Which DC motor will be preferred for machine tools ?

Solution:
QUESTION: 27

The empty space between the plates of a capacitor is filled with liquid of dielectricconstant K the capacitance of capacitor

Solution:  QUESTION: 28

If current through the operating coil of a moving iron instrument is doubled, the operating forcebecomes

Solution:
QUESTION: 29

A magnetic needle is kept in a uniform magnetic field. It experiences

Solution:
QUESTION: 30

Solution:
QUESTION: 31

For improvement of power factor

Solution:
QUESTION: 32

A 4-pole 500V shunt motor has 720 wave connected conductors on its armature. The fullload armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.2Wand the contact drop per brush is 1V. What is the back emf ?

Solution: QUESTION: 33

In an autotransformer of voltage ratio  the fraction of power transferred
inductively is proportional to

Solution:
QUESTION: 34

Stepped core is used in transformers in order to reduce

Solution:
QUESTION: 35

A make break switch is provided to disconnect the battery when the meter is not in use is

Solution:
QUESTION: 36

Which instrument is the cheapest, disregarding the accuracy

Solution:
QUESTION: 37

In dc machines, the armature reaction mmf is

Solution:
QUESTION: 38

Inductance affects the flow of direct current at the time of

Solution: QUESTION: 39

A centre zero ohmmeter connected in the rotor circuit of 6-pole 50 Hz induction motor makes30 oscillations in one minutes. The rotor speed is

Solution: QUESTION: 40

A coil of resistance 20W and inductance 0.8 H is connected to a 200V DC supply. The rate
of change of current at t = 0+ is

Solution: QUESTION: 41

What should be the value of resistance R, in the above circuit if it has to absorb the maximum
power from the source

Solution: QUESTION: 42

The torque on the rotor of a 3- W motor is more constant than that of a single phase motorbecause

Solution:
QUESTION: 43

When the secondary coil of a transformer is short circuited, the primary inductance

Solution: QUESTION: 44

Q-factor of a parallel tuned circuit can be increased by

Solution: QUESTION: 45

Air blast circuit breakers for 400 KV power system are designed to operate in

Solution:
QUESTION: 46

An overhead line conductor has an inductance per unit length of L Henry. If the entire medium
around the conductor is filled with a dielectric material of permittivity (E), then the inductance
will be

Solution: QUESTION: 47

In two-wattmeter method of power measurement one of the wattmeter will shownegative reading when the load pf angle is strictly

Solution:
QUESTION: 48

A reactance relay is

Solution:
QUESTION: 49

To limit current chopping in vacuum circuit breakers, the contact

Solution:
QUESTION: 50

The main difference between speed-time curves of mainline service as compared to suburbanservices in

Solution:
QUESTION: 51

Which of the following relay has directional feature

Solution:
QUESTION: 52

Carbon brushes are preferable to copper brushes because

Solution:
QUESTION: 53

A power plant has a maximum demand of 15 MW. The load factor is 50% and the plantfactor is 40%. The operating reserve is

Solution: QUESTION: 54

The starting torque of a servomotor under unbalanced operation is proportional to

Solution: QUESTION: 55

Quadrilateral speed-time curve is the closer approximation for

Solution:
QUESTION: 56

Travelling crane is used for lifting and moving heavy loads. It uses

Solution:
QUESTION: 57

For Domestic wiring method commonly used is

Solution:
QUESTION: 58

The time taken for a surge to travel a 600 km long overhead transmission link is

Solution: QUESTION: 59

Ripple factor of half wave rectifier is

Solution:
QUESTION: 60

Which one is unipolar transistor

Solution:
QUESTION: 61

A polarized electrolytic capacitor can be used

Solution:
QUESTION: 62

A moving coil instrument gives full scale deflection with a current of 100 mA when thepotential difference across its terminals is 50 mV. Calculate the shunt resistance to enablethe instrument to read upto 100 A

Solution: QUESTION: 63

Which of the following motors are used in tape recorders

Solution:
QUESTION: 64

Which motor would you select for vacuum cleaner

Solution:
QUESTION: 65

A tank circuit consist of

Solution:
QUESTION: 66

The commulator in a dc machine acts as

Solution:
QUESTION: 67

Ferranti effect on transmission line is a phenomenon which represents

Solution:
QUESTION: 68

EHV cables are filled with thin oil under pressure

Solution:
QUESTION: 69

Arcing on transmission lines is prevented by connecting a suitable

Solution:
QUESTION: 70

In half wave rectifier, if an a.c. supply is 60 Hz, then what is the a.c. ripple at output ?

Solution:
QUESTION: 71

A power supply has full load voltage of 24V. What is the no load voltage for 5% regulation?

Solution: QUESTION: 72

For an existing ac transmission line, the string efficiency is 80%. If dc voltage is supplied forthe same set up, the string efficiency will be

Solution:
QUESTION: 73

When excitation is altered in an alternator connected to an infinite line, it provides acorresponding change in

Solution:
QUESTION: 74

Lightening surges are arrested by

Solution:
QUESTION: 75

The rms value of a half wave rectified currentis 10A. Its value for full wave rectification would be

Solution:
QUESTION: 76

176. For the wave given below, the rms value will be Solution:
QUESTION: 77

177.The equation for 25 cycles current sine wave having rms value of 30 amperes will be

Solution:
QUESTION: 78

A 220 V series motor takes a current 35 amp and runs at 500 rpm. Armature resistance =0.25W and series field resistance = 0.3W. If iron and friction losses amount to 600W. Whatis the armature torque

Solution: QUESTION: 79

Illumination level required for precision work is around

Solution:
QUESTION: 80

Lumen/watt is the unit of

Solution:
QUESTION: 81

A DC generator used for ac welding should have

Solution:
QUESTION: 82

The load taken by welding transformer is

Solution:
QUESTION: 83

In rectifier circuit shown above, what should be minimum peak-inverse voltage (PIV) ratingof the diode Solution: QUESTION: 84

In an open circuited p-n junction diode space charge density at the junction is

Solution:
QUESTION: 85

In an HVDC system

Solution:
QUESTION: 86

In order to have lower cost of power generation

Solution:
QUESTION: 87

Mho relay is usually employed for the protection of

Solution:
QUESTION: 88

The making and breaking currents of 3- f ac circuit breakers in power system arerespectively in what form

Solution:
QUESTION: 89

For a fault in power system, the term critical clearing time is related to

Solution:
QUESTION: 90

A cable has inductance of 0.22 mH per km and capacitance of 0.22 mF per km. The surgei mpedance of the cable is

Solution: QUESTION: 91

The shunt winding of a motor has a resistance of 85W at 22ºC. When the motor runs at fullload, its resistance increases to 100 ohms. The resistance temperature coefficient of winding perOºC is 0.004. The rise in temperature of the winding will be nearly

Solution: QUESTION: 92

Temperature coefficient of resistance is expressed in terms of

Solution:
QUESTION: 93

For the same peak value of voltage which wave will have the highest rms value ?

Solution:
QUESTION: 94

A wire 2.5m long is bent into a square. A current of 100 A flowing through the wire will produce
a magnetising force at the centre of the square, equal to

Solution:
QUESTION: 95

Common base configuration is little used because

Solution:
QUESTION: 96

The decrease in terminal voltage of a shunt generator is due to

Solution:
QUESTION: 97

The armature voltage control is considered as suitable, in case the dc machine is driven at

Solution:
QUESTION: 98

Interpoles are usually wound with

Solution:
QUESTION: 99

If the flux of dc motor approaches zero

Solution:
QUESTION: 100

Which of the following is not a routine test on transformers

Solution:
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