Test: Mechanical Engineering- 15


100 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Test: Mechanical Engineering- 15


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This mock test of Test: Mechanical Engineering- 15 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. This contains 100 Multiple Choice Questions for Mechanical Engineering Test: Mechanical Engineering- 15 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Mechanical Engineering- 15 quiz give you a good mix of easy questions and tough questions. Mechanical Engineering students definitely take this Test: Mechanical Engineering- 15 exercise for a better result in the exam. You can find other Test: Mechanical Engineering- 15 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above.
QUESTION: 1

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

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QUESTION: 2

To avoid arcing, connect suitable value of in earthing

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QUESTION: 3

What is the value of the current I in the circuit shown below ?

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QUESTION: 4

In the following type of conductors the corona is minimum in

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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?

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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

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QUESTION: 7

The machine used in wind will is

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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 ?

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QUESTION: 9

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

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QUESTION: 10

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

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QUESTION: 11

Positive sequence terminal voltage is zero in

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QUESTION: 12

.Most economical load in the underground cable is

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QUESTION: 13

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

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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
 

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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
 

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QUESTION: 16

Torque/weight ratio of an instrument indicates

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QUESTION: 17

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

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QUESTION: 18

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

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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

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QUESTION: 20

The transformer laminations are insulated from each other by

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QUESTION: 21

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

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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

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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

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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

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QUESTION: 25

Which of the following application requires high starting torque ?

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QUESTION: 26

Which DC motor will be preferred for machine tools ?

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QUESTION: 27

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

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QUESTION: 28

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

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QUESTION: 29

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

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QUESTION: 30

Disadvantage of low p.f. is

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QUESTION: 31

For improvement of power factor

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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 ?

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QUESTION: 33

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

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QUESTION: 34

Stepped core is used in transformers in order to reduce

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QUESTION: 35

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

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QUESTION: 36

Which instrument is the cheapest, disregarding the accuracy

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QUESTION: 37

In dc machines, the armature reaction mmf is

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QUESTION: 38

Inductance affects the flow of direct current at the time of

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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

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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

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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

 

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QUESTION: 42

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

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QUESTION: 43

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

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QUESTION: 44

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

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QUESTION: 45

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

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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

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QUESTION: 47

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

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QUESTION: 48

A reactance relay is

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QUESTION: 49

To limit current chopping in vacuum circuit breakers, the contact

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QUESTION: 50

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

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QUESTION: 51

Which of the following relay has directional feature

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QUESTION: 52

Carbon brushes are preferable to copper brushes because

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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

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QUESTION: 54

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

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QUESTION: 55

Quadrilateral speed-time curve is the closer approximation for

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QUESTION: 56

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

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QUESTION: 57

For Domestic wiring method commonly used is

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QUESTION: 58

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

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QUESTION: 59

Ripple factor of half wave rectifier is

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QUESTION: 60

Which one is unipolar transistor

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QUESTION: 61

A polarized electrolytic capacitor can be used

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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

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QUESTION: 63

Which of the following motors are used in tape recorders

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QUESTION: 64

Which motor would you select for vacuum cleaner

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QUESTION: 65

A tank circuit consist of

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QUESTION: 66

The commulator in a dc machine acts as

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QUESTION: 67

Ferranti effect on transmission line is a phenomenon which represents

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QUESTION: 68

EHV cables are filled with thin oil under pressure

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QUESTION: 69

Arcing on transmission lines is prevented by connecting a suitable

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QUESTION: 70

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

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QUESTION: 71

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

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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

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QUESTION: 73

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

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QUESTION: 74

Lightening surges are arrested by

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QUESTION: 75

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

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QUESTION: 76

176. For the wave given below, the rms value will be

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QUESTION: 77

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

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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

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QUESTION: 79

Illumination level required for precision work is around