Electrical Engineering Quiz 21
1 / 50
Which of the following devices may be used for extending the range of instruments ?
2 / 50
The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________?
3 / 50
The speed of a superfast train is______________?
4 / 50
Which quantity should be measured by the voltmeter ?
5 / 50
By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
6 / 50
In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output
7 / 50
The speed of a D.C. shunt motor can be increased by_______________?
8 / 50
In a cable immediately above metallic sheath ______ is provided
9 / 50
Millman?s theorem yields____________?
10 / 50
The speed of a D.C. series motor is_____________?
11 / 50
The resistance of an ideal voltmeter is ______________?
12 / 50
A capacitor is generally a____________?
13 / 50
A resonant circuit contains ____________elements?
14 / 50
The sensitivity of a multimeter is given in _______________?
15 / 50
An SCR is sometimes called ____________?
16 / 50
The operating speed of a synchronous motor can be changed to new fixed value by___________?
17 / 50
SI unit of the permittivity of free space is________________?
18 / 50
A fuse is connected_______________?
19 / 50
The maximum collector efficiency of class B operation is ________________?
20 / 50
The transition temperature of mercury is____________?
21 / 50
A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
22 / 50
Which of the following is the major consideration to evolve a good design ?
23 / 50
Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
24 / 50
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
25 / 50
The materil used to coat inside the face of CRT is ______________?
26 / 50
The hysteresis loss in a D.C. machine least depends on____________?
27 / 50
In the case of a lossy capacitor, its series equivalent resistance value will be_______________?
28 / 50
A hole in a semiconductor is defined as_________________?
29 / 50
A turbine is tripped when ?
30 / 50
Which of the following motors is preferred when quick speed reversal is the main consideration ?
31 / 50
For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?
32 / 50
In a transistor ______________?
33 / 50
Cylindrical windings using circular conductors, employed in transformers, are_____________?
34 / 50
The fuse rating is expressed in terms of_____________?
35 / 50
The voltage induced in an inductor is represented as,
36 / 50
Demand factor is defined as___________?
37 / 50
Short circuiting of a cell may be caused____________?
38 / 50
A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?
39 / 50
The Biot-savart?s law is a general modification of_______________?
40 / 50
In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?
41 / 50
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?
42 / 50
Which one of the following can be taken as the measure of electric intensity ?
43 / 50
The maximum speed variation in a 3-phase synchronous motor is____________?
44 / 50
The efficiency of two identical transformers under load conditions can be determined by_______________?
45 / 50
The square root of the ratio of line impedance and shunt admittance is called the___________?
46 / 50
A common-mode signal is applied to ________________?
47 / 50
In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?
48 / 50
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
49 / 50
An ideal value of stability factor is________________?
50 / 50
One newton meter is same as_____________?
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