ELECTRONICS ENGINEERING- PAGE 4
ELECTRONICS ENGINEERING- PAGE 4 MCQs
1:-The capacity of a battery is expressed in
A:-Amperes B:-Ampere-hour C:-Watts D:-Watt-hour
Ans: B
2:-Speed of a universal motor is
A:-Dependent on frequency of supply B:-Proportiona| to frequency of supply C:-Independent of frequency of supply D:-None of these
Ans: C
3:-A cylindrical wire one meter in length has a resistance of 1000. What would be the resistance of wire made from the same material if both the length and cross-sectional area are doubled?
A:-200 ohm B:-400 ohm C:-100 ohm D:-50 ohm
Ans: C
4:-Semi conductor have _ temperature Co-efficient
A:-Zero B:-Positive C:-Negative D:-None of these
Ans: C
5:-Power factor of a R-L-C parallel circuit is
A:-zero B:-0.8 lagging C:-0.8 leading D:-Unity Ans: D
6:-_ damping method is common in moving coil instrument A:-Eddy current B:-F|uid C:-Air D:-Spring Ans: A
7:-An auto-transformer consists of 200 turns. Winding is connected to 200V AC supply main for getting 24V output. The winding should be tapped at _ turns number A:-12 B:-24 C:-100 D:-72 Ans: B
8:-a six pole induction motor is connected to 50 c/s supply. It is running at 970 rpm. Find the percentage of slip A:-30% B:-0.3% C:-0.03%
D:-3% Ans: D
9:-The material used for fuse must have A:-Low melting point and high specific resistance B:-Low melting point and any specific resistance C:-Low melting point and low specific resistance D:-High melting point and low specific resistance Ans: A
10:-In an inductive circuit, the inductance of 0.02 Henry is connected to 200 V, 50 c/s supply. Inductive reactance IS A:-628Ω B:-62.8 Ω C:-6.28 Ω D:-6280 Ω Ans: C
11:-The overall thickness of a LED is abaout A:-1.5 cm B:-2.5 cm C:-3.5 cm D:-4.5 cm Ans: B
12-A LCD panel is not a self illuminated panel. For illuminating this panel _ are used as backlight devicesA:-100 w lamp B:-20 w fluorescent tube C:-CCFL D:-E|ectric arc lamp Ans: C
13:-The contract ratio for the LED TV is defined as A:-The difference b/w bright and dark portions B:-The difference b/w most bright and most dark portions C:-The most bright portion divided by most dark portions D:-The most bright portion into most dark portion Ans: B
14:-LCD/LED display panel are usually made in A:-1 cm to 100 cm B:-2.5 cm to 125 cm C:-3 cm to 300 cm D:-6 cm to 160 cm Ans: D
15:-semi automatic washing machine conist of 2 tubs one is wash tub and the other is A:-Spin tub B:-Agitator tub C:-Pu|sator tub D:-C|eaning tub Ans: A
16:-Genera||y the HP of motor used in a washing machine is A:-0.1 to 0.15 HP 3:03 to 0.5 HP C:-1.0 to 3.0 HP D:-1.5 to 3.5 HP Ans: B
17:-A microwave oven works on _ frequency A:-1.45GHz B:-2.45GHz C:-3.45GHz D:-1.5 - 3.5GHz Ans: B
18:-A vacuum cleaner cleans carpets etc on the principle of A:-Radiation B:-Suction C:-Dispersion D:-Absorption Ans: B
19:-A vacuum cleaner does not run but gives buzzing sound when the defect lies in its A:-Main fuse B:-Socket C:-Armature winding D:-Capacitor Ans: C
20:-A mixer grinder grinds food grains by employing A:-2 grinding stones B:-High speed spinning blade C:-Low speed spinning blade D:-Crushing blade Ans: B
21:-The testing of a mixer grinder is called _ A:-|nching B:-P|ugging C:-Loading D:-Mixing Ans: A
22:-KU band used for satellite communication is _ A:-10.0 to 19.0 GHz B:-10.7 to 19.7 GHz C:-20.0 to 31.0 GHz D:-20.7 to 31.7 GHz Ans: B
23:-Frequency band referred as 6/4 GHz is named as A:-L band B:-C band C:-KU band D:-KA band Ans: B
24:-A dish antennae used in DTH service consist of a paraboloid reflector of about _ diameter A:-15 cm to 30 cm B:-25 cm to 50 cm C:-45 cm to 90 cm D:-115 cm to 150 cm Ans: C
25:-The overall thickness of a LED is abaout A:-1.5 cm B:-2.5 cm C:-3.5 cm D:-4.5 cm Ans: B
26:-A LCD panel is not a self illuminated panel. For illuminating this panel _ are used as backlight devices A:-100 w lamp B:-20 w fluorescent tube C:-CCFL D:-E|ectric arc lamp Ans: C
27:-The contract ratio for the LED TV is defined as A:-The difference b/w bright and dark portions B:-The difference b/w most bright and most dark portions C:-The most bright portion divided by most dark portions D:-The most bright portion into most dark portion Ans: B
28:-LCD/LED display panel are usually made in A:-1 cm to 100 cm B:-2.5 cm to 125 cm C:-3 cm to 300 cm D:-6 cm to 160 cm Ans: D
29:-A solar panel is usually designed to generate _ volts DC A:-1-2 V B:-3-5 V C:-6-7 V D:-12-20 V Ans: D
30:-Which device is used in remote control operated electronic equipment to work as an acceptor for the remote signal A:-Zener diode B:-Photo diode C:-IR LED D:-Photo voltaic cell Ans: B
31:-Solar energy is _ resource of energy A:-Consumab|e B:-Renewab|e C:-Dangerous D:-Neg|igib|e Ans: B
32:-The unit of modulation index is A:-Unit|ess B:-Hertz C:-Vo|t D:-Vo|t/microsecond Ans: A
33:-Whenever there is a temperature gradient in a conductive material, an e.m.f will induce and the gradient of voltage is proportional to the gradient in temperature. This is known as A:-Stroboscopic effect B:-Seebeck effect C:-Ha|| effect D:-Esaki effect Ans: B
34:-The working of OFC is based on the principle A:-Tota| internal reflection B:-Tota| internal defraction C:-Tota| internal refraction D:-Tota| radiation Ans: A
35:-Which value of BCD input activates all segments of the seven segment decoder IC 7447 A:-1001 B:-1111 C:-1000 D:-0000 Ans: C
36:-The wavelength of 2-GHz wave is:
A:-15 cm B:-15 mm
C:-1.5 cm D:-1.5 mm
Ans: A
37:-The cross talk due to the electromagnetic interferance can be eliminated by A:-P|acing a high value inductor in series with the transmission line B:-Using capacitance network in parallel with the transmission line C:-Twisting the copper wires D:-A stub of appropriate length is placed at some distance from the load Ans: C
38:-The insulation thickness in conductor of a cable depend on A:-power handling ability of cable B:-App|ied voltage C:-Current carrying capability of cable D:-The length of the cable Ans: B
39:-|n multi digit seven segment displays, the Ripple Blank Input and Ripple Blank Outputs are used for A:-Dynamic display in order to save power and to increase the life of the display B:-B|ank out the all the zeros and make it look more intelligent C:-Cascading the display otherwise displays not works synchronously D:-B|ank out the leading zeros and make it look more intelligent Ans: D
40:-A 1KVA, 12V on|ine ups connected to a load of 500 Watts, the battery used is 100Ah, then what will be the back up time if the losses are negligible A:-120 minutes B:-2 hour and 40 minutes C:-144 minutes D:-2.6 hours Ans: C
41:-Candela is the unit for A:-Light flux B:-Luminous intensity C:-Wave|ength D:-Luminous efficiency Ans: B
42:-Which of the following is not true in case of a D50. A:-The waveforms are stored in memory to enable them to be processed as needed. B:-The accuracy of D50 is higher than that of analogue scopes C:-|t is possible to programme the D50 to high level of functionality D:-|t has low input impedance which enables the conversion of ADC faster Ans: D
43:-Manganin is the alloy of A:-Copper, Manganese and Nickel B:-Copper, Magnesium and Nickel C:-Manganese, Gallium, Nickel and Iron D:-Manganese, Copper,Ga|lium, Nickel Ans: A
44:-Which type of transducer is generally used in electronic weighing machines A:-Inductive B:-Capacitive C:-Resistive D:-A|| of the above Ans: C
45:-What will be the output when one of the Zener diode short in the zener diode peak clipper A:-On|y one half cycle in the output which resembles halfwave rectifier output B:-No output due to the short circuited zener diode C:-The output is only the peak portion of one half cycle D:-The output is the peak clipped halfwave output Ans: D
46:-At room temperature, a silicon crystal act like
A:-Conductor B:-Insu|ator C:-Semiconductor D:-Super conductor Ans: B
47:-Which of the following solid state device is fastest A:-BJT B:-|GBT C:-MOSFET D:-SCR Ans: C
48:-Which of the following is not true in companding A:-Compressing the signal before input to an Analog to digital converter B:-Which expanding the signal after a Digital to analog converter C:-It increases the signal to noise ratio (SNR) at rreduced bit rates D:-Higher SnR can be achieved by uniform quantization rather than non uniform Ans: D
49:-What is the effective band width of a two stage cascaded amplifier each having a band width of one mega hertz(1MHz) A:-640KHz B:-1640KHz C:-885KHz D:-500KHz Ans: A
50:-What is the maximum allowable tracking error frequency in amplitude modulation A:-+/— 1KHz B:-+/— 2KHz C:-+/— 3 KHz D:-+/— 5KHz Ans: C
A:-Amperes B:-Ampere-hour C:-Watts D:-Watt-hour
Ans: B
2:-Speed of a universal motor is
A:-Dependent on frequency of supply B:-Proportiona| to frequency of supply C:-Independent of frequency of supply D:-None of these
Ans: C
3:-A cylindrical wire one meter in length has a resistance of 1000. What would be the resistance of wire made from the same material if both the length and cross-sectional area are doubled?
A:-200 ohm B:-400 ohm C:-100 ohm D:-50 ohm
Ans: C
4:-Semi conductor have _ temperature Co-efficient
A:-Zero B:-Positive C:-Negative D:-None of these
Ans: C
5:-Power factor of a R-L-C parallel circuit is
A:-zero B:-0.8 lagging C:-0.8 leading D:-Unity Ans: D
6:-_ damping method is common in moving coil instrument A:-Eddy current B:-F|uid C:-Air D:-Spring Ans: A
7:-An auto-transformer consists of 200 turns. Winding is connected to 200V AC supply main for getting 24V output. The winding should be tapped at _ turns number A:-12 B:-24 C:-100 D:-72 Ans: B
8:-a six pole induction motor is connected to 50 c/s supply. It is running at 970 rpm. Find the percentage of slip A:-30% B:-0.3% C:-0.03%
D:-3% Ans: D
9:-The material used for fuse must have A:-Low melting point and high specific resistance B:-Low melting point and any specific resistance C:-Low melting point and low specific resistance D:-High melting point and low specific resistance Ans: A
10:-In an inductive circuit, the inductance of 0.02 Henry is connected to 200 V, 50 c/s supply. Inductive reactance IS A:-628Ω B:-62.8 Ω C:-6.28 Ω D:-6280 Ω Ans: C
11:-The overall thickness of a LED is abaout A:-1.5 cm B:-2.5 cm C:-3.5 cm D:-4.5 cm Ans: B
12-A LCD panel is not a self illuminated panel. For illuminating this panel _ are used as backlight devicesA:-100 w lamp B:-20 w fluorescent tube C:-CCFL D:-E|ectric arc lamp Ans: C
13:-The contract ratio for the LED TV is defined as A:-The difference b/w bright and dark portions B:-The difference b/w most bright and most dark portions C:-The most bright portion divided by most dark portions D:-The most bright portion into most dark portion Ans: B
14:-LCD/LED display panel are usually made in A:-1 cm to 100 cm B:-2.5 cm to 125 cm C:-3 cm to 300 cm D:-6 cm to 160 cm Ans: D
15:-semi automatic washing machine conist of 2 tubs one is wash tub and the other is A:-Spin tub B:-Agitator tub C:-Pu|sator tub D:-C|eaning tub Ans: A
16:-Genera||y the HP of motor used in a washing machine is A:-0.1 to 0.15 HP 3:03 to 0.5 HP C:-1.0 to 3.0 HP D:-1.5 to 3.5 HP Ans: B
17:-A microwave oven works on _ frequency A:-1.45GHz B:-2.45GHz C:-3.45GHz D:-1.5 - 3.5GHz Ans: B
18:-A vacuum cleaner cleans carpets etc on the principle of A:-Radiation B:-Suction C:-Dispersion D:-Absorption Ans: B
19:-A vacuum cleaner does not run but gives buzzing sound when the defect lies in its A:-Main fuse B:-Socket C:-Armature winding D:-Capacitor Ans: C
20:-A mixer grinder grinds food grains by employing A:-2 grinding stones B:-High speed spinning blade C:-Low speed spinning blade D:-Crushing blade Ans: B
21:-The testing of a mixer grinder is called _ A:-|nching B:-P|ugging C:-Loading D:-Mixing Ans: A
22:-KU band used for satellite communication is _ A:-10.0 to 19.0 GHz B:-10.7 to 19.7 GHz C:-20.0 to 31.0 GHz D:-20.7 to 31.7 GHz Ans: B
23:-Frequency band referred as 6/4 GHz is named as A:-L band B:-C band C:-KU band D:-KA band Ans: B
24:-A dish antennae used in DTH service consist of a paraboloid reflector of about _ diameter A:-15 cm to 30 cm B:-25 cm to 50 cm C:-45 cm to 90 cm D:-115 cm to 150 cm Ans: C
25:-The overall thickness of a LED is abaout A:-1.5 cm B:-2.5 cm C:-3.5 cm D:-4.5 cm Ans: B
26:-A LCD panel is not a self illuminated panel. For illuminating this panel _ are used as backlight devices A:-100 w lamp B:-20 w fluorescent tube C:-CCFL D:-E|ectric arc lamp Ans: C
27:-The contract ratio for the LED TV is defined as A:-The difference b/w bright and dark portions B:-The difference b/w most bright and most dark portions C:-The most bright portion divided by most dark portions D:-The most bright portion into most dark portion Ans: B
28:-LCD/LED display panel are usually made in A:-1 cm to 100 cm B:-2.5 cm to 125 cm C:-3 cm to 300 cm D:-6 cm to 160 cm Ans: D
29:-A solar panel is usually designed to generate _ volts DC A:-1-2 V B:-3-5 V C:-6-7 V D:-12-20 V Ans: D
30:-Which device is used in remote control operated electronic equipment to work as an acceptor for the remote signal A:-Zener diode B:-Photo diode C:-IR LED D:-Photo voltaic cell Ans: B
31:-Solar energy is _ resource of energy A:-Consumab|e B:-Renewab|e C:-Dangerous D:-Neg|igib|e Ans: B
32:-The unit of modulation index is A:-Unit|ess B:-Hertz C:-Vo|t D:-Vo|t/microsecond Ans: A
33:-Whenever there is a temperature gradient in a conductive material, an e.m.f will induce and the gradient of voltage is proportional to the gradient in temperature. This is known as A:-Stroboscopic effect B:-Seebeck effect C:-Ha|| effect D:-Esaki effect Ans: B
34:-The working of OFC is based on the principle A:-Tota| internal reflection B:-Tota| internal defraction C:-Tota| internal refraction D:-Tota| radiation Ans: A
35:-Which value of BCD input activates all segments of the seven segment decoder IC 7447 A:-1001 B:-1111 C:-1000 D:-0000 Ans: C
36:-The wavelength of 2-GHz wave is:
A:-15 cm B:-15 mm
C:-1.5 cm D:-1.5 mm
Ans: A
37:-The cross talk due to the electromagnetic interferance can be eliminated by A:-P|acing a high value inductor in series with the transmission line B:-Using capacitance network in parallel with the transmission line C:-Twisting the copper wires D:-A stub of appropriate length is placed at some distance from the load Ans: C
38:-The insulation thickness in conductor of a cable depend on A:-power handling ability of cable B:-App|ied voltage C:-Current carrying capability of cable D:-The length of the cable Ans: B
39:-|n multi digit seven segment displays, the Ripple Blank Input and Ripple Blank Outputs are used for A:-Dynamic display in order to save power and to increase the life of the display B:-B|ank out the all the zeros and make it look more intelligent C:-Cascading the display otherwise displays not works synchronously D:-B|ank out the leading zeros and make it look more intelligent Ans: D
40:-A 1KVA, 12V on|ine ups connected to a load of 500 Watts, the battery used is 100Ah, then what will be the back up time if the losses are negligible A:-120 minutes B:-2 hour and 40 minutes C:-144 minutes D:-2.6 hours Ans: C
41:-Candela is the unit for A:-Light flux B:-Luminous intensity C:-Wave|ength D:-Luminous efficiency Ans: B
42:-Which of the following is not true in case of a D50. A:-The waveforms are stored in memory to enable them to be processed as needed. B:-The accuracy of D50 is higher than that of analogue scopes C:-|t is possible to programme the D50 to high level of functionality D:-|t has low input impedance which enables the conversion of ADC faster Ans: D
43:-Manganin is the alloy of A:-Copper, Manganese and Nickel B:-Copper, Magnesium and Nickel C:-Manganese, Gallium, Nickel and Iron D:-Manganese, Copper,Ga|lium, Nickel Ans: A
44:-Which type of transducer is generally used in electronic weighing machines A:-Inductive B:-Capacitive C:-Resistive D:-A|| of the above Ans: C
45:-What will be the output when one of the Zener diode short in the zener diode peak clipper A:-On|y one half cycle in the output which resembles halfwave rectifier output B:-No output due to the short circuited zener diode C:-The output is only the peak portion of one half cycle D:-The output is the peak clipped halfwave output Ans: D
46:-At room temperature, a silicon crystal act like
A:-Conductor B:-Insu|ator C:-Semiconductor D:-Super conductor Ans: B
47:-Which of the following solid state device is fastest A:-BJT B:-|GBT C:-MOSFET D:-SCR Ans: C
48:-Which of the following is not true in companding A:-Compressing the signal before input to an Analog to digital converter B:-Which expanding the signal after a Digital to analog converter C:-It increases the signal to noise ratio (SNR) at rreduced bit rates D:-Higher SnR can be achieved by uniform quantization rather than non uniform Ans: D
49:-What is the effective band width of a two stage cascaded amplifier each having a band width of one mega hertz(1MHz) A:-640KHz B:-1640KHz C:-885KHz D:-500KHz Ans: A
50:-What is the maximum allowable tracking error frequency in amplitude modulation A:-+/— 1KHz B:-+/— 2KHz C:-+/— 3 KHz D:-+/— 5KHz Ans: C
51:-The 78XX series regulator Ics are commonly found in the through hole package of A:-T0 92 B:-T0 220 C:-T0 18 D:-T0 206A Ans: B
52:-The decimal number 16 is equivalent to the hexadecimal A:-11H B:-10H C:-A0 H D:-01H Ans: B
53:-PWM can be generated by A:-Astab|e multivibrator B:-Bistab|e multivibrator C:-Monostab|e multivibrator D:-Schmitt trigger Ans: C
54:-During the counting because of noise spikes, the counter may goes to some unused state and the subsequent clock pulses may causes the counter to move from one unused state to another unused state is known as A:-Lockout B:-F|y Wheel C:-Corona D:-Moore Ans: A
55:-Which colour LEDs has the highest forward voltage drop generally
A:-Red B:-B|ue C:-Green D:-White
Ans: D
56:-A half wave dipole at a frequency of 200 MHz has a length of A:-200 metre B:-1.5 metre C:-3 metre D:-6 m Ans: B
57:-The thickness of PCB used for surface mount devices is A:-0.8 mm to 1 mm B:-1.5 mm to 2 mm C:-0.2 mm to 2 mm D:-above 2 mm Ans: A
58:-Which of the following is not a feature or advantage of FPGS over micro controller A:-FPGA doesn't have a fixed hardware structure B:-Abi|ity of parallel processing C:-Process larger data with few clock cycle D:-Low cost Ans: D
59:-The LEDs operate in visible range, only when the semiconductor should have the band gap energy A:-Above 3.2eV B:-Between 1.4 to 3.0eV C:-Less than 1eV D:-Between 1eV to 1.32eV Ans: B
60:-Which of the following is a photo emissive material A:-Se|enium B:-Te|urium C:-Po|onium D:-Cesium silver Ans: D
61:-Which of the following is a non-renewable source of energy A:-Tida| power B:-Geotherma| energy C:-Nuc|ear energy D:-Wind power Ans: C
62:-The electrical apparatus that provides power to load when mains power fails is known as A:-USB B:-UPS C:-UCP D:-UPC Ans: B
63:-Which one of the following is an impact printer A:-Dot matrix B:-|nkjet C:-Laser D:-None of these Ans: A
64:-The maximum operating voltage of LCD panel may be A:-100v B:-10v C:-1v D:-0.1v Ans: C
65:-The maximum usual idagonal six of the LCD panel is
A:-160cm B:-260cm
C:-360cm D:-460cm
Ans: A
66:-The principle of LCD display is A:-Twisted pneumatic B:-Pneumatics C:-Thermocoup|e D:-Vaccum display Ans: A
67:-In a 7 segment display system the decimal point is displayed by A:-any one of the 7 bit B:-f bit C:-a separate 8th bit D:-g bit Ans: C
68:-An UPS which does not require inverter is _ A:-On|ine UPS B:-Off|ine UPS C:-DC power UPS D:-Line interactive UPS Ans: C
69:-In a UPS the failure of AC input supply is indicated by A:-Red lightnonly B:-A buzzer on|y C:-Both red light and buzzer D:-None of these Ans: C
70:-The desirable changeover period for a UPS is _ A:-2 ms B:-5 ms C:-10 ms D:-1 ms Ans: D
71:-|n a conductor the resistance changes with _ A:-Vo|tage B:-Temperature C:-Current D:-Humidity Ans: B
72:-The letter C is the symbol for _ A:-Impedance B:-Capacitance C:-Current D:-Charge Ans: D
73:-An ideal volt meter is connecting to a 200 V supply having internal resistance of 10 ohms. What will be the reading of the volt meter A:-Exact 20 Volt B:-Just below 20 Volt C:-Exact 200 Volt D:-Just below 200 Volt Ans: C
74:-Which of the following diode is used in detector stage of an AM receiver A:-OA 79 B:-BY 127 C:-IN4001 D:-A|| of the above Ans: A
75:-In low frequency transformers the core materials are generally soft silicon steel because A:-They are having large hysteresis loop area B:-They are having least coercivity C:-They are having high coercivity D:-High retentivity Ans: B
76:-the expected energy of electrons at absolute zero is known as A:-Work function B:-Fermi level energy C:-Emission energy D:-Forbidden energy Ans: B
77:-The first storage location of stack operation in 8051 microcontroller is
A:-00H B:-01H C:-07H D:-08H
Ans: D
78:-After the execution of the instruction "move A, 20H" A:-Accumulator content is the content of the memory location 20H B:-Accumulator content is 20H C:-The content of accumulator moves to the memory location 20 H D:-The stack pointer points to the memory location 20H Ans: A
79:-MOV A, @RO is A:-Register addressing B:-Indexed addressing C:-Register indirect addressing D:-Immediate addressing Ans: C
80:-The one and only register inside the CPU holds 16 bit address of the instructions is A:-DPTR B:-Program counter C:-Stack pointer D:-Instruction decoder Ans: B
52:-The decimal number 16 is equivalent to the hexadecimal A:-11H B:-10H C:-A0 H D:-01H Ans: B
53:-PWM can be generated by A:-Astab|e multivibrator B:-Bistab|e multivibrator C:-Monostab|e multivibrator D:-Schmitt trigger Ans: C
54:-During the counting because of noise spikes, the counter may goes to some unused state and the subsequent clock pulses may causes the counter to move from one unused state to another unused state is known as A:-Lockout B:-F|y Wheel C:-Corona D:-Moore Ans: A
55:-Which colour LEDs has the highest forward voltage drop generally
A:-Red B:-B|ue C:-Green D:-White
Ans: D
56:-A half wave dipole at a frequency of 200 MHz has a length of A:-200 metre B:-1.5 metre C:-3 metre D:-6 m Ans: B
57:-The thickness of PCB used for surface mount devices is A:-0.8 mm to 1 mm B:-1.5 mm to 2 mm C:-0.2 mm to 2 mm D:-above 2 mm Ans: A
58:-Which of the following is not a feature or advantage of FPGS over micro controller A:-FPGA doesn't have a fixed hardware structure B:-Abi|ity of parallel processing C:-Process larger data with few clock cycle D:-Low cost Ans: D
59:-The LEDs operate in visible range, only when the semiconductor should have the band gap energy A:-Above 3.2eV B:-Between 1.4 to 3.0eV C:-Less than 1eV D:-Between 1eV to 1.32eV Ans: B
60:-Which of the following is a photo emissive material A:-Se|enium B:-Te|urium C:-Po|onium D:-Cesium silver Ans: D
61:-Which of the following is a non-renewable source of energy A:-Tida| power B:-Geotherma| energy C:-Nuc|ear energy D:-Wind power Ans: C
62:-The electrical apparatus that provides power to load when mains power fails is known as A:-USB B:-UPS C:-UCP D:-UPC Ans: B
63:-Which one of the following is an impact printer A:-Dot matrix B:-|nkjet C:-Laser D:-None of these Ans: A
64:-The maximum operating voltage of LCD panel may be A:-100v B:-10v C:-1v D:-0.1v Ans: C
65:-The maximum usual idagonal six of the LCD panel is
A:-160cm B:-260cm
C:-360cm D:-460cm
Ans: A
66:-The principle of LCD display is A:-Twisted pneumatic B:-Pneumatics C:-Thermocoup|e D:-Vaccum display Ans: A
67:-In a 7 segment display system the decimal point is displayed by A:-any one of the 7 bit B:-f bit C:-a separate 8th bit D:-g bit Ans: C
68:-An UPS which does not require inverter is _ A:-On|ine UPS B:-Off|ine UPS C:-DC power UPS D:-Line interactive UPS Ans: C
69:-In a UPS the failure of AC input supply is indicated by A:-Red lightnonly B:-A buzzer on|y C:-Both red light and buzzer D:-None of these Ans: C
70:-The desirable changeover period for a UPS is _ A:-2 ms B:-5 ms C:-10 ms D:-1 ms Ans: D
71:-|n a conductor the resistance changes with _ A:-Vo|tage B:-Temperature C:-Current D:-Humidity Ans: B
72:-The letter C is the symbol for _ A:-Impedance B:-Capacitance C:-Current D:-Charge Ans: D
73:-An ideal volt meter is connecting to a 200 V supply having internal resistance of 10 ohms. What will be the reading of the volt meter A:-Exact 20 Volt B:-Just below 20 Volt C:-Exact 200 Volt D:-Just below 200 Volt Ans: C
74:-Which of the following diode is used in detector stage of an AM receiver A:-OA 79 B:-BY 127 C:-IN4001 D:-A|| of the above Ans: A
75:-In low frequency transformers the core materials are generally soft silicon steel because A:-They are having large hysteresis loop area B:-They are having least coercivity C:-They are having high coercivity D:-High retentivity Ans: B
76:-the expected energy of electrons at absolute zero is known as A:-Work function B:-Fermi level energy C:-Emission energy D:-Forbidden energy Ans: B
77:-The first storage location of stack operation in 8051 microcontroller is
A:-00H B:-01H C:-07H D:-08H
Ans: D
78:-After the execution of the instruction "move A, 20H" A:-Accumulator content is the content of the memory location 20H B:-Accumulator content is 20H C:-The content of accumulator moves to the memory location 20 H D:-The stack pointer points to the memory location 20H Ans: A
79:-MOV A, @RO is A:-Register addressing B:-Indexed addressing C:-Register indirect addressing D:-Immediate addressing Ans: C
80:-The one and only register inside the CPU holds 16 bit address of the instructions is A:-DPTR B:-Program counter C:-Stack pointer D:-Instruction decoder Ans: B
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