question stringlengths 4 4.67k | subject stringclasses 57 values | category listlengths 4 4 | answer stringclasses 4 values |
|---|---|---|---|
Which of the following conditions are necessary for a series to be classifiable as a weakly stationary process?
(i) It must have a constant mean
(ii) It must have a constant variance
(iii) It must have constant autocovariances for given lags
(iv) It must have a constant probability distribution | econometrics | [
"(ii) and (iv) only",
"(i) and (iii) only",
"(i), (ii), and (iii) only",
"(i), (ii), (iii), and (iv)"
] | 2 |
Consider the following equation and determine the class of model that it best represents
$y_{it} = \alpha + \beta_{it} + \mu_i + \nu_{it}$ | econometrics | [
"An entity fixed effects model",
"A time fixed effects model",
"A random effects model",
"A pure time series model"
] | 0 |
Note that statistical tables are not necessary to answer this question. For a sample of 1000 observations, the Dickey-Fuller test statistic values are | econometrics | [
"More negative than (i.e. bigger in absolute value than) those in the left hand tail of a normal distribution",
"Less negative than (i.e. smaller in absolute value than) those in the left hand tail of a normal distribution",
"Obtained from an analytical formula for the density of the Dickey-Fuller distribution"... | 0 |
Suppose that a hypothesis test is conducted using a 5% significance level. Which of the following statements are correct?
(i) The significance level is equal to the size of the test
(ii) The significance level is equal to the power of the test
(iii) 2.5% of the total distribution will be in each tail rejection region for a 2-sided test
(iv) 5% of the total distribution will be in each tail rejection region for a 2-sided test. | econometrics | [
"(ii) and (iv) only",
"(i) and (iii) only",
"(i), (ii), and (iii) only",
"(i), (ii), (iii), and (iv)"
] | 1 |
Which one of the following criticisms of the Dickey-Fuller/Engle-Granger approach to dealing with cointegrated variables is overcome by the Engle-Yoo (EY) procedure? | econometrics | [
"In the context of small samples, Dickey Fuller tests are prone to conclude that there is a unit root in a series when there is not",
"The Engle-Granger (EG) approach can only detect up to one cointegrating relationship even though there could be more than one",
"The variables are treated asymmetrically in the ... | 3 |
Consider a series that follows an MA(1) with zero mean and a moving average coefficient of 0.4. What is the value of the autocovariance at lag 1? | econometrics | [
"0.4",
"1",
"0.34",
"It is not possible to determine the value of the autocovariances without knowing the disturbance variance."
] | 3 |
Which of the following estimation techniques are available for the estimation of over-identified systems of simultaneous equations?
i) OLS
ii) ILS
iii) 2SLS
iv) IV | econometrics | [
"(iii) only",
"(iii) and (iv) only",
"(ii), (iii), and (iv) only",
"(i), (ii), (iii) and (iv)"
] | 1 |
Which one of the following statements best describes a Type II error? | econometrics | [
"It is the probability of incorrectly rejecting the null hypothesis",
"It is equivalent to the power of the test",
"It is equivalent to the size of the test",
"It is the probability of failing to reject a null hypothesis that was wrong"
] | 3 |
Which one of the following would be the most appropriate as a 95% (two-sided) confidence interval for the intercept term of the model given in question 21? | econometrics | [
"(-4.79,2.19)",
"(-4.16,4.16)",
"(-1.98,1.98)",
"(-5.46,2.86)"
] | 3 |
Which of the following are characteristics of a stationary process?
i) It crosses its mean value frequently
ii) It has constant mean and variance
iii) It contains no trend component
iv) It will be stationary in first difference form | econometrics | [
"(ii) and (iv) only",
"(i) and (iii) only",
"(i), (ii), and (iii) only",
"(i), (ii), (iii), and (iv)"
] | 3 |
Consider again the VAR model of equation 16. Which of the following conditions must hold for it to be said that there is bi-directional feedback? | econometrics | [
"The b and d coefficients significant and the a and c coefficients insignificant",
"The a and c coefficients significant and the b and d coefficients insignificant",
"The a and c coefficients significant",
"The b and d coefficients significant"
] | 3 |
Consider the following sample autocorrelation estimates obtained using 250 data points:
1) Lag 1 2 3
2) Coefficient 0.2 -0.15 -0.1
3) Assuming that the coefficients are approximately normally distributed, which of the coefficients are statistically significant at the 5% level? | econometrics | [
"1 only",
"1 and 2 only",
"1, 2 and 3 only",
"It is not possible to determine the statistical significance since no standard errors have been given"
] | 1 |
Which one of the following is examined by looking at a goodness of fit statistic? | econometrics | [
"How well the population regression function fits the data",
"How well the sample regression function fits the population regression function",
"How well the sample regression function fits the data",
"How well the population regression function fits the sample regression function."
] | 2 |
Which of the following statements are correct concerning the use of antithetic variates as part of a Monte Carlo experiment?
i) Antithetic variates work by reducing the number of replications required to cover the whole probability space
ii) Antithetic variates involve employing a similar variable to that used in the simulation, but whose properties are known analytically
iii) Antithetic variates involve using the negative of each of the random draws and repeating the experiment using those values as the draws
iv) Antithetic variates involve taking one over each of the random draws and repeating the experiment using those values as the draws | econometrics | [
"(ii) and (iv) only",
"(i) and (iii) only",
"(i), (ii), and (iv) only",
"(i), (ii), (iii), and (iv)"
] | 1 |
Which one of the following statements is true concerning alternative forecast accuracy measures? | econometrics | [
"Mean squared error is usually highly correlated with trading rule profitability",
"Mean absolute error provides a quadratic loss function",
"Mean absolute percentage error is a useful measure for evaluating asset return forecasts",
"Mean squared error penalises large forecast errors disproportionately more t... | 3 |
Which of the following criticisms of standard ("plain vanilla") GARCH models can be overcome by EGARCH models?
i) Estimated coefficient values from GARCH models may be negative
ii) GARCH models cannot account for leverage effects
iii) The responsiveness of future volatility to positive and negative shocks is symmetric under a GARCH formulation
iv) GARCH models cannot allow for a feedback from the volatility to the returns | econometrics | [
"(ii) and (iv) only",
"(i) and (iii) only",
"(i), (ii), and (iii) only",
"(i), (ii), (iii), and (iv)"
] | 2 |
Suppose that 100 separate firms were tested to determine how many of them "beat the market" using a Jensen-type regression, and it is found that 3 fund managers significantly do so. Does this suggest prima facie evidence for stock market inefficiency? | econometrics | [
"Yes",
"No",
"In order to answer this question, you would need to test every fund manager trading in that market",
"There is insufficient information given in the question to draw a conclusion about market efficiency."
] | 1 |
Which of the following are advantages of the use of panel data over pure cross-sectional or pure time-series modelling?
(i) The use of panel data can increase the number of degrees of freedom and therefore the power of tests
(ii) The use of panel data allows the average value of the dependent variable to vary either cross-sectionally or over time or both
(iii) The use of panel data enables the researcher allows the estimated relationship between the independent and dependent variables to vary either cross-sectionally or over time or both | econometrics | [
"(i) only",
"(i) and (ii) only",
"(ii) only",
"(i), (ii), and (iii)"
] | 1 |
If the Engle-Granger test is applied to the residuals of a potentially cointegrating regression, what would be the interpretation of the null hypothesis? | econometrics | [
"The variables are cointegrated",
"The variables are not cointegrated",
"Both variables are stationary",
"Both variables are non-stationary"
] | 1 |
Which of the following statements are true concerning the autocorrelation function (acf) and partial autocorrelation function (pacf)?
i) The acf and pacf will always be identical at lag one whatever the model
ii) The pacf for an MA(q) model will in general be non-zero beyond lag q
iii) The pacf for an AR(p) model will be zero beyond lag p
iv) The acf and pacf will be the same at lag two for an MA(1) model | econometrics | [
"(ii) and (iv) only",
"(i) and (iii) only",
"(i), (ii), and (iii) only",
"(i), (ii), (iii), and (iv)"
] | 2 |
The Barkhausen criterion for an oscillator | electrical_engineering | [
"Loop gain should be unity",
"Loop gain should be less than unity",
"The phase of a feedback signal with respect to input should be 0° or 360°",
"Both A and C"
] | 3 |
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because | electrical_engineering | [
"It loads the circuit moderately.",
"It loads the circuit to maximum extent.",
"It uses centre zero galvanometer instead of voltmeter.",
"It does not load the circuit at all."
] | 3 |
Which of these sets of logic gates are designated as universal gates? | electrical_engineering | [
"NOR, NAND.",
"XOR, NOR, NAND.",
"OR, NOT, AND.",
"NOR, NAND, XNOR."
] | 0 |
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is | electrical_engineering | [
"30° to 150°.",
"30° to 180°.",
"60° to 120°.",
"60° to 180°."
] | 0 |
A box which tells the effect of inputs on control sub system is known as | electrical_engineering | [
"Data Box.",
"Logical box.",
"Decision box.",
"State box."
] | 2 |
Two infinite parallel metal plates are charged with equal surface charge density of the same polarity. The electric field in the gap between the plates is | electrical_engineering | [
"same as that produced by one plate.",
"double the field produced by one plate.",
"dependent on coordinates of field points.",
"zero."
] | 3 |
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be | electrical_engineering | [
"Low.",
"Very low.",
"High.",
"Almost zero."
] | 2 |
The following are the necessary requirements of an oscillator | electrical_engineering | [
"Amplitude stability",
"Frequency stability",
"Power stability",
"Both A and B"
] | 3 |
The normal voltage used in directional heating is | electrical_engineering | [
"1.5 KV.",
"15 KV.",
"33 KV.",
"66 KV."
] | 0 |
LC oscillators are used for produce a waveform with frequency ranging from | electrical_engineering | [
"1MHz to 500 MHz",
"100 KHz to 500 MHz",
"1 KHz to 1 MHz",
"1MHz to 100 GHz"
] | 0 |
A working diode must have | electrical_engineering | [
"High resistance when forward or reverse biased",
"Low resistance when forward biased, while high resistance when reverse bias",
"High resistance when forward biased, while low resistance when reverse bias",
"Low resistance when forward or reverse biased"
] | 1 |
What is the name of the fluorescent material that gives red colour fluorescence? | electrical_engineering | [
"Zinc silicate.",
"Calcium silicate.",
"Zinc sulphide.",
"Magnesium silicate."
] | 3 |
How many bits are required to store one BCD digit ? | electrical_engineering | [
"1",
"2",
"3",
"4"
] | 3 |
Commutator in DC generator is used for | electrical_engineering | [
"collecting of current",
"reduce losses",
"increase efficiency",
"convert AC armature current in to DC"
] | 3 |
1 F is theoretically equal to | electrical_engineering | [
"1 ohm of resistance",
"ratio of 1 V to 1 C",
"ratio of 1 C to 1 V",
"none of these"
] | 2 |
How many entries will be in the truth table of a 3 input NAND gate ? | electrical_engineering | [
"3",
"6",
"8",
"9"
] | 2 |
In decimal number system what is MSD | electrical_engineering | [
"First digit from left to right",
"First digit from right to left",
"Middle digit",
"Mean of all digits"
] | 0 |
In Digital Logic Designs, GAL is abbreviated as | electrical_engineering | [
"General Advance Logic",
"General Array Logic",
"Generic Advance Logic",
"Generic Array Logic"
] | 3 |
Inintel 8085A microprocessor ALE signal is made high to | electrical_engineering | [
"Enable the data bus to be used as low order address bus",
"To latch data D0-D7 from data bus",
"To disable data bus",
"To achieve all the functions listed above"
] | 0 |
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance? | electrical_engineering | [
"111.9 ohm",
"11.19 ohm",
"108 ohm",
"115 ohm"
] | 0 |
The concept of V/f control of inverters driving induction motors resuls in | electrical_engineering | [
"constant torque operation",
"speed reversal",
"reduced magnetic loss",
"hormonic elimination"
] | 0 |
The energy stored in the magnetic field in a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current at 10 amp, is | electrical_engineering | [
"0.015 joule.",
"0.15 joule.",
"0.015 joule.",
"1.15 joule."
] | 1 |
While operating on variable frequency supplies, the AC motor requires variable voltage in order to | electrical_engineering | [
"protect the insulation.",
"avoid effect of saturation.",
"improve the capabilities of the inverter.",
"protect thyristor from dV / dt."
] | 1 |
Which of the following windings are necessary in case of all dc machines? | electrical_engineering | [
"closed winding",
"lap winding",
"wave winding",
"open type winding"
] | 0 |
Relaxation Voltage controlled oscillators are used to generate | electrical_engineering | [
"Sinusoidal wave",
"Triangular wave",
"Sawtooth wave",
"Both B and C"
] | 3 |
The supply frequency usually employed for high frequency eddy current heating is | electrical_engineering | [
"1 KHz.",
"5 KHz.",
"10 MHz.",
"10 KHz to 400 KHz."
] | 3 |
In the toggle mode a JK flip-flop has | electrical_engineering | [
"J = 0, K = 0.",
"J = 1, K = 1.",
"J = 0, K = 1.",
"J = 1, K = 0."
] | 1 |
Electric drive is becoming more and more popular because | electrical_engineering | [
"all of below.",
"it provide smooth and easy control.",
"it is cheaper in cost.",
"it is simple and reliable."
] | 0 |
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is | electrical_engineering | [
"0.32.",
"0.67.",
"0.45.",
"0.27."
] | 1 |
A Binary number system has how many digits. | electrical_engineering | [
"0",
"1",
"2",
"10"
] | 2 |
Lowest critical frequency is due to pole and it may be present at the origin or nearer to the origin, then the type of network is | electrical_engineering | [
"LC.",
"RL.",
"RC.",
"Any of the above."
] | 2 |
Advantages of open loop control system is/are | electrical_engineering | [
"simple and economical.",
"accurate.",
"reliable.",
"all of the above."
] | 0 |
The voltage induced in an inductor is represented as, | electrical_engineering | [
"product of its inductance and current through it.",
"ratio of its inductance to current through it.",
"ratio of current through it to its inductance.",
"product of its inductance and rate of change of current through it."
] | 3 |
If a Hexadecimal number needs to convert to binary. For each hexadecimal digit, there will be how many bits | electrical_engineering | [
"1",
"2",
"4",
"8"
] | 2 |
Induction heating takes place in | electrical_engineering | [
"conducting but non-magnetic materials.",
"conducting materials which may be either magnetic or non-magentic materials.",
"insulating materials.",
"conducting and magnetic materials."
] | 1 |
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch | electrical_engineering | [
"10",
"100",
"50",
"1"
] | 0 |
Magnetic flux has the unit of | electrical_engineering | [
"Newton",
"Ampere turn",
"Weber",
"Tesla"
] | 2 |
In balanced bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This can be explained from which theorem | electrical_engineering | [
"Reciprocity theorem",
"Thevinin's theorem",
"Norton's theorem",
"Compensation theorem"
] | 0 |
A D-flip-flop is said to be transparent when | electrical_engineering | [
"the output is LOW",
"the output is HIGH",
"the output follows clock",
"the output follow input"
] | 3 |
A Lissajous pattern on an oscilloscope has 5 horinzontal tangencies and 2 vertical tangencies. The frequency of horizontal input is 100 Hz. The frequency of the vertical will be | electrical_engineering | [
"500 Hz.",
"250 Hz.",
"400 Hz.",
"625 Hz."
] | 1 |
Speed control by variation of field flux results in | electrical_engineering | [
"constant power drive.",
"constant torque drive.",
"variable power drive.",
"none of the above."
] | 0 |
Which of the following memories uses one transistor and one capacitor as basic memory unit | electrical_engineering | [
"SRAM",
"DRAM",
"Both SRAM and DRAM",
"None"
] | 1 |
What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m * 3m rectangular room? | electrical_engineering | [
"2",
"4",
"5",
"6"
] | 0 |
The output of the system has an effect upon the input quantity, then the system is a | electrical_engineering | [
"open loop control system.",
"closed loop control system.",
"either A or B.",
"none of the above."
] | 1 |
A sinusoidal signal is analog signal, because | electrical_engineering | [
"it can have a number of values between the negative and positive peaks",
"it is negative for one half cycle",
"it is positive for one half cycle",
"it has positive as well as negative values"
] | 0 |
FM stands for | electrical_engineering | [
"frequent modulation.",
"frequency modulation.",
"frequency moderator.",
"frequent moderator."
] | 1 |
Stack is also known as | electrical_engineering | [
"FIFO memory",
"Flash memory",
"LIFO memory",
"LILO memory"
] | 2 |
In Ward-Leonard system, the lower limit of the speed imposed by | electrical_engineering | [
"Field resistance.",
"Armature resistance.",
"Residual magnetism of the generator.",
"None of above."
] | 2 |
Colpitts oscillator is also called as | electrical_engineering | [
"Tank circuit oscillator",
"LC oscillator",
"Resonant circuit oscillator",
"All of the above"
] | 3 |
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be | electrical_engineering | [
"1500 A.",
"6000 A.",
"2121.32 A.",
"4242.64 A."
] | 2 |
Both the ALU and control section of CPU employ which special purpose storage location? | electrical_engineering | [
"Buffers",
"Decoders",
"Accumulators",
"Registers"
] | 2 |
Systematic errors are | electrical_engineering | [
"environmental errors.",
"observational errors.",
"instrument errors.",
"all of the above."
] | 3 |
Which of the following is/are the disadvantages of an open loop control system? | electrical_engineering | [
"Inaccurate.",
"Unreliable.",
"both A and B.",
"none of the above."
] | 2 |
A diode (p-n junction) when reverse biased act as | electrical_engineering | [
"On Switch",
"Zener diode",
"Capacitor",
"Off Switch"
] | 3 |
Piezoelectric effect is carried out in | electrical_engineering | [
"composite filter.",
"crystal filter.",
"m derived.",
"constant k prototype."
] | 1 |
The resistivity of the conductor depends on | electrical_engineering | [
"area of the conductor.",
"length of the conductor.",
"type of material.",
"none of these."
] | 2 |
The smallest change in measured variable to which instrument will respond is | electrical_engineering | [
"resolution.",
"accuracy.",
"precision.",
"sensitivity."
] | 0 |
In electronic communications, "AM" stands for | electrical_engineering | [
"Amp Modification",
"Amplitude Method",
"Amplitude Modulation",
"Ampere Method"
] | 2 |
Which system is also known as automatic control system? | electrical_engineering | [
"Open loop control system",
"Closed loop control system",
"Either A or B",
"Nether A nor B"
] | 1 |
A combinational PLD with a fixed AND array and a programmable OR array is called a | electrical_engineering | [
"PLD",
"PROM",
"PAL",
"PLA"
] | 1 |
A null type instrument as compared to a deflected type instrument has | electrical_engineering | [
"a lower sensitivity.",
"a faster response.",
"a higher accuracy.",
"all of the above."
] | 2 |
Length of the cable is doubled, its capacitance C will be | electrical_engineering | [
"one-fourth.",
"one-half.",
"doubled.",
"unchanged."
] | 2 |
Electrons in p-type material of a semi-conductor are called as | electrical_engineering | [
"either minority carriers or majority carriers",
"minority carriers",
"majority carriers",
"valance carriers"
] | 1 |
________ is the most detrimental impurity in the magnetic materials | electrical_engineering | [
"Carbon.",
"Sulphur.",
"Oxygen.",
"Nitrogen."
] | 0 |
Voltage controlled oscillators are used commonly in | electrical_engineering | [
"Pulse Modulators Frequency Modulators Phase Clocked loops",
"Frequency Modulators",
"Phase Clocked loops",
"All the above"
] | 3 |
Low frequency supply is necessary for direct core type induction furnaces because | electrical_engineering | [
"With normal frequeny supply the electromagnetic forces causes severe stirring action in the molten metal.",
"Magnetic coupling between the primary and secondary circuit is poor.",
"Both A and B.",
"None of the above."
] | 2 |
The moving coil-meters, damping is provided by | electrical_engineering | [
"the aluminium frame of the coil.",
"the coil spring attached to the moving.",
"eddy current disk.",
"damping vane in the airtight chamber."
] | 0 |
Which of the following is the analogous quantity for mass element in force-voltage analogy? | electrical_engineering | [
"Resistance.",
"Inductance.",
"Capacitance.",
"All of the above."
] | 1 |
A latch is ________ sensitive | electrical_engineering | [
"both level and edge",
"edge",
"level",
"None"
] | 2 |
What is used to protect the SCR from over current ? | electrical_engineering | [
"CB and fuse.",
"Heat sink.",
"Snubber circuit.",
"Voltage clamping device."
] | 0 |
The errors mainly caused by human mistakes are | electrical_engineering | [
"gross error.",
"instrumental error.",
"observational error.",
"systematic error."
] | 0 |
Electrical analogous quantity for dash-pot in force-current analogy is | electrical_engineering | [
"resistance.",
"conductance.",
"inductance.",
"capacitance."
] | 1 |
Which lamp has the best Colour Rendering Index (CRI)? | electrical_engineering | [
"LED",
"Fluorescent",
"Incandescent",
"High pressure sodium vapour"
] | 2 |
Power dissipation in ideal inductor is | electrical_engineering | [
"Maximum",
"Minimum",
"Zero",
"A finite value"
] | 2 |
For intermittent work which of the following furnace is suitable? | electrical_engineering | [
"Core less furnace.",
"Indirect arc furnace.",
"Either of above.",
"Nither of above."
] | 1 |
In electrical resistance welding material of electrode should have | electrical_engineering | [
"higher electrical conductivities.",
"higher thermal conductivities.",
"sufficient strength to sustain high pressure at elevated temperatures.",
"all of above."
] | 3 |
Which of the following are the passive elements? | electrical_engineering | [
"Resistor",
"Bulb",
"Both",
"None of these."
] | 2 |
The main advantage of dielectric heating is that | electrical_engineering | [
"heating occurs in the material itself.",
"heating occurs due to high frequency.",
"it can be used for drying the explosives.",
"None of the above."
] | 0 |
Materials used in heat sink should have | electrical_engineering | [
"high thermal conductivity.",
"large surface area.",
"high melting point.",
"All of these."
] | 3 |
Conductor is static and the field is varying then emf will be induced. This principle is called | electrical_engineering | [
"virtually induced emf.",
"dynamically induced emf.",
"static induced emf.",
"none of these"
] | 2 |
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