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Home » Engineering » Aptitude Test - 114
Hassan
1.Which among the following is the distributive law for the cross product of three vectors?
A. Px(Q+S) = (PxQ) + (PxS)
B. Px(QxS) = (PxQ) + (PxS)
C. Px(QxS) = (PxQ) x (PxS)
D. Px(Q+S) = (PxQ) + (PxS)
2.Which statement is true? (For three vectors P, Q and R)
A. Associative law for cross product: (PxQ)xS = Px(QxS)
B. Associative law for cross product: (PxQ)xS ? Px(QxS)
C. Associative law for cross product: (PxQ)xS > Px(QxS)
D. Associative law for cross product: (PxQ)xS = Px(QxS)
3.Which of the following is true?
A. i x i =1
B. j x i = -j
C. k x j = -i
D. i x i =1
4.Which of them is not correct?
A. j x j = 0
B. j x k = i
C. j x i = k
D. j x j = 0
5.The ___________ forces do not cause the rotation.
A. Non-concurrent
B. Concurrent
C. Parallel
D. Non-concurrent
6.In a four stage compressor, if the pressure at the first and third stage are 1 bar and 16 bar, then the delivery pressure at the fourth stage will be
A. 1 bar
B. 16 bar
C. 64 bar
D. 1 bar
7.The compressed air may be used
A. in gas turbine plants
B. for operating pneumatic drills
C. in starting and supercharging of I.C. engines
D. in gas turbine plants
8.A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
A. equal to
B. one-half
C. double
D. equal to
9.The volumetric efficiency for reciprocating air compressors is about
A. 10 to 40%
B. 40 to 60%
C. 60 to 70%
D. 10 to 40%
10.The maximum temperature in a gas turbine is
A. 200�C
B. 500�C
C. 700�C
D. 200�C
11.The stagnation pressure rise in a centrifugal compressor takes place
A. in the diffuser only
B. in the impeller only
C. in the diffuser and impeller
D. in the diffuser only
12.In a jet propulsion
A. the propulsive matter is ejected from within the propelled body
B. the propulsive matter is caused to flow around the propelled body
C. its functioning does not depend upon presence of air
D. the propulsive matter is ejected from within the propelled body
13.In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ___ of the piston.
A. one stroke
B. two strokes
C. three strokes
D. one stroke
14.The maximum delivery pressure in a rotary air compressor is
A. 10 bar
B. 20 bar
C. 30 bar
D. 10 bar
15.The capacity of a compressor is expressed in
A. kg/m2
B. kg/m3
C. m3/min
D. kg/m2
16.Intercooling in multi-stage compressors is done
A. to cool the air during compression
B. to cool the air at delivery
C. to enable compression in two stages
D. to cool the air during compression
17.The ratio of workdone per cycle to the stroke volume of the compressor is known as
A. compressor capacity
B. compression ratio
C. compressor efficiency
D. compressor capacity
18.The inlet pressure is always __________ the discharge pressure.
A. equal to
B. less than
C. more than
D. equal to
19.In the aircraft propellers
A. the propulsive matter is ejected from within the propelled body
B. the propulsive matter is caused to flow around the propelled body
C. its functioning does not depend upon the presence of air
D. the propulsive matter is ejected from within the propelled body
20.The type of rotary compressor used in gas turbines, is of
A. centrifugal type
B. axial flow type
C. radial flow type
D. centrifugal type
21.The volume of air delivered by the compressor is called
A. free air delivery
B. compressor capacity
C. swept volume
D. free air delivery
22.The efficiency of a jet engine is higher at
A. low speeds
B. high speeds
C. low altitudes
D. low speeds
23.In axial flow compressor, exit flow angle deviation from the blade angle is a function of
A. blade camber
B. blade camber and incidence angle
C. space-chord ratio
D. blade camber
24.Rotary compressors are used for delivering
A. small quantities of air at high pressures
B. large quantities of air at high pressures
C. small quantities of air at low pressures
D. small quantities of air at high pressures
25.A rotary compressor is driven by an
A. electric motor
B. engine
C. either (a) or (b)
D. electric motor
26.In a centrifugal compressor, an increase in speed at a given pressure ratio causes
A. increase in flow
B. decrease in flow
C. increase in efficiency
D. increase in flow
27.A large clearance Volume in a reciprocating compressor results in
A. reduced volume flow rate
B. increased volume flow rate
C. lower suction pressure
D. reduced volume flow rate
28.A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
A. same
B. lower
C. higher
D. same
29.Gas turbine as compared to steam turbine
A. requires less space for installation
B. has compressor and combustion chamber
C. has less efficiency
D. requires less space for installation
30.Intercooling in gas turbines
A. decreases net output but increases thermal efficiency
B. increases net output but decreases thermal efficiency
C. decreases net output and thermal efficiency both
D. decreases net output but increases thermal efficiency
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